LeetCode Answers | LeetCode答案

LeetCode Answers | LeetCode答案

# Question Difficulty
726 Number of Atoms Hard
720 Longest Word in Dictionary Easy
395 Longest Substring with At Least K Repeating Characters Medium
351 Android Unlock Patterns Medium
533 Lonely Pixel II Medium
531 Lonely Pixel I Medium
354 Russian Doll Envelopes Hard
663 Equal Tree Partition Medium
661 Image Smoother Easy
657 Judge Route Circle Easy
654 Maximum Binary Tree Medium
653 Two Sum IV - Input is a BST Easy
650 2 Keys Keyboard Medium
648 Replace Words Medium
645 Set Mismatch Easy
643 Maximum Average Subarray I Easy
637 Average of Levels in Binary Tree Easy
633 Sum of Square Numbers Easy
628 Maximum Product of Three Numbers Easy
627 Swap Salary Easy
625 Minimum Factorization Medium
624 Maximum Distance in Arrays Easy
620 Not Boring Movies Easy
619 Biggest Single Number Easy
617 Merge Two Binary Trees Easy
616 Add Bold Tag in String Medium
613 Shortest Distance in a Line Easy
610 Triangle Judgement Easy
607 Sales Person Easy
606 Construct String from Binary Tree Easy
605 Can Place Flowers Easy
604 Design Compressed String Iterator Easy
603 Consecutive Available Seats Easy
599 Minimum Index Sum of Two Lists Easy
598 Range Addition II Easy
597 Friend Requests I: Overall Acceptance Rate Easy
596 Classes More Than 5 Students Easy
595 Big Countries Easy
594 Longest Harmonious Subsequence Easy
586 Customer Placing the Largest Number of Orders Easy
584 Find Customer Referee Easy
583 Delete Operation for Two Strings Medium
581 Shortest Unsorted Continuous Subarray Easy
580 Count Student Number in Departments Medium
577 Employee Bonus Easy
575 Distribute Candies Easy
572 Subtree of Another Tree Easy
570 Managers with at Least 5 Direct Reports Medium
566 Reshape the Matrix Easy
563 Binary Tree Tilt Easy
562 Longest Line of Consecutive One in Matrix Medium
561 Array Partition I Easy
560 Subarray Sum Equals K Medium
551 Student Attendance Record I Easy
548 Split Array with Equal Sum Medium
543 Diameter of Binary Tree Easy
539 Minimum Time Difference Medium
538 Convert BST to Greater Tree Easy
537 Complex Number Multiplication Medium
535 Encode and Decode TinyURL Medium
532 K-diff Pairs in an Array Easy
530 Minimum Absolute Difference in BST Easy
526 Beautiful Arrangement Medium
525 Contiguous Array Medium
524 Longest Word in Dictionary through Deleting Medium
521 Longest Uncommon Subsequence I Easy
515 Find Largest Value in Each Tree Row Medium
507 Perfect Number Easy
506 Relative Ranks Easy
503 Next Greater Element II Medium
501 Find Mode in Binary Search Tree Easy
500 Keyboard Row Easy
496 Next Greater Element I Easy
492 Construct the Rectangle Easy
486 Predict the Winner Medium
479 Largest Palindrome Product Easy
477 Total Hamming Distance Medium
468 Validate IP Address Medium
463 Island Perimeter Easy
459 Repeated Substring Pattern Easy
458 Poor Pigs Easy
455 Assign Cookies Easy
454 4Sum II Medium
453 Minimum Moves to Equal Array Elements Easy
448 Find All Numbers Disappeared in an Array Easy
447 Number of Boomerangs Easy
442 Find All Duplicates in an Array Medium
441 Arranging Coins Easy
438 Find All Anagrams in a String Easy
437 Path Sum III Easy
435 Non-overlapping Intervals Medium
434 Number of Segments in a String Easy
422 Valid Word Square Easy
415 Add Strings Easy
414 Third Maximum Number Easy
413 Arithmetic Slices Medium
412 Fizz Buzz Easy
409 Longest Palindrome Easy
408 Valid Word Abbreviation Easy
405 Convert a Number to Hexadecimal Easy
404 Sum of Left Leaves Easy
402 Remove K Digits Medium
401 Binary Watch Easy
392 Is Subsequence Medium
389 Find the Difference Easy
557 Reverse Words in a String III Easy
542 01 Matrix Medium
541 Reverse String II Easy
520 Detect Capital Easy
504 Base 7 Easy
485 Max Consecutive Ones Easy
476 Number Complement Easy
461 Hamming Distance Easy
394 Decode String Medium
387 First Unique Character in a String Easy
383 Ransom Note Easy
374 Guess Number Higher or Lower Easy
371 Sum of Two Integers Easy
369 Plus One Linked List Medium
367 Valid Perfect Square Easy
362 Design Hit Counter Medium
359 Logger Rate Limiter Easy
350 Intersection of Two Arrays II Easy
349 Intersection of Two Arrays Easy
347 Top K Frequent Elements Medium
346 Moving Average from Data Stream Easy
345 Reverse Vowels of a String Easy
344 Reverse String Easy
343 Integer Break Medium
342 Power of Four Easy
341 Flatten Nested List Iterator Medium
340 Longest Substring with At Most K Distinct Characters Hard
339 Nested List Weight Sum Easy
338 Counting Bits Medium
336 Palindrome Pairs Hard
332 Reconstruct Itinerary Medium
331 Verify Preorder Serialization of a Binary Tree Medium
330 Patching Array Hard
328 Odd Even Linked List Medium
326 Power of Three Easy
325 Maximum Size Subarray Sum Equals k Medium
319 Bulb Switcher Medium
316 Remove Duplicate Letters Hard
313 Super Ugly Number Medium
311 Sparse Matrix Multiplication Medium
306 Additive Number Medium
304 Range Sum Query 2D - Immutable Medium
303 Range Sum Query - Immutable Easy
299 Bulls and Cows Medium
298 Binary Tree Longest Consecutive Sequence Medium
293 Flip Game Easy
292 Nim Game Easy
290 Word Pattern Easy
288 Unique Word Abbreviation Medium
287 Find the Duplicate Number Medium
283 Move Zeroes Easy
281 Zigzag Iterator Medium
280 Wiggle Sort Medium
278 First Bad Version Easy
276 Paint Fence Easy
273 Integer to English Words Hard
272 Closest Binary Search Tree Value II Hard
271 Encode and Decode Strings Medium
270 Closest Binary Search Tree Value Easy
269 Alien Dictionary Hard
268 Missing Number Easy
267 Palindrome Permutation II Medium
266 Palindrome Permutation Easy
265 Paint House II Hard
264 Ugly Number II Medium
263 Ugly Number Easy
261 Graph Valid Tree Medium
260 Single Number III Medium
259 3Sum Smaller Medium
258 Add Digits Easy
257 Binary Tree Paths Easy
256 Paint House Medium
255 Verify Preorder Sequence in Binary Search Tree Medium
254 Factor Combinations Medium
253 Meeting Rooms II Medium
252 Meeting Rooms Easy
251 Flatten 2D Vector Medium
250 Count Univalue Subtrees Medium
249 Group Shifted Strings Easy
248 Strobogrammatic Number III Medium
247 Strobogrammatic Number II Medium
246 Strobogrammatic Number Easy
245 Shortest Word Distance III Medium
244 Shortest Word Distance II Medium
243 Shortest Word Distance Easy
242 Valid Anagram Easy
241 Different Ways to Add Parentheses Medium
240 Search a 2D Matrix II Medium
239 Sliding Window Maximum Hard
238 Product of Array Except Self Medium
237 Delete Node in a Linked List Easy
236 Lowest Common Ancestor of a Binary Tree Medium
235 Lowest Common Ancestor of a Binary Search Tree Easy
234 Palindrome Linked List Easy
233 Number of Digit One Medium
232 Implement Queue using Stacks Easy
231 Power of Two Easy
230 Kth Smallest Element in a BST Medium
229 Majority Element II Medium
228 Summary Ranges Easy
227 Basic Calculator II Medium
226 Invert Binary Tree Easy
225 Implement Stack using Queues Medium
224 Basic Calculator - [Reverse Polish Notation] Medium
223 Rectangle Area Easy
222 Count Complete Tree Nodes Medium
221 Maximal Square Medium
220 Contains Duplicate III Medium
219 Contains Duplicate II Easy
218 The Skyline Problem Hard
217 Contains Duplicate Easy
216 Combination Sum III Medium
215 Kth Largest Element in an Array Medium
214 Shortest Palindrome Hard
213 House Robber II Medium
212 Word Search II Hard
211 Add and Search Word - Data structure design Medium
210 Course Schedule II Medium
209 Minimum Size Subarray Sum Medium
208 Implement Trie (Prefix Tree) Medium
207 Course Schedule Medium
206 Reverse Linked List Easy
205 Isomorphic Strings Easy
204 Count Primes Easy
203 Remove Linked List Elements Easy
202 Happy Number Easy
201 Bitwise AND of Numbers Range Medium
200 Number of Islands Medium
199 Binary Tree Right Side View Medium
198 House Robber Easy
191 Number of 1 Bits Easy
190 Reverse Bits Easy
189 Rotate Array Easy
188 Best Time to Buy and Sell Stock IV Hard
187 Repeated DNA Sequences Medium
186 Reverse Words in a String II Medium
179 Largest Number Medium
174 Dungeon Game Hard
173 Binary Search Tree Iterator Medium
172 Factorial Trailing Zeroes Easy
171 Excel Sheet Column Number Easy
170 Two Sum III - Data structure design Easy
169 Majority Element Easy
168 Excel Sheet Column Title Easy
167 Two Sum II - Input array is sorted Medium
166 Fraction to Recurring Decimal Medium
165 Compare Version Numbers Easy
164 Maximum Gap Hard
163 Missing Ranges Medium
162 Find Peak Element Medium
161 One Edit Distance Medium
160 Intersection of Two Linked Lists Easy
159 Longest Substring with At Most Two Distinct Characters Hard
158 Read N Characters Given Read4 II - Call multiple times Hard
157 Read N Characters Given Read4 Easy
156 Binary Tree Upside Down Medium
155 Min Stack Easy
154 Find Minimum in Rotated Sorted Array II Hard
153 Find Minimum in Rotated Sorted Array Medium
152 Maximum Product Subarray Medium
151 Reverse Words in a String Medium
150 Evaluate Reverse Polish Notation Medium
149 Max Points on a Line Hard
148 Sort List Medium
147 Insertion Sort List Medium
146 LRU Cache Hard
145 Binary Tree Postorder Traversal Hard
144 Binary Tree Preorder Traversal Medium
143 Reorder List Medium
142 Linked List Cycle II Medium
141 Linked List Cycle Medium
140 Word Break II Hard
139 Word Break Medium
138 Copy List with Random Pointer Hard
137 Single Number II Medium
136 Single Number Medium
135 Candy Hard
134 Gas Station Medium
133 Clone Graph Medium
132 Palindrome Partitioning II Hard
131 Palindrome Partitioning Medium
130 Surrounded Regions Medium
129 Sum Root to Leaf Numbers Medium
128 Longest Consecutive Sequence Hard
127 Word Ladder Medium
126 Word Ladder II Hard
125 Valid Palindrome Easy
124 Binary Tree Maximum Path Sum Hard
123 Best Time to Buy and Sell Stock III Hard
122 Best Time to Buy and Sell Stock II Medium
121 Best Time to Buy and Sell Stock Medium
120 Triangle Medium
119 Pascal’s Triangle II Easy
118 Pascal’s Triangle Easy
117 Populating Next Right Pointers in Each Node II Hard
116 Populating Next Right Pointers in Each Node Medium
115 Distinct Subsequences Hard
114 Flatten Binary Tree to Linked List Medium
113 Path Sum II Medium
112 Path Sum Easy
111 Minimum Depth of Binary Tree Easy
110 Balanced Binary Tree Easy
109 Convert Sorted List to Binary Search Tree Medium
108 Convert Sorted Array to Binary Search Tree Medium
107 Binary Tree Level Order Traversal II Easy
106 Construct Binary Tree from Inorder and Postorder Traversal Medium
105 Construct Binary Tree from Preorder and Inorder Traversal Medium
104 Maximum Depth of Binary Tree Easy
103 Binary Tree Zigzag Level Order Traversal Medium
102 Binary Tree Level Order Traversal Easy
101 Symmetric Tree Easy
100 Same Tree Easy
99 Recover Binary Search Tree Hard
98 Validate Binary Search Tree Medium
97 Interleaving String Hard
96 Unique Binary Search Trees Medium
95 Unique Binary Search Trees II Medium
94 Binary Tree Inorder Traversal Medium
93 Restore IP Addresses Medium
92 Reverse Linked List II Medium
91 Decode Ways Medium
90 Subsets II Medium
89 Gray Code Medium
88 Merge Sorted Array Easy
87 Scramble String Hard
86 Partition List Medium
85 Maximal Rectangle Hard
84 Largest Rectangle in Histogram Hard
83 Remove Duplicates from Sorted List Easy
82 Remove Duplicates from Sorted List II Medium
81 Search in Rotated Sorted Array II Medium
80 Remove Duplicates from Sorted Array II Medium
79 Word Search Medium
78 Subsets Medium
77 Combinations Medium
76 Minimum Window Substring Hard
75 Sort Colors Medium
74 Search a 2D Matrix Medium
73 Set Matrix Zeroes Medium
72 Edit Distance Hard
71 Simplify Path Medium
70 Climbing Stairs Easy
69 Sqrt(x) Medium
68 Text Justification Hard
67 Add Binary Easy
66 Plus One Easy
65 Valid Number Hard
64 Minimum Path Sum Medium
63 Unique Paths II Medium
62 Unique Paths Medium
61 Rotate List Medium
60 Permutation Sequence Medium
59 Spiral Matrix II Medium
58 Length of Last Word Easy
57 Insert Interval Hard
56 Merge Intervals Hard
55 Jump Game Medium
54 Spiral Matrix Medium
53 Maximum Subarray Medium
52 N-Queens II Hard
51 N-Queens Hard
50 Pow(x, n) Medium
49 Anagrams Medium
48 Rotate Image Medium
47 Permutations II Hard
46 Permutations Medium
45 Jump Game II Hard
44 Wildcard Matching Hard
43 Multiply Strings Medium
42 Trapping Rain Water Hard
41 First Missing Positive Hard
40 Combination Sum II Medium
39 Combination Sum Medium
38 Count and Say Easy
37 Sudoku Solver Hard
36 Valid Sudoku Easy
35 Search Insert Position Medium
34 Search for a Range Medium
33 Search in Rotated Sorted Array Hard
32 Longest Valid Parentheses Hard
31 Next Permutation Medium
30 Substring with Concatenation of All Words Hard
29 Divide Two Integers Medium
28 Implement strStr() Easy
27 Remove Element Easy
26 Remove Duplicates from Sorted Array Easy
25 Reverse Nodes in k-Group Hard
24 Swap Nodes in Pairs Medium
23 Merge k Sorted Lists Hard
22 Generate Parentheses Medium
21 Merge Two Sorted Lists Easy
20 Valid Parentheses Easy
19 Remove Nth Node From End of List Easy
18 4Sum Medium
17 Letter Combinations of a Phone Number Medium
16 3Sum Closest Medium
15 3Sum Medium
14 Longest Common Prefix Easy
13 Roman to Integer Easy
12 Integer to Roman Medium
11 Container With Most Water Medium
10 Regular Expression Matching Hard
9 Palindrome Number Easy
8 String to Integer (atoi) Easy
7 Reverse Integer Easy
6 ZigZag Conversion Easy
5 Longest Palindromic Substring Medium
4 Median of Two Sorted Arrays Hard
3 Longest Substring Without Repeating Characters Medium
2 Add Two Numbers Medium
1 Two Sum Medium