leetcode

Leetcode solutions

Here ara some questions and my solutions mainly implemented by C/C++ from leetcode.

Almost all solutions can be found in discussion of each questions, and many valuable posts are really worth reading.

Reference

Some C++ knowledge websites: cppreference, cplusplus and GeeksforGeeks

Directory

id	area	title	Difficulty	Solution	Lock	Solved	RawID
1	cn us	Two Sum Two Sum	easy easy			✅	1
2	cn us	Add Two Numbers Add Two Numbers	medium medium			✅	2
3	cn us	Longest Substring Without Repeating Characters Longest Substring Without Repeating Characters	medium medium			✅	3
4	cn us	Median of Two Sorted Arrays Median of Two Sorted Arrays	hard hard			✅	4
5	cn us	Longest Palindromic Substring Longest Palindromic Substring	medium medium			✅	5
6	cn us	ZigZag Conversion ZigZag Conversion	medium medium			✅	6
7	cn us	Reverse Integer Reverse Integer	easy easy			✅	7
8	cn us	String to Integer (atoi) String to Integer (atoi)	medium medium			✅	8
9	cn us	Palindrome Number Palindrome Number	easy easy			✅	9
10	cn us	Regular Expression Matching Regular Expression Matching	hard hard			✅	10
11	cn us	Container With Most Water Container With Most Water	medium medium			✅	11
12	cn us	Integer to Roman Integer to Roman	medium medium			✅	12
13	cn us	Roman to Integer Roman to Integer	easy easy			✅	13
14	cn us	Longest Common Prefix Longest Common Prefix	easy easy			✅	14
15	cn us	3Sum 3Sum	medium medium			✅	15
16	cn us	3Sum Closest 3Sum Closest	medium medium			✅	16
17	cn us	Letter Combinations of a Phone Number Letter Combinations of a Phone Number	medium medium			✅	17
18	cn us	4Sum 4Sum	medium medium				18
19	cn us	Remove Nth Node From End of List Remove Nth Node From End of List	medium medium				19
20	cn us	Valid Parentheses Valid Parentheses	easy easy			✅	20
21	cn us	Merge Two Sorted Lists Merge Two Sorted Lists	easy easy			✅	21
22	cn us	Generate Parentheses Generate Parentheses	medium medium			✅	22
23	cn us	Merge k Sorted Lists Merge k Sorted Lists	hard hard			✅	23
24	cn us	Swap Nodes in Pairs Swap Nodes in Pairs	medium medium			✅	24
25	cn us	Reverse Nodes in k-Group Reverse Nodes in k-Group	hard hard				25
26	cn us	Remove Duplicates from Sorted Array Remove Duplicates from Sorted Array	easy easy			✅	26
27	cn us	Remove Element Remove Element	easy easy			✅	27
28	cn us	Implement strStr() Implement strStr()	easy easy			✅	28
29	cn us	Divide Two Integers Divide Two Integers	medium medium			✅	29
30	cn us	Substring with Concatenation of All Words Substring with Concatenation of All Words	hard hard				30
31	cn us	Next Permutation Next Permutation	medium medium			✅	31
32	cn us	Longest Valid Parentheses Longest Valid Parentheses	hard hard				32
33	cn us	Search in Rotated Sorted Array Search in Rotated Sorted Array	medium medium			✅	33
34	cn us	Find First and Last Position of Element in Sorted Array Find First and Last Position of Element in Sorted Array	medium medium			✅	34
35	cn us	Search Insert Position Search Insert Position	easy easy			✅	35
36	cn us	Valid Sudoku Valid Sudoku	medium medium			✅	36
37	cn us	Sudoku Solver Sudoku Solver	hard hard				37
38	cn us	Count and Say Count and Say	easy easy			✅	38
39	cn us	Combination Sum Combination Sum	medium medium			✅	39
40	cn us	Combination Sum II Combination Sum II	medium medium			✅	40
41	cn us	First Missing Positive First Missing Positive	hard hard			✅	41
42	cn us	Trapping Rain Water Trapping Rain Water	hard hard			✅	42
43	cn us	Multiply Strings Multiply Strings	medium medium				43
44	cn us	Wildcard Matching Wildcard Matching	hard hard				44
45	cn us	Jump Game II Jump Game II	hard hard			✅	45
46	cn us	Permutations Permutations	medium medium				46
47	cn us	Permutations II Permutations II	medium medium				47
48	cn us	Rotate Image Rotate Image	medium medium			✅	48
49	cn us	Group Anagrams Group Anagrams	medium medium				49
50	cn us	Pow(x, n) Pow(x, n)	medium medium			✅	50
51	cn us	N-Queens N-Queens	hard hard				51
52	cn us	N-Queens II N-Queens II	hard hard				52
53	cn us	Maximum Subarray Maximum Subarray	easy easy			✅	53
54	cn us	Spiral Matrix Spiral Matrix	medium medium			✅	54
55	cn us	Jump Game Jump Game	medium medium			✅	55
56	cn us	Merge Intervals Merge Intervals	medium medium			✅	56
57	cn us	Insert Interval Insert Interval	hard hard			✅	57
58	cn us	Length of Last Word Length of Last Word	easy easy				58
59	cn us	Spiral Matrix II Spiral Matrix II	medium medium				59
60	cn us	Permutation Sequence Permutation Sequence	medium medium				60
61	cn us	Rotate List Rotate List	medium medium				61
62	cn us	Unique Paths Unique Paths	medium medium			✅	62
63	cn us	Unique Paths II Unique Paths II	medium medium			✅	63
64	cn us	Minimum Path Sum Minimum Path Sum	medium medium			✅	64
65	cn us	Valid Number Valid Number	hard hard				65
66	cn us	Plus One Plus One	easy easy			✅	66
67	cn us	Add Binary Add Binary	easy easy				67
68	cn us	Text Justification Text Justification	hard hard				68
69	cn us	Sqrt(x) Sqrt(x)	easy easy			✅	69
70	cn us	Climbing Stairs Climbing Stairs	easy easy			✅	70
71	cn us	Simplify Path Simplify Path	medium medium			✅	71
72	cn us	Edit Distance Edit Distance	hard hard			✅	72
73	cn us	Set Matrix Zeroes Set Matrix Zeroes	medium medium				73
74	cn us	Search a 2D Matrix Search a 2D Matrix	medium medium			✅	74
75	cn us	Sort Colors Sort Colors	medium medium				75
76	cn us	Minimum Window Substring Minimum Window Substring	hard hard			✅	76
77	cn us	Combinations Combinations	medium medium				77
78	cn us	Subsets Subsets	medium medium			✅	78
79	cn us	Word Search Word Search	medium medium			✅	79
80	cn us	Remove Duplicates from Sorted Array II Remove Duplicates from Sorted Array II	medium medium				80
81	cn us	Search in Rotated Sorted Array II Search in Rotated Sorted Array II	medium medium			✅	81
82	cn us	Remove Duplicates from Sorted List II Remove Duplicates from Sorted List II	medium medium				82
83	cn us	Remove Duplicates from Sorted List Remove Duplicates from Sorted List	easy easy				83
84	cn us	Largest Rectangle in Histogram Largest Rectangle in Histogram	hard hard			✅	84
85	cn us	Maximal Rectangle Maximal Rectangle	hard hard			✅	85
86	cn us	Partition List Partition List	medium medium				86
87	cn us	Scramble String Scramble String	hard hard			✅	87
88	cn us	Merge Sorted Array Merge Sorted Array	easy easy			✅	88
89	cn us	Gray Code Gray Code	medium medium				89
90	cn us	Subsets II Subsets II	medium medium			✅	90
91	cn us	Decode Ways Decode Ways	medium medium			✅	91
92	cn us	Reverse Linked List II Reverse Linked List II	medium medium			✅	92
93	cn us	Restore IP Addresses Restore IP Addresses	medium medium				93
94	cn us	Binary Tree Inorder Traversal Binary Tree Inorder Traversal	medium medium			✅	94
95	cn us	Unique Binary Search Trees II Unique Binary Search Trees II	medium medium				95
96	cn us	Unique Binary Search Trees Unique Binary Search Trees	medium medium			✅	96
97	cn us	Interleaving String Interleaving String	hard hard			✅	97
98	cn us	Validate Binary Search Tree Validate Binary Search Tree	medium medium			✅	98
99	cn us	Recover Binary Search Tree Recover Binary Search Tree	hard hard				99
100	cn us	Same Tree Same Tree	easy easy				100
101	cn us	Symmetric Tree Symmetric Tree	easy easy			✅	101
102	cn us	Binary Tree Level Order Traversal Binary Tree Level Order Traversal	medium medium			✅	102
103	cn us	Binary Tree Zigzag Level Order Traversal Binary Tree Zigzag Level Order Traversal	medium medium			✅	103
104	cn us	Maximum Depth of Binary Tree Maximum Depth of Binary Tree	easy easy			✅	104
105	cn us	Construct Binary Tree from Preorder and Inorder Traversal Construct Binary Tree from Preorder and Inorder Traversal	medium medium				105
106	cn us	Construct Binary Tree from Inorder and Postorder Traversal Construct Binary Tree from Inorder and Postorder Traversal	medium medium				106
107	cn us	Binary Tree Level Order Traversal II Binary Tree Level Order Traversal II	easy easy				107
108	cn us	Convert Sorted Array to Binary Search Tree Convert Sorted Array to Binary Search Tree	easy easy			✅	108
109	cn us	Convert Sorted List to Binary Search Tree Convert Sorted List to Binary Search Tree	medium medium			✅	109
110	cn us	Balanced Binary Tree Balanced Binary Tree	easy easy			✅	110
111	cn us	Minimum Depth of Binary Tree Minimum Depth of Binary Tree	easy easy				111
112	cn us	Path Sum Path Sum	easy easy			✅	112
113	cn us	Path Sum II Path Sum II	medium medium			✅	113
114	cn us	Flatten Binary Tree to Linked List Flatten Binary Tree to Linked List	medium medium				114
115	cn us	Distinct Subsequences Distinct Subsequences	hard hard			✅	115
116	cn us	Populating Next Right Pointers in Each Node Populating Next Right Pointers in Each Node	medium medium				116
117	cn us	Populating Next Right Pointers in Each Node II Populating Next Right Pointers in Each Node II	medium medium				117
118	cn us	Pascal's Triangle Pascal's Triangle	easy easy			✅	118
119	cn us	Pascal's Triangle II Pascal's Triangle II	easy easy			✅	119
120	cn us	Triangle Triangle	medium medium			✅	120
121	cn us	Best Time to Buy and Sell Stock Best Time to Buy and Sell Stock	easy easy			✅	121
122	cn us	Best Time to Buy and Sell Stock II Best Time to Buy and Sell Stock II	easy easy			✅	122
123	cn us	Best Time to Buy and Sell Stock III Best Time to Buy and Sell Stock III	hard hard			✅	123
124	cn us	Binary Tree Maximum Path Sum Binary Tree Maximum Path Sum	hard hard			✅	124
125	cn us	Valid Palindrome Valid Palindrome	easy easy			✅	125
126	cn us	Word Ladder II Word Ladder II	hard hard				126
127	cn us	Word Ladder Word Ladder	medium medium			✅	127
128	cn us	Longest Consecutive Sequence Longest Consecutive Sequence	hard hard			✅	128
129	cn us	Sum Root to Leaf Numbers Sum Root to Leaf Numbers	medium medium				129
130	cn us	Surrounded Regions Surrounded Regions	medium medium			✅	130
131	cn us	Palindrome Partitioning Palindrome Partitioning	medium medium			✅	131
132	cn us	Palindrome Partitioning II Palindrome Partitioning II	hard hard			✅	132
133	cn us	Clone Graph Clone Graph	medium medium				133
134	cn us	Gas Station Gas Station	medium medium				134
135	cn us	Candy Candy	hard hard				135
136	cn us	Single Number Single Number	easy easy			✅	136
137	cn us	Single Number II Single Number II	medium medium				137
138	cn us	Copy List with Random Pointer Copy List with Random Pointer	medium medium				138
139	cn us	Word Break Word Break	medium medium			✅	139
140	cn us	Word Break II Word Break II	hard hard				140
141	cn us	Linked List Cycle Linked List Cycle	easy easy			✅	141
142	cn us	Linked List Cycle II Linked List Cycle II	medium medium			✅	142
143	cn us	Reorder List Reorder List	medium medium				143
144	cn us	Binary Tree Preorder Traversal Binary Tree Preorder Traversal	medium medium			✅	144
145	cn us	Binary Tree Postorder Traversal Binary Tree Postorder Traversal	hard hard				145
146	cn us	LRU Cache LRU Cache	medium medium			✅	146
147	cn us	Insertion Sort List Insertion Sort List	medium medium				147
148	cn us	Sort List Sort List	medium medium				148
149	cn us	Max Points on a Line Max Points on a Line	hard hard			✅	149
150	cn us	Evaluate Reverse Polish Notation Evaluate Reverse Polish Notation	medium medium				150
151	cn us	Reverse Words in a String Reverse Words in a String	medium medium			✅	151
152	cn us	Maximum Product Subarray Maximum Product Subarray	medium medium			✅	152
153	cn us	Find Minimum in Rotated Sorted Array Find Minimum in Rotated Sorted Array	medium medium			✅	153
154	cn us	Find Minimum in Rotated Sorted Array II Find Minimum in Rotated Sorted Array II	hard hard			✅	154
155	cn us	Min Stack Min Stack	easy easy				155
156	cn us	Binary Tree Upside Down Binary Tree Upside Down	medium medium		🔒 🔒		156
157	cn us	Read N Characters Given Read4 Read N Characters Given Read4	easy easy		🔒 🔒		157
158	cn us	Read N Characters Given Read4 II - Call multiple times Read N Characters Given Read4 II - Call multiple times	hard hard		🔒 🔒		158
159	cn us	Longest Substring with At Most Two Distinct Characters Longest Substring with At Most Two Distinct Characters	medium medium		🔒 🔒		159
160	cn us	Intersection of Two Linked Lists Intersection of Two Linked Lists	easy easy				160
161	cn us	One Edit Distance One Edit Distance	medium medium		🔒 🔒		161
162	cn us	Find Peak Element Find Peak Element	medium medium			✅	162
163	cn us	Missing Ranges Missing Ranges	medium medium		🔒 🔒		163
164	cn us	Maximum Gap Maximum Gap	hard hard				164
165	cn us	Compare Version Numbers Compare Version Numbers	medium medium				165
166	cn us	Fraction to Recurring Decimal Fraction to Recurring Decimal	medium medium				166
167	cn us	Two Sum II - Input array is sorted Two Sum II - Input array is sorted	easy easy			✅	167
168	cn us	Excel Sheet Column Title Excel Sheet Column Title	easy easy				168
169	cn us	Majority Element Majority Element	easy easy			✅	169
170	cn us	Two Sum III - Data structure design Two Sum III - Data structure design	easy easy		🔒 🔒		170
171	cn us	Excel Sheet Column Number Excel Sheet Column Number	easy easy				171
172	cn us	Factorial Trailing Zeroes Factorial Trailing Zeroes	easy easy				172
173	cn us	Binary Search Tree Iterator Binary Search Tree Iterator	medium medium			✅	173
174	cn us	Dungeon Game Dungeon Game	hard hard			✅	174
175	cn us	Combine Two Tables Combine Two Tables	easy easy				175
176	cn us	Second Highest Salary Second Highest Salary	easy easy				176
177	cn us	Nth Highest Salary Nth Highest Salary	medium medium				177
178	cn us	Rank Scores Rank Scores	medium medium				178
179	cn us	Largest Number Largest Number	medium medium				179
180	cn us	Consecutive Numbers Consecutive Numbers	medium medium				180
181	cn us	Employees Earning More Than Their Managers Employees Earning More Than Their Managers	easy easy				181
182	cn us	Duplicate Emails Duplicate Emails	easy easy				182
183	cn us	Customers Who Never Order Customers Who Never Order	easy easy				183
184	cn us	Department Highest Salary Department Highest Salary	medium medium				184
185	cn us	Department Top Three Salaries Department Top Three Salaries	hard hard				185
186	cn us	Reverse Words in a String II Reverse Words in a String II	medium medium		🔒 🔒		186
187	cn us	Repeated DNA Sequences Repeated DNA Sequences	medium medium				187
188	cn us	Best Time to Buy and Sell Stock IV Best Time to Buy and Sell Stock IV	hard hard			✅	188
189	cn us	Rotate Array Rotate Array	easy easy			✅	189
190	cn us	Reverse Bits Reverse Bits	easy easy				190
191	cn us	Number of 1 Bits Number of 1 Bits	easy easy			✅	191
192	cn us	Word Frequency Word Frequency	medium medium				192
193	cn us	Valid Phone Numbers Valid Phone Numbers	easy easy				193
194	cn us	Transpose File Transpose File	medium medium				194
195	cn us	Tenth Line Tenth Line	easy easy				195
196	cn us	Delete Duplicate Emails Delete Duplicate Emails	easy easy				196
197	cn us	Rising Temperature Rising Temperature	easy easy				197
198	cn us	House Robber House Robber	easy easy			✅	198
199	cn us	Binary Tree Right Side View Binary Tree Right Side View	medium medium				199
200	cn us	Number of Islands Number of Islands	medium medium			✅	200
201	cn us	Bitwise AND of Numbers Range Bitwise AND of Numbers Range	medium medium				201
202	cn us	Happy Number Happy Number	easy easy			✅	202
203	cn us	Remove Linked List Elements Remove Linked List Elements	easy easy				203
204	cn us	Count Primes Count Primes	easy easy			✅	204
205	cn us	Isomorphic Strings Isomorphic Strings	easy easy				205
206	cn us	Reverse Linked List Reverse Linked List	easy easy			✅	206
207	cn us	Course Schedule Course Schedule	medium medium			✅	207
208	cn us	Implement Trie (Prefix Tree) Implement Trie (Prefix Tree)	medium medium			✅	208
209	cn us	Minimum Size Subarray Sum Minimum Size Subarray Sum	medium medium			✅	209
210	cn us	Course Schedule II Course Schedule II	medium medium			✅	210
211	cn us	Add and Search Word - Data structure design Add and Search Word - Data structure design	medium medium			✅	211
212	cn us	Word Search II Word Search II	hard hard			✅	212
213	cn us	House Robber II House Robber II	medium medium			✅	213
214	cn us	Shortest Palindrome Shortest Palindrome	hard hard				214
215	cn us	Kth Largest Element in an Array Kth Largest Element in an Array	medium medium			✅	215
216	cn us	Combination Sum III Combination Sum III	medium medium				216
217	cn us	Contains Duplicate Contains Duplicate	easy easy			✅	217
218	cn us	The Skyline Problem The Skyline Problem	hard hard				218
219	cn us	Contains Duplicate II Contains Duplicate II	easy easy				219
220	cn us	Contains Duplicate III Contains Duplicate III	medium medium				220
221	cn us	Maximal Square Maximal Square	medium medium				221
222	cn us	Count Complete Tree Nodes Count Complete Tree Nodes	medium medium			✅	222
223	cn us	Rectangle Area Rectangle Area	medium medium				223
224	cn us	Basic Calculator Basic Calculator	hard hard			✅	224
225	cn us	Implement Stack using Queues Implement Stack using Queues	easy easy			✅	225
226	cn us	Invert Binary Tree Invert Binary Tree	easy easy				226
227	cn us	Basic Calculator II Basic Calculator II	medium medium				227
228	cn us	Summary Ranges Summary Ranges	medium medium			✅	228
229	cn us	Majority Element II Majority Element II	medium medium			✅	229
230	cn us	Kth Smallest Element in a BST Kth Smallest Element in a BST	medium medium			✅	230
231	cn us	Power of Two Power of Two	easy easy				231
232	cn us	Implement Queue using Stacks Implement Queue using Stacks	easy easy				232
233	cn us	Number of Digit One Number of Digit One	hard hard				233
234	cn us	Palindrome Linked List Palindrome Linked List	easy easy				234
235	cn us	Lowest Common Ancestor of a Binary Search Tree Lowest Common Ancestor of a Binary Search Tree	easy easy				235
236	cn us	Lowest Common Ancestor of a Binary Tree Lowest Common Ancestor of a Binary Tree	medium medium				236
237	cn us	Delete Node in a Linked List Delete Node in a Linked List	easy easy			✅	237
238	cn us	Product of Array Except Self Product of Array Except Self	medium medium			✅	238
239	cn us	Sliding Window Maximum Sliding Window Maximum	hard hard			✅	239
240	cn us	Search a 2D Matrix II Search a 2D Matrix II	medium medium			✅	240
241	cn us	Different Ways to Add Parentheses Different Ways to Add Parentheses	medium medium				241
242	cn us	Valid Anagram Valid Anagram	easy easy			✅	242
243	cn us	Shortest Word Distance Shortest Word Distance	easy easy		🔒 🔒		243
244	cn us	Shortest Word Distance II Shortest Word Distance II	medium medium		🔒 🔒		244
245	cn us	Shortest Word Distance III Shortest Word Distance III	medium medium		🔒 🔒		245
246	cn us	Strobogrammatic Number Strobogrammatic Number	easy easy		🔒 🔒		246
247	cn us	Strobogrammatic Number II Strobogrammatic Number II	medium medium		🔒 🔒		247
248	cn us	Strobogrammatic Number III Strobogrammatic Number III	hard hard		🔒 🔒		248
249	cn us	Group Shifted Strings Group Shifted Strings	medium medium		🔒 🔒		249
250	cn us	Count Univalue Subtrees Count Univalue Subtrees	medium medium		🔒 🔒		250
251	cn us	Flatten 2D Vector Flatten 2D Vector	medium medium		🔒 🔒		251
252	cn us	Meeting Rooms Meeting Rooms	easy easy		🔒 🔒		252
253	cn us	Meeting Rooms II Meeting Rooms II	medium medium		🔒 🔒		253
254	cn us	Factor Combinations Factor Combinations	medium medium		🔒 🔒		254
255	cn us	Verify Preorder Sequence in Binary Search Tree Verify Preorder Sequence in Binary Search Tree	medium medium		🔒 🔒		255
256	cn us	Paint House Paint House	easy easy		🔒 🔒		256
257	cn us	Binary Tree Paths Binary Tree Paths	easy easy				257
258	cn us	Add Digits Add Digits	easy easy				258
259	cn us	3Sum Smaller 3Sum Smaller	medium medium		🔒 🔒		259
260	cn us	Single Number III Single Number III	medium medium				260
261	cn us	Graph Valid Tree Graph Valid Tree	medium medium		🔒 🔒		261
262	cn us	Trips and Users Trips and Users	hard hard				262
263	cn us	Ugly Number Ugly Number	easy easy			✅	263
264	cn us	Ugly Number II Ugly Number II	medium medium			✅	264
265	cn us	Paint House II Paint House II	hard hard		🔒 🔒		265
266	cn us	Palindrome Permutation Palindrome Permutation	easy easy		🔒 🔒		266
267	cn us	Palindrome Permutation II Palindrome Permutation II	medium medium		🔒 🔒		267
268	cn us	Missing Number Missing Number	easy easy			✅	268
269	cn us	Alien Dictionary Alien Dictionary	hard hard		🔒 🔒		269
270	cn us	Closest Binary Search Tree Value Closest Binary Search Tree Value	easy easy		🔒 🔒		270
271	cn us	Encode and Decode Strings Encode and Decode Strings	medium medium		🔒 🔒		271
272	cn us	Closest Binary Search Tree Value II Closest Binary Search Tree Value II	hard hard		🔒 🔒		272
273	cn us	Integer to English Words Integer to English Words	hard hard				273
274	cn us	H-Index H-Index	medium medium			✅	274
275	cn us	H-Index II H-Index II	medium medium			✅	275
276	cn us	Paint Fence Paint Fence	easy easy		🔒 🔒		276
277	cn us	Find the Celebrity Find the Celebrity	medium medium		🔒 🔒		277
278	cn us	First Bad Version First Bad Version	easy easy			✅	278
279	cn us	Perfect Squares Perfect Squares	medium medium			✅	279
280	cn us	Wiggle Sort Wiggle Sort	medium medium		🔒 🔒		280
281	cn us	Zigzag Iterator Zigzag Iterator	medium medium		🔒 🔒		281
282	cn us	Expression Add Operators Expression Add Operators	hard hard				282
283	cn us	Move Zeroes Move Zeroes	easy easy			✅	283
284	cn us	Peeking Iterator Peeking Iterator	medium medium				284
285	cn us	Inorder Successor in BST Inorder Successor in BST	medium medium		🔒 🔒		285
286	cn us	Walls and Gates Walls and Gates	medium medium		🔒 🔒		286
287	cn us	Find the Duplicate Number Find the Duplicate Number	medium medium			✅	287
288	cn us	Unique Word Abbreviation Unique Word Abbreviation	medium medium		🔒 🔒		288
289	cn us	Game of Life Game of Life	medium medium			✅	289
290	cn us	Word Pattern Word Pattern	easy easy				290
291	cn us	Word Pattern II Word Pattern II	hard hard		🔒 🔒		291
292	cn us	Nim Game Nim Game	easy easy				292
293	cn us	Flip Game Flip Game	easy easy		🔒 🔒		293
294	cn us	Flip Game II Flip Game II	medium medium		🔒 🔒		294
295	cn us	Find Median from Data Stream Find Median from Data Stream	hard hard				295
296	cn us	Best Meeting Point Best Meeting Point	hard hard		🔒 🔒		296
297	cn us	Serialize and Deserialize Binary Tree Serialize and Deserialize Binary Tree	hard hard				297
298	cn us	Binary Tree Longest Consecutive Sequence Binary Tree Longest Consecutive Sequence	medium medium		🔒 🔒		298
299	cn us	Bulls and Cows Bulls and Cows	easy easy				299
300	cn us	Longest Increasing Subsequence Longest Increasing Subsequence	medium medium			✅	300
301	cn us	Remove Invalid Parentheses Remove Invalid Parentheses	hard hard				301
302	cn us	Smallest Rectangle Enclosing Black Pixels Smallest Rectangle Enclosing Black Pixels	hard hard		🔒 🔒		302
303	cn us	Range Sum Query - Immutable Range Sum Query - Immutable	easy easy			✅	303
304	cn us	Range Sum Query 2D - Immutable Range Sum Query 2D - Immutable	medium medium				304
305	cn us	Number of Islands II Number of Islands II	hard hard		🔒 🔒		305
306	cn us	Additive Number Additive Number	medium medium				306
307	cn us	Range Sum Query - Mutable Range Sum Query - Mutable	medium medium			✅	307
308	cn us	Range Sum Query 2D - Mutable Range Sum Query 2D - Mutable	hard hard		🔒 🔒		308
309	cn us	Best Time to Buy and Sell Stock with Cooldown Best Time to Buy and Sell Stock with Cooldown	medium medium			✅	309
310	cn us	Minimum Height Trees Minimum Height Trees	medium medium				310
311	cn us	Sparse Matrix Multiplication Sparse Matrix Multiplication	medium medium		🔒 🔒		311
312	cn us	Burst Balloons Burst Balloons	hard hard			✅	312
313	cn us	Super Ugly Number Super Ugly Number	medium medium			✅	313
314	cn us	Binary Tree Vertical Order Traversal Binary Tree Vertical Order Traversal	medium medium		🔒 🔒		314
315	cn us	Count of Smaller Numbers After Self Count of Smaller Numbers After Self	hard hard				315
316	cn us	Remove Duplicate Letters Remove Duplicate Letters	hard hard			✅	316
317	cn us	Shortest Distance from All Buildings Shortest Distance from All Buildings	hard hard		🔒 🔒		317
318	cn us	Maximum Product of Word Lengths Maximum Product of Word Lengths	medium medium			✅	318
319	cn us	Bulb Switcher Bulb Switcher	medium medium				319
320	cn us	Generalized Abbreviation Generalized Abbreviation	medium medium		🔒 🔒		320
321	cn us	Create Maximum Number Create Maximum Number	hard hard				321
322	cn us	Coin Change Coin Change	medium medium			✅	322
323	cn us	Number of Connected Components in an Undirected Graph Number of Connected Components in an Undirected Graph	medium medium		🔒 🔒		323
324	cn us	Wiggle Sort II Wiggle Sort II	medium medium				324
325	cn us	Maximum Size Subarray Sum Equals k Maximum Size Subarray Sum Equals k	medium medium		🔒 🔒		325
326	cn us	Power of Three Power of Three	easy easy				326
327	cn us	Count of Range Sum Count of Range Sum	hard hard			✅	327
328	cn us	Odd Even Linked List Odd Even Linked List	medium medium			✅	328
329	cn us	Longest Increasing Path in a Matrix Longest Increasing Path in a Matrix	hard hard			✅	329
330	cn us	Patching Array Patching Array	hard hard			✅	330
331	cn us	Verify Preorder Serialization of a Binary Tree Verify Preorder Serialization of a Binary Tree	medium medium				331
332	cn us	Reconstruct Itinerary Reconstruct Itinerary	medium medium				332
333	cn us	Largest BST Subtree Largest BST Subtree	medium medium		🔒 🔒		333
334	cn us	Increasing Triplet Subsequence Increasing Triplet Subsequence	medium medium				334
335	cn us	Self Crossing Self Crossing	hard hard			✅	335
336	cn us	Palindrome Pairs Palindrome Pairs	hard hard				336
337	cn us	House Robber III House Robber III	medium medium				337
338	cn us	Counting Bits Counting Bits	medium medium			✅	338
339	cn us	Nested List Weight Sum Nested List Weight Sum	easy easy		🔒 🔒		339
340	cn us	Longest Substring with At Most K Distinct Characters Longest Substring with At Most K Distinct Characters	hard hard		🔒 🔒		340
341	cn us	Flatten Nested List Iterator Flatten Nested List Iterator	medium medium			❌	341
342	cn us	Power of Four Power of Four	easy easy				342
343	cn us	Integer Break Integer Break	medium medium			✅	343
344	cn us	Reverse String Reverse String	easy easy			✅	344
345	cn us	Reverse Vowels of a String Reverse Vowels of a String	easy easy				345
346	cn us	Moving Average from Data Stream Moving Average from Data Stream	easy easy		🔒 🔒		346
347	cn us	Top K Frequent Elements Top K Frequent Elements	medium medium			✅	347
348	cn us	Design Tic-Tac-Toe Design Tic-Tac-Toe	medium medium		🔒 🔒		348
349	cn us	Intersection of Two Arrays Intersection of Two Arrays	easy easy			✅	349
350	cn us	Intersection of Two Arrays II Intersection of Two Arrays II	easy easy			✅	350
351	cn us	Android Unlock Patterns Android Unlock Patterns	medium medium		🔒 🔒		351
352	cn us	Data Stream as Disjoint Intervals Data Stream as Disjoint Intervals	hard hard				352
353	cn us	Design Snake Game Design Snake Game	medium medium		🔒 🔒		353
354	cn us	Russian Doll Envelopes Russian Doll Envelopes	hard hard			✅	354
355	cn us	Design Twitter Design Twitter	medium medium			✅	355
356	cn us	Line Reflection Line Reflection	medium medium		🔒 🔒		356
357	cn us	Count Numbers with Unique Digits Count Numbers with Unique Digits	medium medium			✅	357
358	cn us	Rearrange String k Distance Apart Rearrange String k Distance Apart	hard hard		🔒 🔒		358
359	cn us	Logger Rate Limiter Logger Rate Limiter	easy easy		🔒 🔒		359
360	cn us	Sort Transformed Array Sort Transformed Array	medium medium		🔒 🔒		360
361	cn us	Bomb Enemy Bomb Enemy	medium medium		🔒 🔒		361
362	cn us	Design Hit Counter Design Hit Counter	medium medium		🔒 🔒		362
363	cn us	Max Sum of Rectangle No Larger Than K Max Sum of Rectangle No Larger Than K	hard hard			✅	363
364	cn us	Nested List Weight Sum II Nested List Weight Sum II	medium medium		🔒 🔒		364
365	cn us	Water and Jug Problem Water and Jug Problem	medium medium			✅	365
366	cn us	Find Leaves of Binary Tree Find Leaves of Binary Tree	medium medium		🔒 🔒		366
367	cn us	Valid Perfect Square Valid Perfect Square	easy easy			✅	367
368	cn us	Largest Divisible Subset Largest Divisible Subset	medium medium				368
369	cn us	Plus One Linked List Plus One Linked List	medium medium		🔒 🔒		369
370	cn us	Range Addition Range Addition	medium medium		🔒 🔒		370
371	cn us	Sum of Two Integers Sum of Two Integers	easy easy			✅	371
372	cn us	Super Pow Super Pow	medium medium				372
373	cn us	Find K Pairs with Smallest Sums Find K Pairs with Smallest Sums	medium medium				373
374	cn us	Guess Number Higher or Lower Guess Number Higher or Lower	easy easy			✅	374
375	cn us	Guess Number Higher or Lower II Guess Number Higher or Lower II	medium medium			✅	375
376	cn us	Wiggle Subsequence Wiggle Subsequence	medium medium			✅	376
377	cn us	Combination Sum IV Combination Sum IV	medium medium			✅	377
378	cn us	Kth Smallest Element in a Sorted Matrix Kth Smallest Element in a Sorted Matrix	medium medium			✅	378
379	cn us	Design Phone Directory Design Phone Directory	medium medium		🔒 🔒		379
380	cn us	Insert Delete GetRandom O(1) Insert Delete GetRandom O(1)	medium medium			✅	380
381	cn us	Insert Delete GetRandom O(1) - Duplicates allowed Insert Delete GetRandom O(1) - Duplicates allowed	hard hard				381
382	cn us	Linked List Random Node Linked List Random Node	medium medium				382
383	cn us	Ransom Note Ransom Note	easy easy				383
384	cn us	Shuffle an Array Shuffle an Array	medium medium				384
385	cn us	Mini Parser Mini Parser	medium medium				385
386	cn us	Lexicographical Numbers Lexicographical Numbers	medium medium			✅	386
387	cn us	First Unique Character in a String First Unique Character in a String	easy easy			✅	387
388	cn us	Longest Absolute File Path Longest Absolute File Path	medium medium			✅	388
389	cn us	Find the Difference Find the Difference	easy easy				389
390	cn us	Elimination Game Elimination Game	medium medium				390
391	cn us	Perfect Rectangle Perfect Rectangle	hard hard				391
392	cn us	Is Subsequence Is Subsequence	easy easy			✅	392
393	cn us	UTF-8 Validation UTF-8 Validation	medium medium			✅	393
394	cn us	Decode String Decode String	medium medium			✅	394
395	cn us	Longest Substring with At Least K Repeating Characters Longest Substring with At Least K Repeating Characters	medium medium				395
396	cn us	Rotate Function Rotate Function	medium medium				396
397	cn us	Integer Replacement Integer Replacement	medium medium				397
398	cn us	Random Pick Index Random Pick Index	medium medium			✅	398
399	cn us	Evaluate Division Evaluate Division	medium medium			✅	399
400	cn us	Nth Digit Nth Digit	medium medium				400
401	cn us	Binary Watch Binary Watch	easy easy				401
402	cn us	Remove K Digits Remove K Digits	medium medium				402
403	cn us	Frog Jump Frog Jump	hard hard				403
404	cn us	Sum of Left Leaves Sum of Left Leaves	easy easy				404
405	cn us	Convert a Number to Hexadecimal Convert a Number to Hexadecimal	easy easy				405
406	cn us	Queue Reconstruction by Height Queue Reconstruction by Height	medium medium				406
407	cn us	Trapping Rain Water II Trapping Rain Water II	hard hard				407
408	cn us	Valid Word Abbreviation Valid Word Abbreviation	easy easy		🔒 🔒		408
409	cn us	Longest Palindrome Longest Palindrome	easy easy			✅	409
410	cn us	Split Array Largest Sum Split Array Largest Sum	hard hard			✅	410
411	cn us	Minimum Unique Word Abbreviation Minimum Unique Word Abbreviation	hard hard		🔒 🔒		411
412	cn us	Fizz Buzz Fizz Buzz	easy easy				412
413	cn us	Arithmetic Slices Arithmetic Slices	medium medium			✅	413
414	cn us	Third Maximum Number Third Maximum Number	easy easy			✅	414
415	cn us	Add Strings Add Strings	easy easy			✅	415
416	cn us	Partition Equal Subset Sum Partition Equal Subset Sum	medium medium			✅	416
417	cn us	Pacific Atlantic Water Flow Pacific Atlantic Water Flow	medium medium			✅	417
418	cn us	Sentence Screen Fitting Sentence Screen Fitting	medium medium		🔒 🔒		418
419	cn us	Battleships in a Board Battleships in a Board	medium medium				419
420	cn us	Strong Password Checker Strong Password Checker	hard hard				420
421	cn us	Maximum XOR of Two Numbers in an Array Maximum XOR of Two Numbers in an Array	medium medium				421
422	cn us	Valid Word Square Valid Word Square	easy easy		🔒 🔒		422
423	cn us	Reconstruct Original Digits from English Reconstruct Original Digits from English	medium medium				423
424	cn us	Longest Repeating Character Replacement Longest Repeating Character Replacement	medium medium				424
425	cn us	Word Squares Word Squares	hard hard		🔒 🔒		425
432	cn us	All Oone Data Structure](https://leetcode-cn.com/problems/all-oone-data-structure/description/)<br>[All Oone Data Structure	hard hard			❌	432
433	cn us	Minimum Genetic Mutation Minimum Genetic Mutation	medium medium				433
434	cn us	Number of Segments in a String Number of Segments in a String	easy easy			✅	434
435	cn us	Non-overlapping Intervals Non-overlapping Intervals	medium medium				435
436	cn us	Find Right Interval Find Right Interval	medium medium			✅	436
437	cn us	Path Sum III Path Sum III	easy easy			✅	437
438	cn us	Find All Anagrams in a String Find All Anagrams in a String	medium medium				438
439	cn us	Ternary Expression Parser Ternary Expression Parser	medium medium		🔒 🔒		439
440	cn us	K-th Smallest in Lexicographical Order K-th Smallest in Lexicographical Order	hard hard				440
441	cn us	Arranging Coins Arranging Coins	easy easy			✅	441
442	cn us	Find All Duplicates in an Array Find All Duplicates in an Array	medium medium			✅	442
443	cn us	String Compression String Compression	easy easy				443
444	cn us	Sequence Reconstruction Sequence Reconstruction	medium medium		🔒 🔒		444
445	cn us	Add Two Numbers II Add Two Numbers II	medium medium				445
446	cn us	Arithmetic Slices II - Subsequence Arithmetic Slices II - Subsequence	hard hard			✅	446
447	cn us	Number of Boomerangs Number of Boomerangs	easy easy				447
448	cn us	Find All Numbers Disappeared in an Array Find All Numbers Disappeared in an Array	easy easy			✅	448
449	cn us	Serialize and Deserialize BST Serialize and Deserialize BST	medium medium			✅	449
450	cn us	Delete Node in a BST Delete Node in a BST	medium medium			✅	450
451	cn us	Sort Characters By Frequency Sort Characters By Frequency	medium medium			✅	451
452	cn us	Minimum Number of Arrows to Burst Balloons Minimum Number of Arrows to Burst Balloons	medium medium				452
453	cn us	Minimum Moves to Equal Array Elements Minimum Moves to Equal Array Elements	easy easy				453
454	cn us	4Sum II 4Sum II	medium medium			✅	454
455	cn us	Assign Cookies Assign Cookies	easy easy				455
456	cn us	132 Pattern 132 Pattern	medium medium			✅	456
457	cn us	Circular Array Loop Circular Array Loop	medium medium				457
458	cn us	Poor Pigs Poor Pigs	hard hard			✅	458
459	cn us	Repeated Substring Pattern Repeated Substring Pattern	easy easy				459
460	cn us	LFU Cache LFU Cache	hard hard			✅	460
461	cn us	Hamming Distance Hamming Distance	easy easy			✅	461
462	cn us	Minimum Moves to Equal Array Elements II Minimum Moves to Equal Array Elements II	medium medium				462
463	cn us	Island Perimeter Island Perimeter	easy easy				463
464	cn us	Can I Win Can I Win	medium medium				464
465	cn us	Optimal Account Balancing Optimal Account Balancing	hard hard		🔒 🔒		465
466	cn us	Count The Repetitions Count The Repetitions	hard hard				466
467	cn us	Unique Substrings in Wraparound String Unique Substrings in Wraparound String	medium medium				467
468	cn us	Validate IP Address Validate IP Address	medium medium				468
469	cn us	Convex Polygon Convex Polygon	medium medium		🔒 🔒		469
471	cn us	Encode String with Shortest Length Encode String with Shortest Length	hard hard		🔒 🔒		471
472	cn us	Concatenated Words Concatenated Words	hard hard				472
473	cn us	Matchsticks to Square Matchsticks to Square	medium medium				473
474	cn us	Ones and Zeroes Ones and Zeroes	medium medium			✅	474
475	cn us	Heaters Heaters	easy easy			✅	475
476	cn us	Number Complement Number Complement	easy easy			✅	476
477	cn us	Total Hamming Distance Total Hamming Distance	medium medium				477
479	cn us	Largest Palindrome Product Largest Palindrome Product	hard hard				479
480	cn us	Sliding Window Median Sliding Window Median	hard hard				480
481	cn us	Magical String Magical String	medium medium			✅	481
482	cn us	License Key Formatting License Key Formatting	easy easy			✅	482
483	cn us	Smallest Good Base Smallest Good Base	hard hard			✅	483
484	cn us	Find Permutation Find Permutation	medium medium		🔒 🔒		484
485	cn us	Max Consecutive Ones Max Consecutive Ones	easy easy			✅	485
486	cn us	Predict the Winner Predict the Winner	medium medium			✅	486
487	cn us	Max Consecutive Ones II Max Consecutive Ones II	medium medium		🔒 🔒		487
488	cn us	Zuma Game Zuma Game	hard hard				488
490	cn us	The Maze The Maze	medium medium		🔒 🔒		490
491	cn us	Increasing Subsequences Increasing Subsequences	medium medium				491
492	cn us	Construct the Rectangle Construct the Rectangle	easy easy				492
493	cn us	Reverse Pairs Reverse Pairs	hard hard			✅	493
494	cn us	Target Sum Target Sum	medium medium			✅	494
495	cn us	Teemo Attacking Teemo Attacking	medium medium			✅	495
496	cn us	Next Greater Element I Next Greater Element I	easy easy			✅	496
498	cn us	Diagonal Traverse Diagonal Traverse	medium medium			✅	498
499	cn us	The Maze III The Maze III	hard hard		🔒 🔒		499
500	cn us	Keyboard Row Keyboard Row	easy easy			✅	500
501	cn us	Find Mode in Binary Search Tree Find Mode in Binary Search Tree	easy easy				501
502	cn us	IPO IPO	hard hard				502
503	cn us	Next Greater Element II Next Greater Element II	medium medium			✅	503
504	cn us	Base 7 Base 7	easy easy				504
505	cn us	The Maze II The Maze II	medium medium		🔒 🔒		505
506	cn us	Relative Ranks Relative Ranks	easy easy			✅	506
507	cn us	Perfect Number Perfect Number	easy easy			✅	507
508	cn us	Most Frequent Subtree Sum Most Frequent Subtree Sum	medium medium				508
510	cn us	Inorder Successor in BST II Inorder Successor in BST II	medium medium		🔒 🔒		509
1059	cn us	All Paths from Source Lead to Destination All Paths from Source Lead to Destination	medium medium		🔒 🔒		511
513	cn us	Find Bottom Left Tree Value Find Bottom Left Tree Value	medium medium			✅	513
514	cn us	Freedom Trail Freedom Trail	hard hard			✅	514
515	cn us	Find Largest Value in Each Tree Row Find Largest Value in Each Tree Row	medium medium				515
516	cn us	Longest Palindromic Subsequence Longest Palindromic Subsequence	medium medium			✅	516
517	cn us	Super Washing Machines Super Washing Machines	hard hard				517
518	cn us	Coin Change 2 Coin Change 2	medium medium				518
520	cn us	Detect Capital Detect Capital	easy easy			✅	520
521	cn us	Longest Uncommon Subsequence I Longest Uncommon Subsequence I	easy easy			✅	521
522	cn us	Longest Uncommon Subsequence II Longest Uncommon Subsequence II	medium medium			✅	522
523	cn us	Continuous Subarray Sum Continuous Subarray Sum	medium medium			✅	523
524	cn us	Longest Word in Dictionary through Deleting Longest Word in Dictionary through Deleting	medium medium			✅	524
525	cn us	Contiguous Array Contiguous Array	medium medium				525
526	cn us	Beautiful Arrangement Beautiful Arrangement	medium medium			✅	526
527	cn us	Word Abbreviation Word Abbreviation	hard hard		🔒 🔒		527
529	cn us	Minesweeper Minesweeper	medium medium			✅	529
530	cn us	Minimum Absolute Difference in BST Minimum Absolute Difference in BST	easy easy				530
531	cn us	Lonely Pixel I Lonely Pixel I	medium medium		🔒 🔒		531
532	cn us	K-diff Pairs in an Array K-diff Pairs in an Array	easy easy			✅	532
533	cn us	Lonely Pixel II Lonely Pixel II	medium medium		🔒 🔒		533
535	cn us	Encode and Decode TinyURL Encode and Decode TinyURL	medium medium			✅	535
536	cn us	Construct Binary Tree from String Construct Binary Tree from String	medium medium		🔒 🔒		536
537	cn us	Complex Number Multiplication Complex Number Multiplication	medium medium				537
538	cn us	Convert BST to Greater Tree Convert BST to Greater Tree	easy easy			✅	538
539	cn us	Minimum Time Difference Minimum Time Difference	medium medium				539
540	cn us	Single Element in a Sorted Array Single Element in a Sorted Array	medium medium				540
541	cn us	Reverse String II Reverse String II	easy easy			✅	541
542	cn us	01 Matrix 01 Matrix	medium medium			✅	542
543	cn us	Diameter of Binary Tree Diameter of Binary Tree	easy easy			✅	543
544	cn us	Output Contest Matches Output Contest Matches	medium medium		🔒 🔒		544
545	cn us	Boundary of Binary Tree Boundary of Binary Tree	medium medium		🔒 🔒		545
546	cn us	Remove Boxes Remove Boxes	hard hard				546
547	cn us	Friend Circles Friend Circles	medium medium				547
548	cn us	Split Array with Equal Sum Split Array with Equal Sum	medium medium		🔒 🔒		548
549	cn us	Binary Tree Longest Consecutive Sequence II Binary Tree Longest Consecutive Sequence II	medium medium		🔒 🔒		549
551	cn us	Student Attendance Record I Student Attendance Record I	easy easy			✅	551
552	cn us	Student Attendance Record II Student Attendance Record II	hard hard			✅	552
553	cn us	Optimal Division Optimal Division	medium medium				553
554	cn us	Brick Wall Brick Wall	medium medium				554
555	cn us	Split Concatenated Strings Split Concatenated Strings	medium medium		🔒 🔒		555
556	cn us	Next Greater Element III Next Greater Element III	medium medium			✅	556
557	cn us	Reverse Words in a String III Reverse Words in a String III	easy easy				557
560	cn us	Subarray Sum Equals K Subarray Sum Equals K	medium medium			✅	560
561	cn us	Array Partition I Array Partition I	easy easy			✅	561
562	cn us	Longest Line of Consecutive One in Matrix Longest Line of Consecutive One in Matrix	medium medium		🔒 🔒		562
563	cn us	Binary Tree Tilt Binary Tree Tilt	easy easy				563
564	cn us	Find the Closest Palindrome Find the Closest Palindrome	hard hard				564
565	cn us	Array Nesting Array Nesting	medium medium			✅	565
566	cn us	Reshape the Matrix Reshape the Matrix	easy easy			✅	566
567	cn us	Permutation in String Permutation in String	medium medium				567
568	cn us	Maximum Vacation Days Maximum Vacation Days	hard hard		🔒 🔒		568
569	cn us	Median Employee Salary Median Employee Salary	hard hard		🔒 🔒		569
570	cn us	Managers with at Least 5 Direct Reports Managers with at Least 5 Direct Reports	medium medium		🔒 🔒		570
571	cn us	Find Median Given Frequency of Numbers Find Median Given Frequency of Numbers	hard hard		🔒 🔒		571
572	cn us	Subtree of Another Tree Subtree of Another Tree	easy easy				572
573	cn us	Squirrel Simulation Squirrel Simulation	medium medium		🔒 🔒		573
574	cn us	Winning Candidate Winning Candidate	medium medium		🔒 🔒		574
575	cn us	Distribute Candies Distribute Candies	easy easy			✅	575
576	cn us	Out of Boundary Paths Out of Boundary Paths	medium medium				576
577	cn us	Employee Bonus Employee Bonus	easy easy		🔒 🔒		577
578	cn us	Get Highest Answer Rate Question Get Highest Answer Rate Question	medium medium		🔒 🔒		578
579	cn us	Find Cumulative Salary of an Employee Find Cumulative Salary of an Employee	hard hard		🔒 🔒		579
580	cn us	Count Student Number in Departments Count Student Number in Departments	medium medium		🔒 🔒		580
581	cn us	Shortest Unsorted Continuous Subarray Shortest Unsorted Continuous Subarray	easy easy			✅	581
582	cn us	Kill Process Kill Process	medium medium		🔒 🔒		582
583	cn us	Delete Operation for Two Strings Delete Operation for Two Strings	medium medium			✅	583
584	cn us	Find Customer Referee Find Customer Referee	easy easy		🔒 🔒		584
585	cn us	Investments in 2016 Investments in 2016	medium medium		🔒 🔒		585
586	cn us	Customer Placing the Largest Number of Orders Customer Placing the Largest Number of Orders	easy easy		🔒 🔒		586
587	cn us	Erect the Fence Erect the Fence	hard hard				587
588	cn us	Design In-Memory File System Design In-Memory File System	hard hard		🔒 🔒		588
591	cn us	Tag Validator Tag Validator	hard hard				591
592	cn us	Fraction Addition and Subtraction Fraction Addition and Subtraction	medium medium				592
593	cn us	Valid Square Valid Square	medium medium				593
594	cn us	Longest Harmonious Subsequence Longest Harmonious Subsequence	easy easy				594
595	cn us	Big Countries Big Countries	easy easy				595
596	cn us	Classes More Than 5 Students Classes More Than 5 Students	easy easy				596
597	cn us	Friend Requests I: Overall Acceptance Rate Friend Requests I: Overall Acceptance Rate	easy easy		🔒 🔒		597
598	cn us	Range Addition II Range Addition II	easy easy				598
599	cn us	Minimum Index Sum of Two Lists Minimum Index Sum of Two Lists	easy easy				599
600	cn us	Non-negative Integers without Consecutive Ones Non-negative Integers without Consecutive Ones	hard hard				600
601	cn us	Human Traffic of Stadium Human Traffic of Stadium	hard hard				601
602	cn us	Friend Requests II: Who Has the Most Friends Friend Requests II: Who Has the Most Friends	medium medium		🔒 🔒		602
603	cn us	Consecutive Available Seats Consecutive Available Seats	easy easy		🔒 🔒		603
604	cn us	Design Compressed String Iterator Design Compressed String Iterator	easy easy		🔒 🔒		604
605	cn us	Can Place Flowers Can Place Flowers	easy easy			✅	605
606	cn us	Construct String from Binary Tree Construct String from Binary Tree	easy easy			✅	606
607	cn us	Sales Person Sales Person	easy easy		🔒 🔒		607
608	cn us	Tree Node Tree Node	medium medium		🔒 🔒		608
609	cn us	Find Duplicate File in System Find Duplicate File in System	medium medium				609
610	cn us	Triangle Judgement Triangle Judgement	easy easy		🔒 🔒		610
611	cn us	Valid Triangle Number Valid Triangle Number	medium medium				611
612	cn us	Shortest Distance in a Plane Shortest Distance in a Plane	medium medium		🔒 🔒		612
613	cn us	Shortest Distance in a Line Shortest Distance in a Line	easy easy		🔒 🔒		613
614	cn us	Second Degree Follower Second Degree Follower	medium medium		🔒 🔒		614
615	cn us	Average Salary: Departments VS Company Average Salary: Departments VS Company	hard hard		🔒 🔒		615
616	cn us	Add Bold Tag in String Add Bold Tag in String	medium medium		🔒 🔒		616
617	cn us	Merge Two Binary Trees Merge Two Binary Trees	easy easy			✅	617
618	cn us	Students Report By Geography Students Report By Geography	hard hard		🔒 🔒		618
619	cn us	Biggest Single Number Biggest Single Number	easy easy		🔒 🔒		619
620	cn us	Not Boring Movies Not Boring Movies	easy easy				620
621	cn us	Task Scheduler Task Scheduler	medium medium			✅	621
623	cn us	Add One Row to Tree Add One Row to Tree	medium medium				623
624	cn us	Maximum Distance in Arrays Maximum Distance in Arrays	easy easy		🔒 🔒		624
625	cn us	Minimum Factorization Minimum Factorization	medium medium		🔒 🔒		625
626	cn us	Exchange Seats Exchange Seats	medium medium				626
627	cn us	Swap Salary Swap Salary	easy easy				627
628	cn us	Maximum Product of Three Numbers Maximum Product of Three Numbers	easy easy			✅	628
629	cn us	K Inverse Pairs Array K Inverse Pairs Array	hard hard			✅	629
630	cn us	Course Schedule III Course Schedule III	hard hard			❌	630
631	cn us	Design Excel Sum Formula Design Excel Sum Formula	hard hard		🔒 🔒		631
632	cn us	Smallest Range Covering Elements from K Lists Smallest Range Covering Elements from K Lists	hard hard				632
633	cn us	Sum of Square Numbers Sum of Square Numbers	easy easy				633
634	cn us	Find the Derangement of An Array Find the Derangement of An Array	medium medium		🔒 🔒		634
635	cn us	Design Log Storage System Design Log Storage System	medium medium		🔒 🔒		635
636	cn us	Exclusive Time of Functions Exclusive Time of Functions	medium medium				636
637	cn us	Average of Levels in Binary Tree Average of Levels in Binary Tree	easy easy				637
638	cn us	Shopping Offers Shopping Offers	medium medium			✅	638
639	cn us	Decode Ways II Decode Ways II	hard hard				639
640	cn us	Solve the Equation Solve the Equation	medium medium			✅	640
642	cn us	Design Search Autocomplete System Design Search Autocomplete System	hard hard		🔒 🔒		642
643	cn us	Maximum Average Subarray I Maximum Average Subarray I	easy easy			✅	643
644	cn us	Maximum Average Subarray II Maximum Average Subarray II	hard hard		🔒 🔒		644
645	cn us	Set Mismatch Set Mismatch	easy easy				645
646	cn us	Maximum Length of Pair Chain Maximum Length of Pair Chain	medium medium			✅	646
647	cn us	Palindromic Substrings Palindromic Substrings	medium medium			✅	647
648	cn us	Replace Words Replace Words	medium medium				648
649	cn us	Dota2 Senate Dota2 Senate	medium medium			✅	649
650	cn us	2 Keys Keyboard 2 Keys Keyboard	medium medium			✅	650
651	cn us	4 Keys Keyboard 4 Keys Keyboard	medium medium		🔒 🔒		651
652	cn us	Find Duplicate Subtrees Find Duplicate Subtrees	medium medium				652
653	cn us	Two Sum IV - Input is a BST Two Sum IV - Input is a BST	easy easy				653
654	cn us	Maximum Binary Tree Maximum Binary Tree	medium medium			✅	654
655	cn us	Print Binary Tree Print Binary Tree	medium medium				655
656	cn us	Coin Path Coin Path	hard hard		🔒 🔒		656
657	cn us	Robot Return to Origin Robot Return to Origin	easy easy			✅	657
658	cn us	Find K Closest Elements Find K Closest Elements	medium medium			✅	658
659	cn us	Split Array into Consecutive Subsequences Split Array into Consecutive Subsequences	medium medium				659
660	cn us	Remove 9 Remove 9	hard hard		🔒 🔒		660
661	cn us	Image Smoother Image Smoother	easy easy				661
662	cn us	Maximum Width of Binary Tree Maximum Width of Binary Tree	medium medium				662
663	cn us	Equal Tree Partition Equal Tree Partition	medium medium		🔒 🔒		663
664	cn us	Strange Printer Strange Printer	hard hard			✅	664
665	cn us	Non-decreasing Array Non-decreasing Array	easy easy			✅	665
666	cn us	Path Sum IV Path Sum IV	medium medium		🔒 🔒		666
667	cn us	Beautiful Arrangement II Beautiful Arrangement II	medium medium			✅	667
668	cn us	Kth Smallest Number in Multiplication Table Kth Smallest Number in Multiplication Table	hard hard			✅	668
669	cn us	Trim a Binary Search Tree Trim a Binary Search Tree	easy easy				669
670	cn us	Maximum Swap Maximum Swap	medium medium			✅	670
671	cn us	Second Minimum Node In a Binary Tree Second Minimum Node In a Binary Tree	easy easy				671
672	cn us	Bulb Switcher II Bulb Switcher II	medium medium				672
673	cn us	Number of Longest Increasing Subsequence Number of Longest Increasing Subsequence	medium medium				673
674	cn us	Longest Continuous Increasing Subsequence Longest Continuous Increasing Subsequence	easy easy			✅	674
675	cn us	Cut Off Trees for Golf Event Cut Off Trees for Golf Event	hard hard			❌	675
676	cn us	Implement Magic Dictionary Implement Magic Dictionary	medium medium				676
677	cn us	Map Sum Pairs Map Sum Pairs	medium medium				677
678	cn us	Valid Parenthesis String Valid Parenthesis String	medium medium			✅	678
679	cn us	24 Game 24 Game	hard hard				679
680	cn us	Valid Palindrome II Valid Palindrome II	easy easy			✅	680
681	cn us	Next Closest Time Next Closest Time	medium medium		🔒 🔒		681
682	cn us	Baseball Game Baseball Game	easy easy			✅	682
683	cn us	K Empty Slots K Empty Slots	hard hard		🔒 🔒		683
684	cn us	Redundant Connection Redundant Connection	medium medium			✅	684
685	cn us	Redundant Connection II Redundant Connection II	hard hard				685
686	cn us	Repeated String Match Repeated String Match	easy easy			✅	686
687	cn us	Longest Univalue Path Longest Univalue Path	easy easy			✅	687
688	cn us	Knight Probability in Chessboard Knight Probability in Chessboard	medium medium			✅	688
689	cn us	Maximum Sum of 3 Non-Overlapping Subarrays Maximum Sum of 3 Non-Overlapping Subarrays	hard hard			✅	689
690	cn us	Employee Importance Employee Importance	easy easy				690
691	cn us	Stickers to Spell Word Stickers to Spell Word	hard hard				691
692	cn us	Top K Frequent Words Top K Frequent Words	medium medium			✅	692
693	cn us	Binary Number with Alternating Bits Binary Number with Alternating Bits	easy easy				693
694	cn us	Number of Distinct Islands Number of Distinct Islands	medium medium		🔒 🔒		694
695	cn us	Max Area of Island Max Area of Island	medium medium			✅	695
696	cn us	Count Binary Substrings Count Binary Substrings	easy easy				696
697	cn us	Degree of an Array Degree of an Array	easy easy				697
698	cn us	Partition to K Equal Sum Subsets Partition to K Equal Sum Subsets	medium medium			✅	698
699	cn us	Falling Squares Falling Squares	hard hard				699
711	cn us	Number of Distinct Islands II Number of Distinct Islands II	hard hard		🔒 🔒		711
712	cn us	Minimum ASCII Delete Sum for Two Strings Minimum ASCII Delete Sum for Two Strings	medium medium			✅	712
713	cn us	Subarray Product Less Than K Subarray Product Less Than K	medium medium			✅	713
714	cn us	Best Time to Buy and Sell Stock with Transaction Fee Best Time to Buy and Sell Stock with Transaction Fee	medium medium			✅	714
715	cn us	Range Module Range Module	hard hard			✅	715
716	cn us	Max Stack Max Stack	easy easy		🔒 🔒		716
717	cn us	1-bit and 2-bit Characters 1-bit and 2-bit Characters	easy easy			✅	717
718	cn us	Maximum Length of Repeated Subarray Maximum Length of Repeated Subarray	medium medium			✅	718
719	cn us	Find K-th Smallest Pair Distance Find K-th Smallest Pair Distance	hard hard			✅	719
720	cn us	Longest Word in Dictionary Longest Word in Dictionary	easy easy			✅	720
721	cn us	Accounts Merge Accounts Merge	medium medium			✅	721
722	cn us	Remove Comments Remove Comments	medium medium				722
723	cn us	Candy Crush Candy Crush	medium medium		🔒 🔒		723
724	cn us	Find Pivot Index Find Pivot Index	easy easy				724
725	cn us	Split Linked List in Parts Split Linked List in Parts	medium medium				725
726	cn us	Number of Atoms Number of Atoms	hard hard				726
727	cn us	Minimum Window Subsequence Minimum Window Subsequence	hard hard		🔒 🔒		727
728	cn us	Self Dividing Numbers Self Dividing Numbers	easy easy			✅	728
729	cn us	My Calendar I My Calendar I	medium medium			✅	729
730	cn us	Count Different Palindromic Subsequences Count Different Palindromic Subsequences	hard hard				730
731	cn us	My Calendar II My Calendar II	medium medium				731
732	cn us	My Calendar III My Calendar III	hard hard				732
733	cn us	Flood Fill Flood Fill	easy easy				733
734	cn us	Sentence Similarity Sentence Similarity	easy easy		🔒 🔒		734
735	cn us	Asteroid Collision Asteroid Collision	medium medium				735
736	cn us	Parse Lisp Expression Parse Lisp Expression	hard hard				736
737	cn us	Sentence Similarity II Sentence Similarity II	medium medium		🔒 🔒		737
738	cn us	Monotone Increasing Digits Monotone Increasing Digits	medium medium				738
739	cn us	Daily Temperatures Daily Temperatures	medium medium				739
740	cn us	Delete and Earn Delete and Earn	medium medium			✅	740
741	cn us	Cherry Pickup Cherry Pickup	hard hard				741
709	cn us	To Lower Case To Lower Case	easy easy				742
742	cn us	Closest Leaf in a Binary Tree Closest Leaf in a Binary Tree	medium medium		🔒 🔒		743
743	cn us	Network Delay Time Network Delay Time	medium medium				744
744	cn us	Find Smallest Letter Greater Than Target Find Smallest Letter Greater Than Target	easy easy			✅	745
745	cn us	Prefix and Suffix Search Prefix and Suffix Search	hard hard				746
746	cn us	Min Cost Climbing Stairs Min Cost Climbing Stairs	easy easy			✅	747
747	cn us	Largest Number At Least Twice of Others Largest Number At Least Twice of Others	easy easy			✅	748
748	cn us	Shortest Completing Word Shortest Completing Word	easy easy				749
749	cn us	Contain Virus Contain Virus	hard hard				750
750	cn us	Number Of Corner Rectangles Number Of Corner Rectangles	medium medium		🔒 🔒		751
751	cn us	IP to CIDR IP to CIDR	easy easy		🔒 🔒		752
752	cn us	Open the Lock Open the Lock	medium medium				753
753	cn us	Cracking the Safe Cracking the Safe	hard hard				754
754	cn us	Reach a Number Reach a Number	medium medium				755
755	cn us	Pour Water Pour Water	medium medium		🔒 🔒		756
756	cn us	Pyramid Transition Matrix Pyramid Transition Matrix	medium medium				757
426	cn us	Convert Binary Search Tree to Sorted Doubly Linked List Convert Binary Search Tree to Sorted Doubly Linked List	medium medium		🔒 🔒		758
757	cn us	Set Intersection Size At Least Two Set Intersection Size At Least Two	hard hard				759
758	cn us	Bold Words in String Bold Words in String	easy easy		🔒 🔒		760
759	cn us	Employee Free Time Employee Free Time	hard hard		🔒 🔒		761
760	cn us	Find Anagram Mappings Find Anagram Mappings	easy easy		🔒 🔒		762
761	cn us	Special Binary String Special Binary String	hard hard				763
429	cn us	N-ary Tree Level Order Traversal N-ary Tree Level Order Traversal	medium medium				764
428	cn us	Serialize and Deserialize N-ary Tree Serialize and Deserialize N-ary Tree	hard hard		🔒 🔒		765
430	cn us	Flatten a Multilevel Doubly Linked List Flatten a Multilevel Doubly Linked List	medium medium				766
762	cn us	Prime Number of Set Bits in Binary Representation Prime Number of Set Bits in Binary Representation	easy easy				767
763	cn us	Partition Labels Partition Labels	medium medium			✅	768
764	cn us	Largest Plus Sign Largest Plus Sign	medium medium			✅	769
765	cn us	Couples Holding Hands Couples Holding Hands	hard hard				770
431	cn us	Encode N-ary Tree to Binary Tree Encode N-ary Tree to Binary Tree	hard hard		🔒 🔒		771
427	cn us	Construct Quad Tree Construct Quad Tree	medium medium				772
558	cn us	Logical OR of Two Binary Grids Represented as Quad-Trees Logical OR of Two Binary Grids Represented as Quad-Trees	medium medium				773
559	cn us	Maximum Depth of N-ary Tree Maximum Depth of N-ary Tree	easy easy				774
589	cn us	N-ary Tree Preorder Traversal N-ary Tree Preorder Traversal	easy easy				775
590	cn us	N-ary Tree Postorder Traversal N-ary Tree Postorder Traversal	easy easy				776
766	cn us	Toeplitz Matrix Toeplitz Matrix	easy easy			✅	777
767	cn us	Reorganize String Reorganize String	medium medium			✅	778
768	cn us	Max Chunks To Make Sorted II Max Chunks To Make Sorted II	hard hard			✅	779
769	cn us	Max Chunks To Make Sorted Max Chunks To Make Sorted	medium medium			✅	780
770	cn us	Basic Calculator IV Basic Calculator IV	hard hard				781
771	cn us	Jewels and Stones Jewels and Stones	easy easy			✅	782
700	cn us	Search in a Binary Search Tree Search in a Binary Search Tree	easy easy				783
701	cn us	Insert into a Binary Search Tree Insert into a Binary Search Tree	medium medium				784
772	cn us	Basic Calculator III Basic Calculator III	hard hard		🔒 🔒		785
702	cn us	Search in a Sorted Array of Unknown Size Search in a Sorted Array of Unknown Size	medium medium		🔒 🔒		786
773	cn us	Sliding Puzzle Sliding Puzzle	hard hard				787
774	cn us	Minimize Max Distance to Gas Station Minimize Max Distance to Gas Station	hard hard		🔒 🔒		788
703	cn us	Kth Largest Element in a Stream Kth Largest Element in a Stream	easy easy				789
775	cn us	Global and Local Inversions Global and Local Inversions	medium medium			✅	790
776	cn us	Split BST Split BST	medium medium		🔒 🔒		791
704	cn us	Binary Search Binary Search	easy easy				792
777	cn us	Swap Adjacent in LR String Swap Adjacent in LR String	medium medium			❌	793
778	cn us	Swim in Rising Water Swim in Rising Water	hard hard			✅	794
779	cn us	K-th Symbol in Grammar K-th Symbol in Grammar	medium medium			✅	795
780	cn us	Reaching Points Reaching Points	hard hard			✅	796
781	cn us	Rabbits in Forest Rabbits in Forest	medium medium			✅	797
782	cn us	Transform to Chessboard Transform to Chessboard	hard hard				798
783	cn us	Minimum Distance Between BST Nodes Minimum Distance Between BST Nodes	easy easy			✅	799
784	cn us	Letter Case Permutation Letter Case Permutation	easy easy			✅	800
785	cn us	Is Graph Bipartite? Is Graph Bipartite?	medium medium			✅	801
786	cn us	K-th Smallest Prime Fraction K-th Smallest Prime Fraction	hard hard			✅	802
787	cn us	Cheapest Flights Within K Stops Cheapest Flights Within K Stops	medium medium			✅	803
788	cn us	Rotated Digits Rotated Digits	easy easy			✅	804
789	cn us	Escape The Ghosts Escape The Ghosts	medium medium				805
790	cn us	Domino and Tromino Tiling Domino and Tromino Tiling	medium medium			✅	806
791	cn us	Custom Sort String Custom Sort String	medium medium			✅	807
792	cn us	Number of Matching Subsequences Number of Matching Subsequences	medium medium			✅	808
793	cn us	Preimage Size of Factorial Zeroes Function Preimage Size of Factorial Zeroes Function	hard hard			✅	809
794	cn us	Valid Tic-Tac-Toe State Valid Tic-Tac-Toe State	medium medium			✅	810
795	cn us	Number of Subarrays with Bounded Maximum Number of Subarrays with Bounded Maximum	medium medium			✅	811
796	cn us	Rotate String Rotate String	easy easy			✅	812
797	cn us	All Paths From Source to Target All Paths From Source to Target	medium medium			✅	813
798	cn us	Smallest Rotation with Highest Score Smallest Rotation with Highest Score	hard hard			✅	814
799	cn us	Champagne Tower Champagne Tower	medium medium			✅	815
705	cn us	Design HashSet Design HashSet	easy easy				816
706	cn us	Design HashMap Design HashMap	easy easy				817
800	cn us	Similar RGB Color Similar RGB Color	easy easy		🔒 🔒	✅	818
801	cn us	Minimum Swaps To Make Sequences Increasing Minimum Swaps To Make Sequences Increasing	medium medium			✅	819
802	cn us	Find Eventual Safe States Find Eventual Safe States	medium medium			✅	820
803	cn us	Bricks Falling When Hit Bricks Falling When Hit	hard hard				821
804	cn us	Unique Morse Code Words Unique Morse Code Words	easy easy			✅	822
805	cn us	Split Array With Same Average Split Array With Same Average	hard hard			✅	823
806	cn us	Number of Lines To Write String Number of Lines To Write String	easy easy			✅	824
807	cn us	Max Increase to Keep City Skyline Max Increase to Keep City Skyline	medium medium			✅	825
808	cn us	Soup Servings Soup Servings	medium medium			✅	826
809	cn us	Expressive Words Expressive Words	medium medium			✅	827
810	cn us	Chalkboard XOR Game Chalkboard XOR Game	hard hard			✅	828
811	cn us	Subdomain Visit Count Subdomain Visit Count	easy easy			✅	829
812	cn us	Largest Triangle Area Largest Triangle Area	easy easy			✅	830
813	cn us	Largest Sum of Averages Largest Sum of Averages	medium medium			✅	831
814	cn us	Binary Tree Pruning Binary Tree Pruning	medium medium			✅	832
815	cn us	Bus Routes Bus Routes	hard hard			✅	833
816	cn us	Ambiguous Coordinates Ambiguous Coordinates	medium medium			✅	834
817	cn us	Linked List Components Linked List Components	medium medium			✅	835
818	cn us	Race Car Race Car	hard hard			✅	836
819	cn us	Most Common Word Most Common Word	easy easy			✅	837
707	cn us	Design Linked List Design Linked List	medium medium				838
820	cn us	Short Encoding of Words Short Encoding of Words	medium medium			✅	839
821	cn us	Shortest Distance to a Character Shortest Distance to a Character	easy easy			✅	841
822	cn us	Card Flipping Game Card Flipping Game	medium medium			✅	842
823	cn us	Binary Trees With Factors Binary Trees With Factors	medium medium			✅	843
708	cn us	Insert into a Sorted Circular Linked List Insert into a Sorted Circular Linked List	medium medium		🔒 🔒		850
824	cn us	Goat Latin Goat Latin	easy easy			✅	851
825	cn us	Friends Of Appropriate Ages Friends Of Appropriate Ages	medium medium			✅	852
826	cn us	Most Profit Assigning Work Most Profit Assigning Work	medium medium			✅	853
827	cn us	Making A Large Island Making A Large Island	hard hard			✅	854
828	cn us	Count Unique Characters of All Substrings of a Given String Count Unique Characters of All Substrings of a Given String	hard hard			✅	855
829	cn us	Consecutive Numbers Sum Consecutive Numbers Sum	hard hard			✅	856
830	cn us	Positions of Large Groups Positions of Large Groups	easy easy			✅	857
831	cn us	Masking Personal Information Masking Personal Information	medium medium			✅	858
641	cn us	Design Circular Deque Design Circular Deque	medium medium				859
622	cn us	Design Circular Queue Design Circular Queue	medium medium				860
832	cn us	Flipping an Image Flipping an Image	easy easy			✅	861
833	cn us	Find And Replace in String Find And Replace in String	medium medium			✅	862
834	cn us	Sum of Distances in Tree Sum of Distances in Tree	hard hard			✅	863
835	cn us	Image Overlap Image Overlap	medium medium			✅	864
489	cn us	Robot Room Cleaner Robot Room Cleaner	hard hard		🔒 🔒		865
836	cn us	Rectangle Overlap Rectangle Overlap	easy easy			✅	866
837	cn us	New 21 Game New 21 Game	medium medium			✅	867
838	cn us	Push Dominoes Push Dominoes	medium medium			✅	868
839	cn us	Similar String Groups Similar String Groups	hard hard			✅	869
840	cn us	Magic Squares In Grid Magic Squares In Grid	easy easy			✅	870
841	cn us	Keys and Rooms Keys and Rooms	medium medium			✅	871
842	cn us	Split Array into Fibonacci Sequence Split Array into Fibonacci Sequence	medium medium			✅	872
843	cn us	Guess the Word Guess the Word	hard hard			✅	873
844	cn us	Backspace String Compare Backspace String Compare	easy easy			✅	874
845	cn us	Longest Mountain in Array Longest Mountain in Array	medium medium			✅	875
846	cn us	Hand of Straights Hand of Straights	medium medium			✅	876
847	cn us	Shortest Path Visiting All Nodes Shortest Path Visiting All Nodes	hard hard			✅	877
848	cn us	Shifting Letters Shifting Letters	medium medium			✅	878
849	cn us	Maximize Distance to Closest Person Maximize Distance to Closest Person	easy easy			✅	879
850	cn us	Rectangle Area II Rectangle Area II	hard hard				880
851	cn us	Loud and Rich Loud and Rich	medium medium			✅	881
852	cn us	Peak Index in a Mountain Array Peak Index in a Mountain Array	easy easy			✅	882
853	cn us	Car Fleet Car Fleet	medium medium			✅	883
854	cn us	K-Similar Strings K-Similar Strings	hard hard				884
855	cn us	Exam Room Exam Room	medium medium			✅	885
856	cn us	Score of Parentheses Score of Parentheses	medium medium			✅	886
857	cn us	Minimum Cost to Hire K Workers Minimum Cost to Hire K Workers	hard hard			✅	887
858	cn us	Mirror Reflection Mirror Reflection	medium medium			✅	888
859	cn us	Buddy Strings Buddy Strings	easy easy			✅	889
860	cn us	Lemonade Change Lemonade Change	easy easy			✅	890
861	cn us	Score After Flipping Matrix Score After Flipping Matrix	medium medium			✅	891
862	cn us	Shortest Subarray with Sum at Least K Shortest Subarray with Sum at Least K	hard hard			✅	892
863	cn us	All Nodes Distance K in Binary Tree All Nodes Distance K in Binary Tree	medium medium			✅	893
710	cn us	Random Pick with Blacklist Random Pick with Blacklist	hard hard				894
864	cn us	Shortest Path to Get All Keys Shortest Path to Get All Keys	hard hard			✅	895
865	cn us	Smallest Subtree with all the Deepest Nodes Smallest Subtree with all the Deepest Nodes	medium medium			✅	896
866	cn us	Prime Palindrome Prime Palindrome	medium medium			✅	897
867	cn us	Transpose Matrix Transpose Matrix	easy easy			✅	898
868	cn us	Binary Gap Binary Gap	easy easy			✅	899
869	cn us	Reordered Power of 2 Reordered Power of 2	medium medium			✅	900
870	cn us	Advantage Shuffle Advantage Shuffle	medium medium			✅	901
871	cn us	Minimum Number of Refueling Stops Minimum Number of Refueling Stops	hard hard			✅	902
470	cn us	Implement Rand10() Using Rand7() Implement Rand10() Using Rand7()	medium medium			✅	903
872	cn us	Leaf-Similar Trees Leaf-Similar Trees	easy easy			✅	904
873	cn us	Length of Longest Fibonacci Subsequence Length of Longest Fibonacci Subsequence	medium medium			✅	905
874	cn us	Walking Robot Simulation Walking Robot Simulation	easy easy			✅	906
875	cn us	Koko Eating Bananas Koko Eating Bananas	medium medium			✅	907
876	cn us	Middle of the Linked List Middle of the Linked List	easy easy			✅	908
877	cn us	Stone Game Stone Game	medium medium			✅	909
878	cn us	Nth Magical Number Nth Magical Number	hard hard			✅	910
879	cn us	Profitable Schemes Profitable Schemes	hard hard			✅	911
528	cn us	Random Pick with Weight Random Pick with Weight	medium medium				912
519	cn us	Random Flip Matrix Random Flip Matrix	medium medium				913
497	cn us	Random Point in Non-overlapping Rectangles Random Point in Non-overlapping Rectangles	medium medium				914
478	cn us	Generate Random Point in a Circle Generate Random Point in a Circle	medium medium				915
880	cn us	Decoded String at Index Decoded String at Index	medium medium			✅	916
881	cn us	Boats to Save People Boats to Save People	medium medium			✅	917
882	cn us	Reachable Nodes In Subdivided Graph Reachable Nodes In Subdivided Graph	hard hard			✅	918
883	cn us	Projection Area of 3D Shapes Projection Area of 3D Shapes	easy easy			✅	919
884	cn us	Uncommon Words from Two Sentences Uncommon Words from Two Sentences	easy easy			✅	920
885	cn us	Spiral Matrix III Spiral Matrix III	medium medium			✅	921
886	cn us	Possible Bipartition Possible Bipartition	medium medium			✅	922
887	cn us	Super Egg Drop Super Egg Drop	hard hard			✅	923
888	cn us	Fair Candy Swap Fair Candy Swap	easy easy			✅	924
889	cn us	Construct Binary Tree from Preorder and Postorder Traversal Construct Binary Tree from Preorder and Postorder Traversal	medium medium			✅	925
890	cn us	Find and Replace Pattern Find and Replace Pattern	medium medium			✅	926
891	cn us	Sum of Subsequence Widths Sum of Subsequence Widths	hard hard			✅	927
892	cn us	Surface Area of 3D Shapes Surface Area of 3D Shapes	easy easy			✅	928
893	cn us	Groups of Special-Equivalent Strings Groups of Special-Equivalent Strings	easy easy			✅	929
894	cn us	All Possible Full Binary Trees All Possible Full Binary Trees	medium medium			✅	930
895	cn us	Maximum Frequency Stack Maximum Frequency Stack	hard hard			✅	931
896	cn us	Monotonic Array Monotonic Array	easy easy			✅	932
897	cn us	Increasing Order Search Tree Increasing Order Search Tree	easy easy			✅	933
898	cn us	Bitwise ORs of Subarrays Bitwise ORs of Subarrays	medium medium			✅	934
899	cn us	Orderly Queue Orderly Queue	hard hard			✅	935
900	cn us	RLE Iterator RLE Iterator	medium medium			✅	936
901	cn us	Online Stock Span Online Stock Span	medium medium			✅	937
902	cn us	Numbers At Most N Given Digit Set Numbers At Most N Given Digit Set	hard hard			✅	938
903	cn us	Valid Permutations for DI Sequence Valid Permutations for DI Sequence	hard hard			✅	939
904	cn us	Fruit Into Baskets Fruit Into Baskets	medium medium			✅	940
905	cn us	Sort Array By Parity Sort Array By Parity	easy easy			✅	941
906	cn us	Super Palindromes Super Palindromes	hard hard			✅	942
907	cn us	Sum of Subarray Minimums Sum of Subarray Minimums	medium medium			✅	943
908	cn us	Smallest Range I Smallest Range I	easy easy			✅	944
909	cn us	Snakes and Ladders Snakes and Ladders	medium medium			✅	945
910	cn us	Smallest Range II Smallest Range II	medium medium			✅	946
911	cn us	Online Election Online Election	medium medium			✅	947
912	cn us	Sort an Array Sort an Array	medium medium			✅	948
913	cn us	Cat and Mouse Cat and Mouse	hard hard			✅	949
914	cn us	X of a Kind in a Deck of Cards X of a Kind in a Deck of Cards	easy easy			✅	950
915	cn us	Partition Array into Disjoint Intervals Partition Array into Disjoint Intervals	medium medium			✅	951
916	cn us	Word Subsets Word Subsets	medium medium			✅	952
917	cn us	Reverse Only Letters Reverse Only Letters	easy easy			✅	953
918	cn us	Maximum Sum Circular Subarray Maximum Sum Circular Subarray	medium medium			✅	954
919	cn us	Complete Binary Tree Inserter Complete Binary Tree Inserter	medium medium			✅	955
920	cn us	Number of Music Playlists Number of Music Playlists	hard hard			✅	956
921	cn us	Minimum Add to Make Parentheses Valid Minimum Add to Make Parentheses Valid	medium medium			✅	957
922	cn us	Sort Array By Parity II Sort Array By Parity II	easy easy			✅	958
923	cn us	3Sum With Multiplicity 3Sum With Multiplicity	medium medium			✅	959
924	cn us	Minimize Malware Spread Minimize Malware Spread	hard hard			✅	960
925	cn us	Long Pressed Name Long Pressed Name	easy easy			✅	961
926	cn us	Flip String to Monotone Increasing Flip String to Monotone Increasing	medium medium			✅	962
927	cn us	Three Equal Parts Three Equal Parts	hard hard			✅	963
928	cn us	Minimize Malware Spread II Minimize Malware Spread II	hard hard			✅	964
929	cn us	Unique Email Addresses Unique Email Addresses	easy easy			✅	965
930	cn us	Binary Subarrays With Sum Binary Subarrays With Sum	medium medium			✅	966
931	cn us	Minimum Falling Path Sum Minimum Falling Path Sum	medium medium			✅	967
932	cn us	Beautiful Array Beautiful Array	medium medium			❌	968
933	cn us	Number of Recent Calls Number of Recent Calls	easy easy				969
934	cn us	Shortest Bridge Shortest Bridge	medium medium				971
935	cn us	Knight Dialer Knight Dialer	medium medium				972
936	cn us	Stamping The Sequence Stamping The Sequence	hard hard				973
937	cn us	Reorder Data in Log Files Reorder Data in Log Files	easy easy				974
938	cn us	Range Sum of BST Range Sum of BST	easy easy			✅	975
939	cn us	Minimum Area Rectangle Minimum Area Rectangle	medium medium			✅	976
940	cn us	Distinct Subsequences II Distinct Subsequences II	hard hard				977
941	cn us	Valid Mountain Array Valid Mountain Array	easy easy			✅	978
942	cn us	DI String Match DI String Match	easy easy				979
943	cn us	Find the Shortest Superstring Find the Shortest Superstring	hard hard				980
944	cn us	Delete Columns to Make Sorted Delete Columns to Make Sorted	easy easy				981
945	cn us	Minimum Increment to Make Array Unique Minimum Increment to Make Array Unique	medium medium			✅	982
946	cn us	Validate Stack Sequences Validate Stack Sequences	medium medium			✅	983
947	cn us	Most Stones Removed with Same Row or Column Most Stones Removed with Same Row or Column	medium medium			✅	984
948	cn us	Bag of Tokens Bag of Tokens	medium medium			✅	985
949	cn us	Largest Time for Given Digits Largest Time for Given Digits	easy easy			✅	986
950	cn us	Reveal Cards In Increasing Order Reveal Cards In Increasing Order	medium medium			✅	987
951	cn us	Flip Equivalent Binary Trees Flip Equivalent Binary Trees	medium medium			✅	988
952	cn us	Largest Component Size by Common Factor Largest Component Size by Common Factor	hard hard			❌	989
953	cn us	Verifying an Alien Dictionary Verifying an Alien Dictionary	easy easy			✅	990
954	cn us	Array of Doubled Pairs Array of Doubled Pairs	medium medium				991
955	cn us	Delete Columns to Make Sorted II Delete Columns to Make Sorted II	medium medium				992
956	cn us	Tallest Billboard Tallest Billboard	hard hard				993
957	cn us	Prison Cells After N Days Prison Cells After N Days	medium medium			✅	994
958	cn us	Check Completeness of a Binary Tree Check Completeness of a Binary Tree	medium medium			✅	998
959	cn us	Regions Cut By Slashes Regions Cut By Slashes	medium medium				999
960	cn us	Delete Columns to Make Sorted III Delete Columns to Make Sorted III	hard hard				1000
961	cn us	N-Repeated Element in Size 2N Array N-Repeated Element in Size 2N Array	easy easy				1001
962	cn us	Maximum Width Ramp Maximum Width Ramp	medium medium			✅	1002
963	cn us	Minimum Area Rectangle II Minimum Area Rectangle II	medium medium			✅	1003
964	cn us	Least Operators to Express Number Least Operators to Express Number	hard hard				1004
965	cn us	Univalued Binary Tree Univalued Binary Tree	easy easy			✅	1005
966	cn us	Vowel Spellchecker Vowel Spellchecker	medium medium			✅	1006
967	cn us	Numbers With Same Consecutive Differences Numbers With Same Consecutive Differences	medium medium			✅	1007
968	cn us	Binary Tree Cameras Binary Tree Cameras	hard hard			✅	1008
969	cn us	Pancake Sorting Pancake Sorting	medium medium			✅	1009
970	cn us	Powerful Integers Powerful Integers	easy easy			✅	1010
971	cn us	Flip Binary Tree To Match Preorder Traversal Flip Binary Tree To Match Preorder Traversal	medium medium			✅	1011
972	cn us	Equal Rational Numbers Equal Rational Numbers	hard hard			✅	1012
509	cn us	Fibonacci Number Fibonacci Number	easy easy			✅	1013
973	cn us	K Closest Points to Origin K Closest Points to Origin	medium medium			✅	1014
974	cn us	Subarray Sums Divisible by K Subarray Sums Divisible by K	medium medium			❌	1016
975	cn us	Odd Even Jump Odd Even Jump	hard hard				1017
976	cn us	Largest Perimeter Triangle Largest Perimeter Triangle	easy easy			✅	1018
977	cn us	Squares of a Sorted Array Squares of a Sorted Array	easy easy				1019
978	cn us	Longest Turbulent Subarray Longest Turbulent Subarray	medium medium				1020
979	cn us	Distribute Coins in Binary Tree Distribute Coins in Binary Tree	medium medium				1021
980	cn us	Unique Paths III Unique Paths III	hard hard				1022
981	cn us	Time Based Key-Value Store Time Based Key-Value Store	medium medium				1023
982	cn us	Triples with Bitwise AND Equal To Zero Triples with Bitwise AND Equal To Zero	hard hard				1024
983	cn us	Minimum Cost For Tickets Minimum Cost For Tickets	medium medium				1025
984	cn us	String Without AAA or BBB String Without AAA or BBB	medium medium				1026
985	cn us	Sum of Even Numbers After Queries Sum of Even Numbers After Queries	easy easy			✅	1027
986	cn us	Interval List Intersections Interval List Intersections	medium medium				1028
987	cn us	Vertical Order Traversal of a Binary Tree Vertical Order Traversal of a Binary Tree	medium medium				1029
988	cn us	Smallest String Starting From Leaf Smallest String Starting From Leaf	medium medium				1030
989	cn us	Add to Array-Form of Integer Add to Array-Form of Integer	easy easy				1031
990	cn us	Satisfiability of Equality Equations Satisfiability of Equality Equations	medium medium				1032
991	cn us	Broken Calculator Broken Calculator	medium medium				1033
992	cn us	Subarrays with K Different Integers Subarrays with K Different Integers	hard hard			✅	1034
993	cn us	Cousins in Binary Tree Cousins in Binary Tree	easy easy			✅	1035
994	cn us	Rotting Oranges Rotting Oranges	medium medium			✅	1036
995	cn us	Minimum Number of K Consecutive Bit Flips Minimum Number of K Consecutive Bit Flips	hard hard			✅	1037
996	cn us	Number of Squareful Arrays Number of Squareful Arrays	hard hard			✅	1038
997	cn us	Find the Town Judge Find the Town Judge	easy easy			✅	1039
998	cn us	Maximum Binary Tree II Maximum Binary Tree II	medium medium				1040
999	cn us	Available Captures for Rook Available Captures for Rook	easy easy			✅	1041
1000	cn us	Minimum Cost to Merge Stones Minimum Cost to Merge Stones	hard hard				1042
1001	cn us	Grid Illumination Grid Illumination	hard hard				1043
1002	cn us	Find Common Characters Find Common Characters	easy easy				1044
1003	cn us	Check If Word Is Valid After Substitutions Check If Word Is Valid After Substitutions	medium medium			✅	1045
1004	cn us	Max Consecutive Ones III Max Consecutive Ones III	medium medium				1046
1005	cn us	Maximize Sum Of Array After K Negations Maximize Sum Of Array After K Negations	easy easy				1047
1006	cn us	Clumsy Factorial Clumsy Factorial	medium medium				1048
1007	cn us	Minimum Domino Rotations For Equal Row Minimum Domino Rotations For Equal Row	medium medium				1049
1008	cn us	Construct Binary Search Tree from Preorder Traversal Construct Binary Search Tree from Preorder Traversal	medium medium				1050
1055	cn us	Shortest Way to Form String Shortest Way to Form String	medium medium		🔒 🔒		1051
1057	cn us	Campus Bikes Campus Bikes	medium medium		🔒 🔒		1052
1058	cn us	Minimize Rounding Error to Meet Target Minimize Rounding Error to Meet Target	medium medium		🔒 🔒		1053
1009	cn us	Complement of Base 10 Integer Complement of Base 10 Integer	easy easy			✅	1054
1010	cn us	Pairs of Songs With Total Durations Divisible by 60 Pairs of Songs With Total Durations Divisible by 60	easy easy				1055
1011	cn us	Capacity To Ship Packages Within D Days Capacity To Ship Packages Within D Days	medium medium				1056
1012	cn us	Numbers With Repeated Digits Numbers With Repeated Digits	hard hard				1057
1061	cn us	Lexicographically Smallest Equivalent String Lexicographically Smallest Equivalent String	medium medium		🔒 🔒		1058
1060	cn us	Missing Element in Sorted Array Missing Element in Sorted Array	medium medium		🔒 🔒		1059
1062	cn us	Longest Repeating Substring Longest Repeating Substring	medium medium		🔒 🔒		1060
1063	cn us	Number of Valid Subarrays Number of Valid Subarrays	hard hard		🔒 🔒		1061
1013	cn us	Partition Array Into Three Parts With Equal Sum Partition Array Into Three Parts With Equal Sum	easy easy			✅	1062
1014	cn us	Best Sightseeing Pair Best Sightseeing Pair	medium medium				1063
1015	cn us	Smallest Integer Divisible by K Smallest Integer Divisible by K	medium medium				1064
1016	cn us	Binary String With Substrings Representing 1 To N Binary String With Substrings Representing 1 To N	medium medium				1065
1064	cn us	Fixed Point Fixed Point	easy easy		🔒 🔒		1066
1066	cn us	Campus Bikes II Campus Bikes II	medium medium		🔒 🔒		1067
1067	cn us	Digit Count in Range Digit Count in Range	hard hard		🔒 🔒		1068
1056	cn us	Confusing Number Confusing Number	easy easy		🔒 🔒		1069
1017	cn us	Convert to Base -2 Convert to Base -2	medium medium				1070
1018	cn us	Binary Prefix Divisible By 5 Binary Prefix Divisible By 5	easy easy			✅	1071
1019	cn us	Next Greater Node In Linked List Next Greater Node In Linked List	medium medium			✅	1072
1020	cn us	Number of Enclaves Number of Enclaves	medium medium				1073
1086	cn us	High Five High Five	easy easy		🔒 🔒		1074
1065	cn us	Index Pairs of a String Index Pairs of a String	easy easy		🔒 🔒		1075
1087	cn us	Brace Expansion Brace Expansion	medium medium		🔒 🔒		1076
1088	cn us	Confusing Number II Confusing Number II	hard hard		🔒 🔒		1077
1021	cn us	Remove Outermost Parentheses Remove Outermost Parentheses	easy easy			✅	1078
1022	cn us	Sum of Root To Leaf Binary Numbers Sum of Root To Leaf Binary Numbers	easy easy			✅	1079
1023	cn us	Camelcase Matching Camelcase Matching	medium medium			✅	1080
1024	cn us	Video Stitching Video Stitching	medium medium			✅	1081
1085	cn us	Sum of Digits in the Minimum Number Sum of Digits in the Minimum Number	easy easy		🔒 🔒		1082
1099	cn us	Two Sum Less Than K Two Sum Less Than K	easy easy		🔒 🔒		1083
1100	cn us	Find K-Length Substrings With No Repeated Characters Find K-Length Substrings With No Repeated Characters	medium medium		🔒 🔒		1084
1101	cn us	The Earliest Moment When Everyone Become Friends The Earliest Moment When Everyone Become Friends	medium medium		🔒 🔒		1085
1025	cn us	Divisor Game Divisor Game	easy easy			✅	1086
1027	cn us	Longest Arithmetic Sequence Longest Arithmetic Sequence	medium medium			✅	1087
1118	cn us	Number of Days in a Month Number of Days in a Month	easy easy		🔒 🔒		1088
1119	cn us	Remove Vowels from a String Remove Vowels from a String	easy easy		🔒 🔒		1089
1134	cn us	Armstrong Number Armstrong Number	easy easy		🔒 🔒		1090
1120	cn us	Maximum Average Subtree Maximum Average Subtree	medium medium		🔒 🔒		1091
1026	cn us	Maximum Difference Between Node and Ancestor Maximum Difference Between Node and Ancestor	medium medium			✅	1092
1028	cn us	Recover a Tree From Preorder Traversal Recover a Tree From Preorder Traversal	hard hard			✅	1093
1030	cn us	Matrix Cells in Distance Order Matrix Cells in Distance Order	easy easy			✅	1094
1029	cn us	Two City Scheduling Two City Scheduling	easy easy			✅	1095
1031	cn us	Maximum Sum of Two Non-Overlapping Subarrays Maximum Sum of Two Non-Overlapping Subarrays	medium medium			✅	1096
1032	cn us	Stream of Characters Stream of Characters	hard hard			✅	1097
1133	cn us	Largest Unique Number Largest Unique Number	easy easy		🔒 🔒		1098
1102	cn us	Path With Maximum Minimum Value Path With Maximum Minimum Value	medium medium		🔒 🔒		1099
1135	cn us	Connecting Cities With Minimum Cost Connecting Cities With Minimum Cost	medium medium		🔒 🔒		1100
1136	cn us	Parallel Courses Parallel Courses	hard hard		🔒 🔒		1101
1150	cn us	Check If a Number Is Majority Element in a Sorted Array Check If a Number Is Majority Element in a Sorted Array	easy easy		🔒 🔒		1102
1033	cn us	Moving Stones Until Consecutive Moving Stones Until Consecutive	easy easy			✅	1103
1034	cn us	Coloring A Border Coloring A Border	medium medium			✅	1104
1035	cn us	Uncrossed Lines Uncrossed Lines	medium medium			✅	1105
1036	cn us	Escape a Large Maze Escape a Large Maze	hard hard			✅	1106
1151	cn us	Minimum Swaps to Group All 1's Together Minimum Swaps to Group All 1's Together	medium medium		🔒 🔒		1107
1152	cn us	Analyze User Website Visit Pattern Analyze User Website Visit Pattern	medium medium		🔒 🔒		1108
1039	cn us	Minimum Score Triangulation of Polygon Minimum Score Triangulation of Polygon	medium medium			✅	1111
1160	cn us	Find Words That Can Be Formed by Characters Find Words That Can Be Formed by Characters	easy easy			✅	1112
1040	cn us	Moving Stones Until Consecutive II Moving Stones Until Consecutive II	medium medium			✅	1113
1038	cn us	Binary Search Tree to Greater Sum Tree Binary Search Tree to Greater Sum Tree	medium medium			✅	1114
1037	cn us	Valid Boomerang Valid Boomerang	easy easy			✅	1115
1161	cn us	Maximum Level Sum of a Binary Tree Maximum Level Sum of a Binary Tree	medium medium				1116
1162	cn us	As Far from Land as Possible As Far from Land as Possible	medium medium			✅	1117
1121	cn us	Divide Array Into Increasing Sequences Divide Array Into Increasing Sequences	hard hard		🔒 🔒		1118
1041	cn us	Robot Bounded In Circle Robot Bounded In Circle	medium medium			✅	1119
1042	cn us	Flower Planting With No Adjacent Flower Planting With No Adjacent	easy easy			✅	1120
1043	cn us	Partition Array for Maximum Sum Partition Array for Maximum Sum	medium medium			✅	1121
1044	cn us	Longest Duplicate Substring Longest Duplicate Substring	hard hard			❌	1122
1165	cn us	Single-Row Keyboard Single-Row Keyboard	easy easy		🔒 🔒		1123
1153	cn us	String Transforms Into Another String String Transforms Into Another String	hard hard		🔒 🔒		1124
1166	cn us	Design File System Design File System	medium medium		🔒 🔒		1125
1167	cn us	Minimum Cost to Connect Sticks Minimum Cost to Connect Sticks	medium medium		🔒 🔒		1126
1046	cn us	Last Stone Weight Last Stone Weight	easy easy				1127
1047	cn us	Remove All Adjacent Duplicates In String Remove All Adjacent Duplicates In String	easy easy				1128
1048	cn us	Longest String Chain Longest String Chain	medium medium				1129
1049	cn us	Last Stone Weight II Last Stone Weight II	medium medium				1130
1180	cn us	Count Substrings with Only One Distinct Letter Count Substrings with Only One Distinct Letter	easy easy		🔒 🔒		1131
1181	cn us	Before and After Puzzle Before and After Puzzle	medium medium		🔒 🔒		1132
1163	cn us	Last Substring in Lexicographical Order Last Substring in Lexicographical Order	hard hard				1133
1182	cn us	Shortest Distance to Target Color Shortest Distance to Target Color	medium medium		🔒 🔒		1134
1045	cn us	Customers Who Bought All Products Customers Who Bought All Products	medium medium		🔒 🔒		1135
1050	cn us	Actors and Directors Who Cooperated At Least Three Times Actors and Directors Who Cooperated At Least Three Times	easy easy		🔒 🔒		1136
1051	cn us	Height Checker Height Checker	easy easy			✅	1137
1052	cn us	Grumpy Bookstore Owner Grumpy Bookstore Owner	medium medium			✅	1138
1053	cn us	Previous Permutation With One Swap Previous Permutation With One Swap	medium medium			✅	1139
1054	cn us	Distant Barcodes Distant Barcodes	medium medium			✅	1140
1196	cn us	How Many Apples Can You Put into the Basket How Many Apples Can You Put into the Basket	easy easy		🔒 🔒		1141
1197	cn us	Minimum Knight Moves Minimum Knight Moves	medium medium		🔒 🔒		1142
1198	cn us	Find Smallest Common Element in All Rows Find Smallest Common Element in All Rows	medium medium		🔒 🔒		1143
1168	cn us	Optimize Water Distribution in a Village Optimize Water Distribution in a Village	hard hard		🔒 🔒		1144
1074	cn us	Number of Submatrices That Sum to Target Number of Submatrices That Sum to Target	hard hard				1145
1071	cn us	Greatest Common Divisor of Strings Greatest Common Divisor of Strings	easy easy			✅	1146
1072	cn us	Flip Columns For Maximum Number of Equal Rows Flip Columns For Maximum Number of Equal Rows	medium medium			✅	1147
1073	cn us	Adding Two Negabinary Numbers Adding Two Negabinary Numbers	medium medium				1148
1213	cn us	Intersection of Three Sorted Arrays Intersection of Three Sorted Arrays	easy easy		🔒 🔒		1149
1214	cn us	Two Sum BSTs Two Sum BSTs	medium medium		🔒 🔒		1150
1215	cn us	Stepping Numbers Stepping Numbers	medium medium		🔒 🔒		1151
1183	cn us	Maximum Number of Ones Maximum Number of Ones	hard hard		🔒 🔒		1152
1068	cn us	Product Sales Analysis I Product Sales Analysis I	easy easy		🔒 🔒		1153
1069	cn us	Product Sales Analysis II Product Sales Analysis II	easy easy		🔒 🔒		1154
1070	cn us	Product Sales Analysis III Product Sales Analysis III	medium medium		🔒 🔒		1155
1078	cn us	Occurrences After Bigram Occurrences After Bigram	easy easy				1156
1080	cn us	Insufficient Nodes in Root to Leaf Paths Insufficient Nodes in Root to Leaf Paths	medium medium				1157
1081	cn us	Smallest Subsequence of Distinct Characters Smallest Subsequence of Distinct Characters	medium medium				1159
1079	cn us	Letter Tile Possibilities Letter Tile Possibilities	medium medium				1160
1075	cn us	Project Employees I Project Employees I	easy easy		🔒 🔒		1161
1076	cn us	Project Employees II Project Employees II	easy easy		🔒 🔒		1162
1077	cn us	Project Employees III Project Employees III	medium medium		🔒 🔒		1163
1228	cn us	Missing Number In Arithmetic Progression Missing Number In Arithmetic Progression	easy easy		🔒 🔒		1164
1229	cn us	Meeting Scheduler Meeting Scheduler	medium medium		🔒 🔒		1165
1230	cn us	Toss Strange Coins Toss Strange Coins	medium medium		🔒 🔒		1166
1199	cn us	Minimum Time to Build Blocks Minimum Time to Build Blocks	hard hard		🔒 🔒		1167
1089	cn us	Duplicate Zeros Duplicate Zeros	easy easy				1168
1090	cn us	Largest Values From Labels Largest Values From Labels	medium medium				1169
1092	cn us	Shortest Common Supersequence Shortest Common Supersequence	hard hard				1170
1091	cn us	Shortest Path in Binary Matrix Shortest Path in Binary Matrix	medium medium				1171
1082	cn us	Sales Analysis I Sales Analysis I	easy easy		🔒 🔒		1172
1083	cn us	Sales Analysis II Sales Analysis II	easy easy		🔒 🔒		1173
1084	cn us	Sales Analysis III Sales Analysis III	easy easy		🔒 🔒		1174
1243	cn us	Array Transformation Array Transformation	easy easy		🔒 🔒		1175
1244	cn us	Design A Leaderboard Design A Leaderboard	medium medium		🔒 🔒		1176
1245	cn us	Tree Diameter Tree Diameter	medium medium		🔒 🔒		1177
1216	cn us	Valid Palindrome III Valid Palindrome III	hard hard		🔒 🔒		1178
511	cn us	Game Play Analysis I Game Play Analysis I	easy easy		🔒 🔒		1179
512	cn us	Game Play Analysis II Game Play Analysis II	easy easy		🔒 🔒		1180
534	cn us	Game Play Analysis III Game Play Analysis III	medium medium		🔒 🔒		1181
550	cn us	Game Play Analysis IV Game Play Analysis IV	medium medium		🔒 🔒		1182
1093	cn us	Statistics from a Large Sample Statistics from a Large Sample	medium medium				1183
1094	cn us	Car Pooling Car Pooling	medium medium				1184
1095	cn us	Find in Mountain Array Find in Mountain Array	hard hard				1185
1117	cn us	Building H2O Building H2O	medium medium			✅	1186
1115	cn us	Print FooBar Alternately Print FooBar Alternately	medium medium			✅	1187
1096	cn us	Brace Expansion II Brace Expansion II	hard hard				1188
1256	cn us	Encode Number Encode Number	medium medium		🔒 🔒		1189
1257	cn us	Smallest Common Region Smallest Common Region	medium medium		🔒 🔒		1190
1258	cn us	Synonymous Sentences Synonymous Sentences	medium medium		🔒 🔒		1191
1231	cn us	Divide Chocolate Divide Chocolate	hard hard		🔒 🔒		1192
1097	cn us	Game Play Analysis V Game Play Analysis V	hard hard		🔒 🔒		1193
1104	cn us	Path In Zigzag Labelled Binary Tree Path In Zigzag Labelled Binary Tree	medium medium				1194
1103	cn us	Distribute Candies to People Distribute Candies to People	easy easy			✅	1195
1105	cn us	Filling Bookcase Shelves Filling Bookcase Shelves	medium medium				1196
1106	cn us	Parsing A Boolean Expression Parsing A Boolean Expression	hard hard				1197
1098	cn us	Unpopular Books Unpopular Books	medium medium		🔒 🔒		1198
1271	cn us	Hexspeak Hexspeak	easy easy		🔒 🔒		1199
1272	cn us	Remove Interval Remove Interval	medium medium		🔒 🔒		1200
1273	cn us	Delete Tree Nodes Delete Tree Nodes	medium medium		🔒 🔒		1201
1246	cn us	Palindrome Removal Palindrome Removal	hard hard		🔒 🔒		1202
1114	cn us	Print in Order Print in Order	easy easy			✅	1203
1107	cn us	New Users Daily Count New Users Daily Count	medium medium		🔒 🔒		1204
1108	cn us	Defanging an IP Address Defanging an IP Address	easy easy				1205
1109	cn us	Corporate Flight Bookings Corporate Flight Bookings	medium medium				1206
1110	cn us	Delete Nodes And Return Forest Delete Nodes And Return Forest	medium medium				1207
1111	cn us	Maximum Nesting Depth of Two Valid Parentheses Strings Maximum Nesting Depth of Two Valid Parentheses Strings	medium medium			✅	1208
1188	cn us	Design Bounded Blocking Queue Design Bounded Blocking Queue	medium medium		🔒 🔒		1209
1286	cn us	Iterator for Combination Iterator for Combination	medium medium				1211
1291	cn us	Sequential Digits Sequential Digits	medium medium				1212
1259	cn us	Handshakes That Don't Cross Handshakes That Don't Cross	hard hard		🔒 🔒		1213
1112	cn us	Highest Grade For Each Student Highest Grade For Each Student	medium medium		🔒 🔒		1214
1113	cn us	Reported Posts Reported Posts	easy easy		🔒 🔒		1215
1116	cn us	Print Zero Even Odd Print Zero Even Odd	medium medium			✅	1216
1122	cn us	Relative Sort Array Relative Sort Array	easy easy				1217
1123	cn us	Lowest Common Ancestor of Deepest Leaves Lowest Common Ancestor of Deepest Leaves	medium medium				1218
1124	cn us	Longest Well-Performing Interval Longest Well-Performing Interval	medium medium				1219
1125	cn us	Smallest Sufficient Team Smallest Sufficient Team	hard hard			✅	1220
1287	cn us	Element Appearing More Than 25% In Sorted Array Element Appearing More Than 25% In Sorted Array	easy easy			✅	1221
1288	cn us	Remove Covered Intervals Remove Covered Intervals	medium medium				1222
1289	cn us	Minimum Falling Path Sum II Minimum Falling Path Sum II	hard hard				1224
1126	cn us	Active Businesses Active Businesses	medium medium		🔒 🔒		1225
1127	cn us	User Purchase Platform User Purchase Platform	hard hard		🔒 🔒		1226
1128	cn us	Number of Equivalent Domino Pairs Number of Equivalent Domino Pairs	easy easy				1227
1130	cn us	Minimum Cost Tree From Leaf Values Minimum Cost Tree From Leaf Values	medium medium			✅	1228
1129	cn us	Shortest Path with Alternating Colors Shortest Path with Alternating Colors	medium medium				1229
1131	cn us	Maximum of Absolute Value Expression Maximum of Absolute Value Expression	medium medium				1230
1299	cn us	Replace Elements with Greatest Element on Right Side Replace Elements with Greatest Element on Right Side	easy easy				1231
1300	cn us	Sum of Mutated Array Closest to Target Sum of Mutated Array Closest to Target	medium medium				1232
1274	cn us	Number of Ships in a Rectangle Number of Ships in a Rectangle	hard hard		🔒 🔒		1233
1301	cn us	Number of Paths with Max Score Number of Paths with Max Score	hard hard				1234
1137	cn us	N-th Tribonacci Number N-th Tribonacci Number	easy easy				1236
1132	cn us	Reported Posts II Reported Posts II	medium medium		🔒 🔒		1237
1138	cn us	Alphabet Board Path Alphabet Board Path	medium medium				1238
1139	cn us	Largest 1-Bordered Square Largest 1-Bordered Square	medium medium				1239
1140	cn us	Stone Game II Stone Game II	medium medium				1240
1313	cn us	Decompress Run-Length Encoded List Decompress Run-Length Encoded List	easy easy			✅	1241
1314	cn us	Matrix Block Sum Matrix Block Sum	medium medium			✅	1242
1315	cn us	Sum of Nodes with Even-Valued Grandparent Sum of Nodes with Even-Valued Grandparent	medium medium			✅	1243
1316	cn us	Distinct Echo Substrings Distinct Echo Substrings	hard hard			✅	1244
1141	cn us	User Activity for the Past 30 Days I User Activity for the Past 30 Days I	easy easy		🔒 🔒		1245
1142	cn us	User Activity for the Past 30 Days II User Activity for the Past 30 Days II	easy easy		🔒 🔒		1246
1144	cn us	Decrease Elements To Make Array Zigzag Decrease Elements To Make Array Zigzag	medium medium				1247
1145	cn us	Binary Tree Coloring Game Binary Tree Coloring Game	medium medium				1248
1146	cn us	Snapshot Array Snapshot Array	medium medium			✅	1249
1143	cn us	Longest Common Subsequence Longest Common Subsequence	medium medium				1250
1147	cn us	Longest Chunked Palindrome Decomposition Longest Chunked Palindrome Decomposition	hard hard				1251
1328	cn us	Break a Palindrome Break a Palindrome	medium medium			✅	1252
1329	cn us	Sort the Matrix Diagonally Sort the Matrix Diagonally	medium medium			✅	1253
1302	cn us	Deepest Leaves Sum Deepest Leaves Sum	medium medium				1254
1330	cn us	Reverse Subarray To Maximize Array Value Reverse Subarray To Maximize Array Value	hard hard			✅	1255
1331	cn us	Rank Transform of an Array Rank Transform of an Array	easy easy			✅	1256
1148	cn us	Article Views I Article Views I	easy easy		🔒 🔒		1258
1149	cn us	Article Views II Article Views II	medium medium		🔒 🔒		1259
1154	cn us	Day of the Year Day of the Year	easy easy				1260
1156	cn us	Swap For Longest Repeated Character Substring Swap For Longest Repeated Character Substring	medium medium				1261
1157	cn us	Online Majority Element In Subarray Online Majority Element In Subarray	hard hard				1262
1155	cn us	Number of Dice Rolls With Target Sum Number of Dice Rolls With Target Sum	medium medium				1263
1171	cn us	Remove Zero Sum Consecutive Nodes from Linked List Remove Zero Sum Consecutive Nodes from Linked List	medium medium				1267
1158	cn us	Market Analysis I Market Analysis I	medium medium		🔒 🔒		1268
1159	cn us	Market Analysis II Market Analysis II	hard hard		🔒 🔒		1269
1172	cn us	Dinner Plate Stacks Dinner Plate Stacks	hard hard				1270
1236	cn us	Web Crawler Web Crawler	medium medium		🔒 🔒		1271
1169	cn us	Invalid Transactions Invalid Transactions	medium medium				1272
1170	cn us	Compare Strings by Frequency of the Smallest Character Compare Strings by Frequency of the Smallest Character	easy easy				1273
1360	cn us	Number of Days Between Two Dates Number of Days Between Two Dates	easy easy			✅	1274
1361	cn us	Validate Binary Tree Nodes Validate Binary Tree Nodes	medium medium			✅	1275
1362	cn us	Closest Divisors Closest Divisors	medium medium			✅	1276
1363	cn us	Largest Multiple of Three Largest Multiple of Three	hard hard			✅	1277
1164	cn us	Product Price at a Given Date Product Price at a Given Date	medium medium		🔒 🔒		1278
1175	cn us	Prime Arrangements Prime Arrangements	easy easy				1279
1176	cn us	Diet Plan Performance Diet Plan Performance	easy easy		🔒 🔒		1280
1177	cn us	Can Make Palindrome from Substring Can Make Palindrome from Substring	medium medium				1281
1178	cn us	Number of Valid Words for Each Puzzle Number of Valid Words for Each Puzzle	hard hard			✅	1282
1390	cn us	Four Divisors Four Divisors	medium medium			✅	1284
1382	cn us	Balance a Binary Search Tree Balance a Binary Search Tree	medium medium			✅	1285
1425	cn us	Constrained Subsequence Sum Constrained Subsequence Sum	hard hard			✅	1286
1184	cn us	Distance Between Bus Stops Distance Between Bus Stops	easy easy				1287
1186	cn us	Maximum Subarray Sum with One Deletion Maximum Subarray Sum with One Deletion	medium medium				1288
1185	cn us	Day of the Week Day of the Week	easy easy				1289
1187	cn us	Make Array Strictly Increasing Make Array Strictly Increasing	hard hard				1290
1173	cn us	Immediate Food Delivery I Immediate Food Delivery I	easy easy		🔒 🔒		1291
1174	cn us	Immediate Food Delivery II Immediate Food Delivery II	medium medium		🔒 🔒		1292
1483	cn us	Kth Ancestor of a Tree Node Kth Ancestor of a Tree Node	hard hard			✅	1296
1189	cn us	Maximum Number of Balloons Maximum Number of Balloons	easy easy				1297
1190	cn us	Reverse Substrings Between Each Pair of Parentheses Reverse Substrings Between Each Pair of Parentheses	medium medium				1298
1191	cn us	K-Concatenation Maximum Sum K-Concatenation Maximum Sum	medium medium			✅	1299
1192	cn us	Critical Connections in a Network Critical Connections in a Network	hard hard				1300
1179	cn us	Reformat Department Table Reformat Department Table	easy easy				1301
1405	cn us	Longest Happy String Longest Happy String	medium medium			✅	1304
1200	cn us	Minimum Absolute Difference Minimum Absolute Difference	easy easy				1306
1201	cn us	Ugly Number III Ugly Number III	medium medium				1307
1202	cn us	Smallest String With Swaps Smallest String With Swaps	medium medium				1308
1203	cn us	Sort Items by Groups Respecting Dependencies Sort Items by Groups Respecting Dependencies	hard hard				1309
1195	cn us	Fizz Buzz Multithreaded Fizz Buzz Multithreaded	medium medium				1316
1193	cn us	Monthly Transactions I Monthly Transactions I	medium medium		🔒 🔒		1317
1194	cn us	Tournament Winners Tournament Winners	hard hard		🔒 🔒		1318
1207	cn us	Unique Number of Occurrences Unique Number of Occurrences	easy easy				1319
1209	cn us	Remove All Adjacent Duplicates in String II Remove All Adjacent Duplicates in String II	medium medium				1320
1208	cn us	Get Equal Substrings Within Budget Get Equal Substrings Within Budget	medium medium				1321
1210	cn us	Minimum Moves to Reach Target with Rotations Minimum Moves to Reach Target with Rotations	hard hard				1322
1204	cn us	Last Person to Fit in the Elevator Last Person to Fit in the Elevator	medium medium		🔒 🔒		1327
1205	cn us	Monthly Transactions II Monthly Transactions II	medium medium		🔒 🔒		1328
1217	cn us	Play with Chips Play with Chips	easy easy				1329
1218	cn us	Longest Arithmetic Subsequence of Given Difference Longest Arithmetic Subsequence of Given Difference	medium medium				1330
1219	cn us	Path with Maximum Gold Path with Maximum Gold	medium medium				1331
1220	cn us	Count Vowels Permutation Count Vowels Permutation	hard hard				1332
1206	cn us	Design Skiplist Design Skiplist	hard hard				1337
1211	cn us	Queries Quality and Percentage Queries Quality and Percentage	easy easy		🔒 🔒		1338
1212	cn us	Team Scores in Football Tournament Team Scores in Football Tournament	medium medium		🔒 🔒		1339
1226	cn us	The Dining Philosophers The Dining Philosophers	medium medium				1340
1221	cn us	Split a String in Balanced Strings Split a String in Balanced Strings	easy easy				1341
1222	cn us	Queens That Can Attack the King Queens That Can Attack the King	medium medium				1342
1223	cn us	Dice Roll Simulation Dice Roll Simulation	medium medium				1343
1224	cn us	Maximum Equal Frequency Maximum Equal Frequency	hard hard				1344
1427	cn us	Perform String Shifts Perform String Shifts	easy easy		🔒 🔒		1345
1232	cn us	Check If It Is a Straight Line Check If It Is a Straight Line	easy easy			✅	1349
1233	cn us	Remove Sub-Folders from the Filesystem Remove Sub-Folders from the Filesystem	medium medium				1350
1234	cn us	Replace the Substring for Balanced String Replace the Substring for Balanced String	medium medium				1351
1235	cn us	Maximum Profit in Job Scheduling Maximum Profit in Job Scheduling	hard hard				1352
1225	cn us	Report Contiguous Dates Report Contiguous Dates	hard hard		🔒 🔒		1357
1237	cn us	Find Positive Integer Solution for a Given Equation Find Positive Integer Solution for a Given Equation	easy easy				1358
1238	cn us	Circular Permutation in Binary Representation Circular Permutation in Binary Representation	medium medium				1359
1239	cn us	Maximum Length of a Concatenated String with Unique Characters Maximum Length of a Concatenated String with Unique Characters	medium medium				1360
1240	cn us	Tiling a Rectangle with the Fewest Squares Tiling a Rectangle with the Fewest Squares	hard hard				1361
1227	cn us	Airplane Seat Assignment Probability Airplane Seat Assignment Probability	medium medium				1362
1429	cn us	First Unique Number First Unique Number	medium medium		🔒 🔒		1366
1242	cn us	Web Crawler Multithreaded Web Crawler Multithreaded	medium medium		🔒 🔒		1368
1247	cn us	Minimum Swaps to Make Strings Equal Minimum Swaps to Make Strings Equal	medium medium				1369
1248	cn us	Count Number of Nice Subarrays Count Number of Nice Subarrays	medium medium			✅	1370
1249	cn us	Minimum Remove to Make Valid Parentheses Minimum Remove to Make Valid Parentheses	medium medium				1371
1250	cn us	Check If It Is a Good Array Check If It Is a Good Array	hard hard				1372
1428	cn us	Leftmost Column with at Least a One Leftmost Column with at Least a One	medium medium		🔒 🔒		1374
1241	cn us	Number of Comments per Post Number of Comments per Post	easy easy		🔒 🔒		1377
1252	cn us	Cells with Odd Values in a Matrix Cells with Odd Values in a Matrix	easy easy				1378
1253	cn us	Reconstruct a 2-Row Binary Matrix Reconstruct a 2-Row Binary Matrix	medium medium			✅	1379
1254	cn us	Number of Closed Islands Number of Closed Islands	medium medium				1380
1255	cn us	Maximum Score Words Formed by Letters Maximum Score Words Formed by Letters	hard hard				1381
1260	cn us	Shift 2D Grid Shift 2D Grid	easy easy				1386
1261	cn us	Find Elements in a Contaminated Binary Tree Find Elements in a Contaminated Binary Tree	medium medium				1387
1262	cn us	Greatest Sum Divisible by Three Greatest Sum Divisible by Three	medium medium				1388
1263	cn us	Minimum Moves to Move a Box to Their Target Location Minimum Moves to Move a Box to Their Target Location	hard hard				1389
1251	cn us	Average Selling Price Average Selling Price	easy easy		🔒 🔒		1390
1426	cn us	Counting Elements Counting Elements	easy easy		🔒 🔒		1391
1266	cn us	Minimum Time Visiting All Points Minimum Time Visiting All Points	easy easy				1395
1267	cn us	Count Servers that Communicate Count Servers that Communicate	medium medium				1396
1268	cn us	Search Suggestions System Search Suggestions System	medium medium				1397
1269	cn us	Number of Ways to Stay in the Same Place After Some Steps Number of Ways to Stay in the Same Place After Some Steps	hard hard				1398
1264	cn us	Page Recommendations Page Recommendations	medium medium		🔒 🔒		1399
1275	cn us	Find Winner on a Tic Tac Toe Game Find Winner on a Tic Tac Toe Game	easy easy				1400
1276	cn us	Number of Burgers with No Waste of Ingredients Number of Burgers with No Waste of Ingredients	medium medium				1401
1277	cn us	Count Square Submatrices with All Ones Count Square Submatrices with All Ones	medium medium				1402
1278	cn us	Palindrome Partitioning III Palindrome Partitioning III	hard hard				1403
1265	cn us	Print Immutable Linked List in Reverse Print Immutable Linked List in Reverse	medium medium		🔒 🔒		1404
1270	cn us	All People Report to the Given Manager All People Report to the Given Manager	medium medium		🔒 🔒		1405
1281	cn us	Subtract the Product and Sum of Digits of an Integer Subtract the Product and Sum of Digits of an Integer	easy easy				1406
1282	cn us	Group the People Given the Group Size They Belong To Group the People Given the Group Size They Belong To	medium medium				1407
1283	cn us	Find the Smallest Divisor Given a Threshold Find the Smallest Divisor Given a Threshold	medium medium			✅	1408
1284	cn us	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	hard hard				1409
1279	cn us	Traffic Light Controlled Intersection Traffic Light Controlled Intersection	easy easy		🔒 🔒		1410
1290	cn us	Convert Binary Number in a Linked List to Integer Convert Binary Number in a Linked List to Integer	easy easy				1411
1292	cn us	Maximum Side Length of a Square with Sum Less than or Equal to Threshold Maximum Side Length of a Square with Sum Less than or Equal to Threshold	medium medium				1413
1293	cn us	Shortest Path in a Grid with Obstacles Elimination Shortest Path in a Grid with Obstacles Elimination	hard hard				1414
1280	cn us	Students and Examinations Students and Examinations	easy easy		🔒 🔒		1415
1285	cn us	Find the Start and End Number of Continuous Ranges Find the Start and End Number of Continuous Ranges	medium medium		🔒 🔒		1420
1295	cn us	Find Numbers with Even Number of Digits Find Numbers with Even Number of Digits	easy easy			✅	1421
1296	cn us	Divide Array in Sets of K Consecutive Numbers Divide Array in Sets of K Consecutive Numbers	medium medium			✅	1422
1297	cn us	Maximum Number of Occurrences of a Substring Maximum Number of Occurrences of a Substring	medium medium			✅	1423
1298	cn us	Maximum Candies You Can Get from Boxes Maximum Candies You Can Get from Boxes	hard hard			✅	1424
1294	cn us	Weather Type in Each Country Weather Type in Each Country	easy easy		🔒 🔒		1425
1304	cn us	Find N Unique Integers Sum up to Zero Find N Unique Integers Sum up to Zero	easy easy				1426
1305	cn us	All Elements in Two Binary Search Trees All Elements in Two Binary Search Trees	medium medium				1427
1306	cn us	Jump Game III Jump Game III	medium medium				1428
1307	cn us	Verbal Arithmetic Puzzle Verbal Arithmetic Puzzle	hard hard				1429
1430	cn us	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	medium medium		🔒 🔒		1432
1309	cn us	Decrypt String from Alphabet to Integer Mapping Decrypt String from Alphabet to Integer Mapping	easy easy				1434
1310	cn us	XOR Queries of a Subarray XOR Queries of a Subarray	medium medium				1435
1311	cn us	Get Watched Videos by Your Friends Get Watched Videos by Your Friends	medium medium				1436
1312	cn us	Minimum Insertion Steps to Make a String Palindrome Minimum Insertion Steps to Make a String Palindrome	hard hard				1437
1303	cn us	Find the Team Size Find the Team Size	easy easy		🔒 🔒		1438
1308	cn us	Running Total for Different Genders Running Total for Different Genders	medium medium		🔒 🔒		1439
1317	cn us	Convert Integer to the Sum of Two No-Zero Integers Convert Integer to the Sum of Two No-Zero Integers	easy easy			✅	1440
1318	cn us	Minimum Flips to Make a OR b Equal to c Minimum Flips to Make a OR b Equal to c	medium medium			✅	1441
1319	cn us	Number of Operations to Make Network Connected Number of Operations to Make Network Connected	medium medium			✅	1442
1320	cn us	Minimum Distance to Type a Word Using Two Fingers Minimum Distance to Type a Word Using Two Fingers	hard hard			✅	1443
1342	cn us	Number of Steps to Reduce a Number to Zero Number of Steps to Reduce a Number to Zero	easy easy			✅	1444
1343	cn us	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	medium medium			✅	1445
1344	cn us	Angle Between Hands of a Clock Angle Between Hands of a Clock	medium medium			✅	1446
1345	cn us	Jump Game IV Jump Game IV	hard hard			✅	1447
1323	cn us	Maximum 69 Number Maximum 69 Number	easy easy			✅	1448
1324	cn us	Print Words Vertically Print Words Vertically	medium medium			✅	1449
1325	cn us	Delete Leaves With a Given Value Delete Leaves With a Given Value	medium medium			✅	1450
1326	cn us	Minimum Number of Taps to Open to Water a Garden Minimum Number of Taps to Open to Water a Garden	hard hard			✅	1451
1321	cn us	Restaurant Growth Restaurant Growth	medium medium		🔒 🔒		1452
1322	cn us	Ads Performance Ads Performance	easy easy		🔒 🔒		1453
1332	cn us	Remove Palindromic Subsequences Remove Palindromic Subsequences	easy easy			✅	1454
1333	cn us	Filter Restaurants by Vegan-Friendly, Price and Distance Filter Restaurants by Vegan-Friendly, Price and Distance	medium medium			✅	1455
1334	cn us	Find the City With the Smallest Number of Neighbors at a Threshold Distance Find the City With the Smallest Number of Neighbors at a Threshold Distance	medium medium			✅	1456
1335	cn us	Minimum Difficulty of a Job Schedule Minimum Difficulty of a Job Schedule	hard hard			✅	1457
1356	cn us	Sort Integers by The Number of 1 Bits Sort Integers by The Number of 1 Bits	easy easy			✅	1458
1357	cn us	Apply Discount Every n Orders Apply Discount Every n Orders	medium medium			✅	1459
1358	cn us	Number of Substrings Containing All Three Characters Number of Substrings Containing All Three Characters	medium medium			✅	1460
1359	cn us	Count All Valid Pickup and Delivery Options Count All Valid Pickup and Delivery Options	hard hard			✅	1461
1327	cn us	List the Products Ordered in a Period List the Products Ordered in a Period	easy easy		🔒 🔒		1462
1337	cn us	The K Weakest Rows in a Matrix The K Weakest Rows in a Matrix	easy easy			✅	1463
1338	cn us	Reduce Array Size to The Half Reduce Array Size to The Half	medium medium			✅	1464
1339	cn us	Maximum Product of Splitted Binary Tree Maximum Product of Splitted Binary Tree	medium medium			✅	1465
1340	cn us	Jump Game V Jump Game V	hard hard			✅	1466
1336	cn us	Number of Transactions per Visit Number of Transactions per Visit	hard hard		🔒 🔒		1467
1346	cn us	Check If N and Its Double Exist Check If N and Its Double Exist	easy easy			✅	1468
1347	cn us	Minimum Number of Steps to Make Two Strings Anagram Minimum Number of Steps to Make Two Strings Anagram	medium medium			✅	1469
1348	cn us	Tweet Counts Per Frequency Tweet Counts Per Frequency	medium medium			✅	1470
1349	cn us	Maximum Students Taking Exam Maximum Students Taking Exam	hard hard			✅	1471
1370	cn us	Increasing Decreasing String Increasing Decreasing String	easy easy			✅	1472
1371	cn us	Find the Longest Substring Containing Vowels in Even Counts Find the Longest Substring Containing Vowels in Even Counts	medium medium			✅	1473
1372	cn us	Longest ZigZag Path in a Binary Tree Longest ZigZag Path in a Binary Tree	medium medium			✅	1474
1373	cn us	Maximum Sum BST in Binary Tree Maximum Sum BST in Binary Tree	hard hard			✅	1475
1351	cn us	Count Negative Numbers in a Sorted Matrix Count Negative Numbers in a Sorted Matrix	easy easy			✅	1476
1352	cn us	Product of the Last K Numbers Product of the Last K Numbers	medium medium			✅	1477
1353	cn us	Maximum Number of Events That Can Be Attended Maximum Number of Events That Can Be Attended	medium medium			✅	1478
1354	cn us	Construct Target Array With Multiple Sums Construct Target Array With Multiple Sums	hard hard			✅	1479
1341	cn us	Movie Rating Movie Rating	medium medium		🔒 🔒		1480
1350	cn us	Students With Invalid Departments Students With Invalid Departments	easy easy		🔒 🔒		1481
1365	cn us	How Many Numbers Are Smaller Than the Current Number How Many Numbers Are Smaller Than the Current Number	easy easy			✅	1482
1366	cn us	Rank Teams by Votes Rank Teams by Votes	medium medium			✅	1483
1367	cn us	Linked List in Binary Tree Linked List in Binary Tree	medium medium			✅	1484
1368	cn us	Minimum Cost to Make at Least One Valid Path in a Grid Minimum Cost to Make at Least One Valid Path in a Grid	hard hard			✅	1485
1385	cn us	Find the Distance Value Between Two Arrays Find the Distance Value Between Two Arrays	easy easy			✅	1486
1386	cn us	Cinema Seat Allocation Cinema Seat Allocation	medium medium			✅	1487
1387	cn us	Sort Integers by The Power Value Sort Integers by The Power Value	medium medium			✅	1488
1388	cn us	Pizza With 3n Slices Pizza With 3n Slices	hard hard			✅	1489
1374	cn us	Generate a String With Characters That Have Odd Counts Generate a String With Characters That Have Odd Counts	easy easy			✅	1490
1375	cn us	Bulb Switcher III Bulb Switcher III	medium medium			✅	1491
1376	cn us	Time Needed to Inform All Employees Time Needed to Inform All Employees	medium medium			✅	1492
1377	cn us	Frog Position After T Seconds Frog Position After T Seconds	hard hard			✅	1493
1355	cn us	Activity Participants Activity Participants	medium medium		🔒 🔒		1494
1364	cn us	Number of Trusted Contacts of a Customer Number of Trusted Contacts of a Customer	medium medium		🔒 🔒		1495
1380	cn us	Lucky Numbers in a Matrix Lucky Numbers in a Matrix	easy easy			✅	1496
1381	cn us	Design a Stack With Increment Operation Design a Stack With Increment Operation	medium medium			✅	1497
1379	cn us	Find a Corresponding Node of a Binary Tree in a Clone of That Tree Find a Corresponding Node of a Binary Tree in a Clone of That Tree	medium medium			✅	1498
1383	cn us	Maximum Performance of a Team Maximum Performance of a Team	hard hard			✅	1499
1399	cn us	Count Largest Group Count Largest Group	easy easy			✅	1500
1401	cn us	Circle and Rectangle Overlapping Circle and Rectangle Overlapping	medium medium			✅	1501
1400	cn us	Construct K Palindrome Strings Construct K Palindrome Strings	medium medium			✅	1502
1402	cn us	Reducing Dishes Reducing Dishes	hard hard			✅	1503
1369	cn us	Get the Second Most Recent Activity Get the Second Most Recent Activity	hard hard		🔒 🔒		1504
1389	cn us	Create Target Array in the Given Order Create Target Array in the Given Order	easy easy			✅	1505
1391	cn us	Check if There is a Valid Path in a Grid Check if There is a Valid Path in a Grid	medium medium			✅	1507
1392	cn us	Longest Happy Prefix Longest Happy Prefix	hard hard			✅	1508
1378	cn us	Replace Employee ID With The Unique Identifier Replace Employee ID With The Unique Identifier	easy easy		🔒 🔒		1509
1394	cn us	Find Lucky Integer in an Array Find Lucky Integer in an Array	easy easy			✅	1510
1395	cn us	Count Number of Teams Count Number of Teams	medium medium			✅	1511
1396	cn us	Design Underground System Design Underground System	medium medium			✅	1512
1397	cn us	Find All Good Strings Find All Good Strings	hard hard				1513
1413	cn us	Minimum Value to Get Positive Step by Step Sum Minimum Value to Get Positive Step by Step Sum	easy easy			✅	1514
1414	cn us	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	medium medium			✅	1515
1415	cn us	The k-th Lexicographical String of All Happy Strings of Length n The k-th Lexicographical String of All Happy Strings of Length n	medium medium			✅	1516
1416	cn us	Restore The Array Restore The Array	hard hard			✅	1517
1384	cn us	Total Sales Amount by Year Total Sales Amount by Year	hard hard		🔒 🔒		1518
1403	cn us	Minimum Subsequence in Non-Increasing Order Minimum Subsequence in Non-Increasing Order	easy easy			✅	1519
1404	cn us	Number of Steps to Reduce a Number in Binary Representation to One Number of Steps to Reduce a Number in Binary Representation to One	medium medium			✅	1520
1406	cn us	Stone Game III Stone Game III	hard hard			✅	1522
1393	cn us	Capital Gain/Loss Capital Gain/Loss	medium medium		🔒 🔒		1523
1408	cn us	String Matching in an Array String Matching in an Array	easy easy			✅	1524
1409	cn us	Queries on a Permutation With Key Queries on a Permutation With Key	medium medium			✅	1525
1410	cn us	HTML Entity Parser HTML Entity Parser	medium medium			✅	1526
1411	cn us	Number of Ways to Paint N × 3 Grid Number of Ways to Paint N × 3 Grid	hard hard			✅	1527
1431	cn us	Kids With the Greatest Number of Candies Kids With the Greatest Number of Candies	easy easy			✅	1528
1432	cn us	Max Difference You Can Get From Changing an Integer Max Difference You Can Get From Changing an Integer	medium medium			✅	1529
1433	cn us	Check If a String Can Break Another String Check If a String Can Break Another String	medium medium			✅	1530
1434	cn us	Number of Ways to Wear Different Hats to Each Other Number of Ways to Wear Different Hats to Each Other	hard hard			✅	1531
1417	cn us	Reformat The String Reformat The String	easy easy			✅	1532
1418	cn us	Display Table of Food Orders in a Restaurant Display Table of Food Orders in a Restaurant	medium medium			✅	1533
1419	cn us	Minimum Number of Frogs Croaking Minimum Number of Frogs Croaking	medium medium			✅	1534
1420	cn us	Build Array Where You Can Find The Maximum Exactly K Comparisons Build Array Where You Can Find The Maximum Exactly K Comparisons	hard hard			✅	1535
1398	cn us	Customers Who Bought Products A and B but Not C Customers Who Bought Products A and B but Not C	medium medium		🔒 🔒		1536
1422	cn us	Maximum Score After Splitting a String Maximum Score After Splitting a String	easy easy			✅	1537
1423	cn us	Maximum Points You Can Obtain from Cards Maximum Points You Can Obtain from Cards	medium medium			✅	1538
1424	cn us	Diagonal Traverse II Diagonal Traverse II	medium medium			✅	1539
1407	cn us	Top Travellers Top Travellers	easy easy		🔒 🔒		1541
1446	cn us	Consecutive Characters Consecutive Characters	easy easy			✅	1542
1447	cn us	Simplified Fractions Simplified Fractions	medium medium			✅	1543
1448	cn us	Count Good Nodes in Binary Tree Count Good Nodes in Binary Tree	medium medium			✅	1544
1449	cn us	Form Largest Integer With Digits That Add up to Target Form Largest Integer With Digits That Add up to Target	hard hard			✅	1545
1412	cn us	Find the Quiet Students in All Exams Find the Quiet Students in All Exams	hard hard		🔒 🔒		1546
1436	cn us	Destination City Destination City	easy easy			✅	1547
1437	cn us	Check If All 1's Are at Least Length K Places Away Check If All 1's Are at Least Length K Places Away	medium medium			✅	1548
1438	cn us	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	medium medium			✅	1549
1439	cn us	Find the Kth Smallest Sum of a Matrix With Sorted Rows Find the Kth Smallest Sum of a Matrix With Sorted Rows	hard hard			✅	1550
1421	cn us	NPV Queries NPV Queries	medium medium		🔒 🔒		1551
1441	cn us	Build an Array With Stack Operations Build an Array With Stack Operations	easy easy			✅	1552
1442	cn us	Count Triplets That Can Form Two Arrays of Equal XOR Count Triplets That Can Form Two Arrays of Equal XOR	medium medium			✅	1553
1443	cn us	Minimum Time to Collect All Apples in a Tree Minimum Time to Collect All Apples in a Tree	medium medium			✅	1554
1444	cn us	Number of Ways of Cutting a Pizza Number of Ways of Cutting a Pizza	hard hard			✅	1555
1460	cn us	Make Two Arrays Equal by Reversing Sub-arrays Make Two Arrays Equal by Reversing Sub-arrays	easy easy			✅	1556
1461	cn us	Check If a String Contains All Binary Codes of Size K Check If a String Contains All Binary Codes of Size K	medium medium			✅	1557
1462	cn us	Course Schedule IV Course Schedule IV	medium medium			✅	1558
1463	cn us	Cherry Pickup II Cherry Pickup II	hard hard			✅	1559
1450	cn us	Number of Students Doing Homework at a Given Time Number of Students Doing Homework at a Given Time	easy easy			✅	1560
1451	cn us	Rearrange Words in a Sentence Rearrange Words in a Sentence	medium medium			✅	1561
1452	cn us	People Whose List of Favorite Companies Is Not a Subset of Another List People Whose List of Favorite Companies Is Not a Subset of Another List	medium medium			✅	1562
1453	cn us	Maximum Number of Darts Inside of a Circular Dartboard Maximum Number of Darts Inside of a Circular Dartboard	hard hard			✅	1563
1435	cn us	Create a Session Bar Chart Create a Session Bar Chart	easy easy		🔒 🔒		1564
1440	cn us	Evaluate Boolean Expression Evaluate Boolean Expression	medium medium		🔒 🔒		1565
1455	cn us	Check If a Word Occurs As a Prefix of Any Word in a Sentence Check If a Word Occurs As a Prefix of Any Word in a Sentence	easy easy			✅	1566
1456	cn us	Maximum Number of Vowels in a Substring of Given Length Maximum Number of Vowels in a Substring of Given Length	medium medium			✅	1567
1457	cn us	Pseudo-Palindromic Paths in a Binary Tree Pseudo-Palindromic Paths in a Binary Tree	medium medium			✅	1568
1458	cn us	Max Dot Product of Two Subsequences Max Dot Product of Two Subsequences	hard hard			✅	1569
1475	cn us	Final Prices With a Special Discount in a Shop Final Prices With a Special Discount in a Shop	easy easy			✅	1570
1478	cn us	Allocate Mailboxes Allocate Mailboxes	hard hard			✅	1571
1476	cn us	Subrectangle Queries Subrectangle Queries	medium medium			✅	1572
1477	cn us	Find Two Non-overlapping Sub-arrays Each With Target Sum Find Two Non-overlapping Sub-arrays Each With Target Sum	medium medium			✅	1573
1464	cn us	Maximum Product of Two Elements in an Array Maximum Product of Two Elements in an Array	easy easy			✅	1574
1465	cn us	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	medium medium			✅	1575
1466	cn us	Reorder Routes to Make All Paths Lead to the City Zero Reorder Routes to Make All Paths Lead to the City Zero	medium medium			✅	1576
1467	cn us	Probability of a Two Boxes Having The Same Number of Distinct Balls Probability of a Two Boxes Having The Same Number of Distinct Balls	hard hard			✅	1577
1445	cn us	Apples & Oranges Apples & Oranges	medium medium		🔒 🔒		1578
1454	cn us	Active Users Active Users	medium medium		🔒 🔒		1579
1470	cn us	Shuffle the Array Shuffle the Array	easy easy			✅	1580
1471	cn us	The k Strongest Values in an Array The k Strongest Values in an Array	medium medium			✅	1581
1472	cn us	Design Browser History Design Browser History	medium medium			✅	1582
1473	cn us	Paint House III Paint House III	hard hard			✅	1583
1480	cn us	Running Sum of 1d Array Running Sum of 1d Array	easy easy			✅	1603
1481	cn us	Least Number of Unique Integers after K Removals Least Number of Unique Integers after K Removals	medium medium			✅	1604
1482	cn us	Minimum Number of Days to Make m Bouquets Minimum Number of Days to Make m Bouquets	medium medium			✅	1605
1459	cn us	Rectangles Area Rectangles Area	medium medium		🔒 🔒		1607
1468	cn us	Calculate Salaries Calculate Salaries	medium medium		🔒 🔒		1608
1469	cn us	Find All The Lonely Nodes Find All The Lonely Nodes	easy easy		🔒 🔒		1609
1486	cn us	XOR Operation in an Array XOR Operation in an Array	easy easy			✅	1610
1487	cn us	Making File Names Unique Making File Names Unique	medium medium			✅	1611
1488	cn us	Avoid Flood in The City Avoid Flood in The City	medium medium			✅	1612
1489	cn us	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	hard hard				1613
1474	cn us	Delete N Nodes After M Nodes of a Linked List Delete N Nodes After M Nodes of a Linked List	easy easy		🔒 🔒		1618
5452 1479	cn us	Sales by Day of the Week Sales by Day of the Week	hard hard		🔒 🔒		1623
1484 1485	cn us	Clone Binary Tree With Random Pointer Clone Binary Tree With Random Pointer	medium medium		🔒 🔒		1624
1485 1484	cn us	Group Sold Products By The Date Group Sold Products By The Date	easy easy		🔒 🔒		1625
1490	cn us	Clone N-ary Tree Clone N-ary Tree	medium medium		🔒 🔒		1634
LCP 02	cn	Deep Dark Fraction	easy				100092
LCP 04	cn	Broken Board Dominoes	hard				100093
LCP 05	cn	Coin Bonus	hard				100094
LCP 03	cn	Programmable Robot	medium				100096
LCP 01	cn	Guess Numbers	easy				100107
面试题 01.01	cn	Is Unique LCCI	easy				100158
面试题 01.02	cn	Check Permutation LCCI	easy				100159
面试题 01.03	cn	String to URL LCCI	easy				100160
面试题 01.06	cn	Compress String LCCI	easy			✅	100161
面试题 01.09	cn	String Rotation LCCI	easy				100162
面试题 02.01	cn	Remove Duplicate Node LCCI	easy				100163
面试题 02.06	cn	Palindrome Linked List LCCI	easy				100164
面试题 02.07	cn	Intersection of Two Linked Lists LCCI	easy				100167
面试题 02.08	cn	Linked List Cycle LCCI	medium				100168
面试题 03.02	cn	Min Stack LCCI	easy				100169
面试题 03.04	cn	Implement Queue using Stacks LCCI	easy				100170
面试题 04.01	cn	Route Between Nodes LCCI	medium				100171
面试题 03.01	cn	Three in One LCCI	easy				100172
面试题 03.05	cn	Sort of Stacks LCCI	medium				100173
面试题 04.02	cn	Minimum Height Tree LCCI	easy				100174
面试题 04.03	cn	List of Depth LCCI	medium				100175
面试题 04.04	cn	Check Balance LCCI	easy				100176
面试题 04.05	cn	Legal Binary Search Tree LCCI	medium				100177
面试题 04.06	cn	Successor LCCI	medium				100178
面试题 04.08	cn	First Common Ancestor LCCI	medium				100179
面试题 05.01	cn	Insert Into Bits LCCI	easy				100180
面试题 05.06	cn	Convert Integer LCCI	easy				100181
面试题 05.07	cn	Exchange LCCI	easy				100182
面试题 05.04	cn	Closed Number LCCI	medium				100183
面试题 01.04	cn	Palindrome Permutation LCCI	easy				100184
面试题 01.07	cn	Rotate Matrix LCCI	medium			✅	100185
面试题 01.08	cn	Zero Matrix LCCI	medium				100186
面试题 02.03	cn	Delete Middle Node LCCI	easy				100187
面试题 02.05	cn	Sum Lists LCCI	medium				100188
面试题 03.03	cn	Stack of Plates LCCI	medium				100195
面试题 05.08	cn	Draw Line LCCI	medium				100196
面试题 08.01	cn	Three Steps Problem LCCI	easy				100197
面试题 08.04	cn	Power Set LCCI	medium				100198
面试题 08.05	cn	Recursive Mulitply LCCI	medium				100199
面试题 08.09	cn	Bracket LCCI	medium				100200
面试题 08.10	cn	Color Fill LCCI	easy				100201
面试题 08.13	cn	Pile Box LCCI	hard				100202
面试题 05.02	cn	Bianry Number to String LCCI	medium				100203
面试题 03.06	cn	Animal Shelter LCCI	easy				100228
面试题 04.10	cn	Check SubTree LCCI	medium				100229
面试题 05.03	cn	Reverse Bits LCCI	easy				100230
面试题 08.11	cn	Coin LCCI	medium				100231
面试题 10.03	cn	Search Rotate Array LCCI	medium				100232
面试题 08.12	cn	Eight Queens LCCI	hard				100233
面试题 08.03	cn	Magic Index LCCI	easy				100240
面试题 08.07	cn	Permutation I LCCI	medium				100241
面试题 10.05	cn	Sparse Array Search LCCI	easy				100242
面试题 16.01	cn	Swap Numbers LCCI	medium				100258
面试题 16.02	cn	Words Frequency LCCI	medium				100259
面试题 16.03	cn	Intersection LCCI	hard				100260
面试题 16.04	cn	Tic-Tac-Toe LCCI	medium				100261
面试题 16.06	cn	Smallest Difference LCCI	medium				100262
剑指 Offer 09	cn	用两个栈实现队列 LCOF	easy				100273
剑指 Offer 10- I	cn	斐波那契数列 LCOF	easy				100274
剑指 Offer 03	cn	数组中重复的数字 LCOF	easy				100275
剑指 Offer 04	cn	二维数组中的查找 LCOF	easy				100276
剑指 Offer 10- II	cn	青蛙跳台阶问题 LCOF	easy				100277
剑指 Offer 11	cn	旋转数组的最小数字 LCOF	easy				100278
剑指 Offer 12	cn	矩阵中的路径 LCOF	medium				100279
剑指 Offer 05	cn	替换空格 LCOF	easy				100280
剑指 Offer 13	cn	机器人的运动范围 LCOF	medium				100281
剑指 Offer 06	cn	从尾到头打印链表 LCOF	easy				100282
剑指 Offer 07	cn	重建二叉树 LCOF	medium				100283
剑指 Offer 14- I	cn	剪绳子 LCOF	medium				100284
剑指 Offer 14- II	cn	剪绳子 II LCOF	medium				100285
剑指 Offer 25	cn	合并两个排序的链表 LCOF	easy				100286
剑指 Offer 26	cn	树的子结构 LCOF	medium				100287
剑指 Offer 27	cn	二叉树的镜像 LCOF	easy				100288
剑指 Offer 28	cn	对称的二叉树 LCOF	easy				100289
剑指 Offer 20	cn	表示数值的字符串 LCOF	medium				100290
剑指 Offer 21	cn	调整数组顺序使奇数位于偶数前面 LCOF	easy				100291
剑指 Offer 15	cn	二进制中1的个数 LCOF	easy				100292
剑指 Offer 29	cn	顺时针打印矩阵 LCOF	easy				100293
剑指 Offer 22	cn	链表中倒数第k个节点 LCOF	easy				100294
剑指 Offer 16	cn	数值的整数次方 LCOF	medium				100295
剑指 Offer 17	cn	打印从1到最大的n位数 LCOF	easy				100296
剑指 Offer 19	cn	正则表达式匹配 LCOF	hard				100297
剑指 Offer 24	cn	反转链表 LCOF	easy				100298
剑指 Offer 18	cn	删除链表的节点 LCOF	easy				100299
剑指 Offer 35	cn	复杂链表的复制 LCOF	medium				100300
剑指 Offer 40	cn	最小的k个数 LCOF	easy			✅	100301
剑指 Offer 30	cn	包含min函数的栈 LCOF	easy				100302
剑指 Offer 41	cn	数据流中的中位数 LCOF	hard				100303
剑指 Offer 42	cn	连续子数组的最大和 LCOF	easy				100304
剑指 Offer 36	cn	二叉搜索树与双向链表 LCOF	medium				100305
剑指 Offer 31	cn	栈的压入、弹出序列 LCOF	medium				100306
剑指 Offer 37	cn	序列化二叉树 LCOF	hard				100307
剑指 Offer 38	cn	字符串的排列 LCOF	medium				100308
剑指 Offer 43	cn	1～n整数中1出现的次数 LCOF	medium				100309
剑指 Offer 39	cn	数组中出现次数超过一半的数字 LCOF	easy				100310
剑指 Offer 32 - I	cn	从上到下打印二叉树 LCOF	medium				100311
剑指 Offer 32 - II	cn	从上到下打印二叉树 II LCOF	easy				100312
剑指 Offer 44	cn	数字序列中某一位的数字 LCOF	medium				100313
剑指 Offer 32 - III	cn	从上到下打印二叉树 III LCOF	medium				100314
剑指 Offer 33	cn	二叉搜索树的后序遍历序列 LCOF	medium				100315
剑指 Offer 50	cn	第一个只出现一次的字符 LCOF	easy				100316
剑指 Offer 34	cn	二叉树中和为某一值的路径 LCOF	medium				100317
剑指 Offer 51	cn	数组中的逆序对 LCOF	hard				100318
剑指 Offer 55 - I	cn	二叉树的深度 LCOF	easy				100319
剑指 Offer 56 - I	cn	数组中数字出现的次数 LCOF	medium				100320
剑指 Offer 56 - II	cn	数组中数字出现的次数 II LCOF	medium				100321
剑指 Offer 57	cn	和为s的两个数字 LCOF	easy				100322
剑指 Offer 45	cn	把数组排成最小的数 LCOF	medium				100323
剑指 Offer 57 - II	cn	和为s的连续正数序列 LCOF	easy			✅	100324
剑指 Offer 46	cn	把数字翻译成字符串 LCOF	medium				100325
剑指 Offer 52	cn	两个链表的第一个公共节点 LCOF	easy				100326
剑指 Offer 47	cn	礼物的最大价值 LCOF	medium				100327
剑指 Offer 58 - I	cn	翻转单词顺序 LCOF	easy				100328
剑指 Offer 53 - I	cn	在排序数组中查找数字 LCOF	easy				100329
剑指 Offer 58 - II	cn	左旋转字符串 LCOF	easy				100330
剑指 Offer 53 - II	cn	缺失的数字 LCOF	easy				100331
剑指 Offer 48	cn	最长不含重复字符的子字符串 LCOF	medium				100332
剑指 Offer 54	cn	二叉搜索树的第k大节点 LCOF	easy				100333
剑指 Offer 49	cn	丑数 LCOF	medium				100334
剑指 Offer 65	cn	不用加减乘除做加法 LCOF	easy				100335
剑指 Offer 59 - I	cn	滑动窗口的最大值 LCOF	easy				100336
剑指 Offer 59 - II	cn	队列的最大值 LCOF	medium			✅	100337
剑指 Offer 66	cn	构建乘积数组 LCOF	easy				100338
剑指 Offer 60	cn	n个骰子的点数 LCOF	easy				100339
剑指 Offer 67	cn	把字符串转换成整数 LCOF	medium				100340
剑指 Offer 61	cn	扑克牌中的顺子 LCOF	easy				100341
剑指 Offer 55 - II	cn	平衡二叉树 LCOF	easy				100342
剑指 Offer 62	cn	圆圈中最后剩下的数字 LCOF	easy			✅	100343
剑指 Offer 63	cn	股票的最大利润 LCOF	medium				100344
剑指 Offer 64	cn	求1+2+…+n LCOF	medium				100345
剑指 Offer 68 - I	cn	二叉搜索树的最近公共祖先 LCOF	easy				100346
剑指 Offer 68 - II	cn	二叉树的最近公共祖先 LCOF	easy				100347
面试题 08.08	cn	Permutation II LCCI	medium				100348
面试题 16.07	cn	Maximum LCCI	easy				100349
面试题 16.09	cn	Operations LCCI	medium				100350
面试题 16.10	cn	Living People LCCI	medium				100351
面试题 16.11	cn	Diving Board LCCI	easy				100352
面试题 16.13	cn	Bisect Squares LCCI	medium				100353
面试题 16.14	cn	Best Line LCCI	medium				100354
面试题 16.15	cn	Master Mind LCCI	easy				100355
面试题 16.16	cn	Sub Sort LCCI	medium				100356
面试题 16.17	cn	Contiguous Sequence LCCI	easy				1000003
面试题 16.18	cn	Pattern Matching LCCI	medium				1000004
面试题 16.19	cn	Pond Sizes LCCI	medium				1000005
面试题 01.05	cn	One Away LCCI	medium				1000006
面试题 02.02	cn	Kth Node From End of List LCCI	easy				1000007
面试题 02.04	cn	Partition List LCCI	medium				1000008
面试题 04.12	cn	Paths with Sum LCCI	medium				1000009
面试题 04.09	cn	BST Sequences LCCI	hard				1000010
面试题 08.02	cn	Robot in a Grid LCCI	medium				1000011
面试题 10.01	cn	Sorted Merge LCCI	easy			✅	1000012
面试题 10.11	cn	Peaks and Valleys LCCI	medium				1000013
面试题 08.06	cn	Hanota LCCI	easy				1000015
面试题 10.09	cn	Sorted Matrix Search LCCI	medium				1000016
面试题 16.05	cn	Factorial Zeros LCCI	easy				1000017
面试题 16.08	cn	English Int LCCI	hard				1000018
面试题 17.12	cn	BiNode LCCI	easy				1000019
面试题 17.13	cn	Re-Space LCCI	medium				1000020
面试题 17.14	cn	Smallest K LCCI	medium				1000021
面试题 17.15	cn	Longest Word LCCI	medium				1000022
面试题 17.16	cn	The Masseuse LCCI	easy			✅	1000023
面试题 17.17	cn	Multi Search LCCI	medium				1000024
面试题 17.01	cn	Add Without Plus LCCI	easy				1000025
面试题 16.25	cn	LRU Cache LCCI	medium				1000026
面试题 16.26	cn	Calculator LCCI	medium				1000027
面试题 17.20	cn	Continuous Median LCCI	hard				1000028
面试题 17.21	cn	Volume of Histogram LCCI	hard				1000029
面试题 17.22	cn	Word Transformer LCCI	medium				1000030
面试题 08.14	cn	Boolean Evaluation LCCI	medium				1000031
面试题 17.04	cn	Missing Number LCCI	easy				1000032
面试题 17.05	cn	Find Longest Subarray LCCI	medium				1000033
面试题 17.06	cn	Number Of 2s In Range LCCI	medium				1000034
面试题 17.07	cn	Baby Names LCCI	medium				1000035
面试题 17.08	cn	Circus Tower LCCI	medium				1000036
面试题 17.09	cn	Get Kth Magic Number LCCI	medium				1000037
面试题 17.10	cn	Find Majority Element LCCI	easy				1000038
面试题 17.11	cn	Find Closest LCCI	medium				1000039
面试题 10.02	cn	Group Anagrams LCCI	medium				1000040
面试题 10.10	cn	Rank from Stream LCCI	medium				1000041
面试题 16.24	cn	Pairs With Sum LCCI	medium				1000042
面试题 17.18	cn	Shortest Supersequence LCCI	medium				1000043
面试题 17.19	cn	Missing Two LCCI	hard				1000044
面试题 17.23	cn	Max Black Square LCCI	medium				1000045
面试题 17.24	cn	Max Submatrix LCCI	hard				1000046
面试题 16.20	cn	T9 LCCI	medium				1000047
面试题 16.21	cn	Sum Swap LCCI	medium				1000048
面试题 17.25	cn	Word Rectangle LCCI	hard				1000049
面试题 16.22	cn	Langtons Ant LCCI	medium				1000050
面试题 17.26	cn	Sparse Similarity LCCI	hard				1000051
LCP 06	cn	拿硬币	easy			✅	1000056
LCP 08	cn	剧情触发时间	medium				1000057
LCP 14	cn	切分数组	hard			❌	1000059
LCP 10	cn	二叉树任务调度	hard				1000062
LCP 07	cn	传递信息	easy				1000063
LCP 16	cn	游乐园的游览计划	hard				1000085
LCP 11	cn	期望个数统计	easy			✅	1000086
LCP 12	cn	小张刷题计划	medium			✅	1000087
LCP 15	cn	游乐园的迷宫	hard				1000088
LCP 09	cn	最小跳跃次数	hard				1000090
LCP 13	cn	寻宝	hard				1000093