Skip to main content

Leetcode 热门300

Pre Sum (hash map)
- 1. Two Sum
- 15. 3Sum
- 18. 4Sum
- 410. Split Array Largest Sum
- 560. Subarray Sum Equals K
Calculation
- 2. Add Two Numbers
- 13. Roman to Integer
- 31. Next Permutation
- 134. Gas Station
- 166. Fraction to Recurring Decimal
- 202. Happy Number
- 238. Product of Array Except Self
- 273. Integer to English Words
- 334. Increasing Triplet Subsequence
- 621. Task Scheduler
Monotonous Stack
- 42. Trapping Rain Water
- 84. Largest Rectangle in Histogram
- 85. Maximal Rectangle
- 456. 132 Pattern
- 735. Asteroid Collision
- 739. Daily Temperatures
Decode Stack / DFS
- 341. Flatten Nested List Iterator
- 394. Decode String
- 726. Number of Atoms
- 1087. Brace Expansion
Sort First
- 16. 3Sum Closest
- 56. Merge Intervals
- 57. Insert Interval
- 253. Meeting Rooms II
Matrix Loop
- 48. Rotate Image
- 54. Spiral Matrix
- 59. Spiral Matrix II
- 498. Diagonal Traverse
Trie Tree
- 208. Implement Trie (Prefix Tree)
- 211. Add and Search Word - Data structure design
Data Structure Design
- 146. LRU Cache
- 155. Min Stack
- 158. Read N Characters Given Read4 II - Call multiple times
- 173. Binary Search Tree Iterator
- 297. Serialize and Deserialize Binary Tree
- 449. Serialize and Deserialize BST
- 981. Time Based Key-Value Store
Hash map compare
- 49. Group Anagrams
Palindromic Substring
- 5. Longest Palindromic Substring
Merge Sort
- 4. Median of Two Sorted Arrays
- 21. Merge Two Sorted Lists
- 23. Merge k Sorted Lists
- 88. Merge Sorted Array
- 148. Sort List
Merge Combine Sort
- 315. Count of Smaller Numbers After Self
Two Pointer Slide window
- 3. Longest Substring Without Repeating Characters
- 76. Minimum Window Substring
- 159. Longest Substring with At Most Two Distinct Characters
- 209. Minimum Size Subarray Sum
- 340. Longest Substring with At Most K Distinct Characters
- 438. Find All Anagrams in a String
- 567. Permutation in String
- 727. Minimum Window Subsequence
Two Pointer
- 11. Container With Most Water
Heap (K elements)
- 215. Kth Largest Element in an Array
- 239. Sliding Window Maximum
- 347. Top K Frequent Elements
- 787. Cheapest Flights Within K Stops
- 973. K Closest Points to Origin
Multiple Heap
- 295. Find Median from Data Stream
Basic DFS
- 17. Letter Combinations of a Phone Number
- 22. Generate Parentheses
- 37. Sudoku Solver
- 39. Combination Sum
- 46. Permutations
- 78. Subsets
- 79. Word Search
- 200. Number of Islands
- 210. Course Schedule II
- 212. Word Search II
- 282. Expression Add Operators
- 322. Coin Change
- 403. Frog Jump
DFS Hard
- 51. N-Queens
- 140. Word Break II
- 489. Robot Room Cleaner
Basic BFS
- 64. Minimum Path Sum
- 126. Word Ladder II
- 207. Course Schedule
- 863. All Nodes Distance K in Binary Tree
Topological Sort
- 207. Course Schedule
- 210. Course Schedule II
- 269. Alien Dictionary
Basic Binary Search
- 33. Search in Rotated Sorted Array
- 34. Find First and Last Position of Element in Sorted Array
- 81. Search in Rotated Sorted Array II
- 153. Find Minimum in Rotated Sorted Array
- 154. Find Minimum in Rotated Sorted Array II
- 162. Find Peak Element
- 240. Search a 2D Matrix II
Binary Search Hard
- 214. Shortest Palindrome
- 287. Find the Duplicate Number
- 528. Random Pick with Weight
- 647. Palindromic Substrings
- 1055. Shortest Way to Form String
DP Stock
- 121. Best Time to Buy and Sell Stock
- 122. Best Time to Buy and Sell Stock II
- 123. Best Time to Buy and Sell Stock III
- 188. Best Time to Buy and Sell Stock IV
Basic DP
- 10. Regular Expression Matching
- 36. Valid Sudoku
- 44. Wildcard Matching
- 45. Jump Game II
- 62. Unique Paths
- 70. Climbing Stairs
- 91. Decode Ways
- 96. Unique Binary Search Trees
- 97. Interleaving String
- 128. Longest Consecutive Sequence
- 152. Maximum Product Subarray
- 139. Word Break
- 198. House Robber
- 221. Maximal Square
- 256. Paint House
- 300. Longest Increasing Subsequence
Swap Trick
- 41. First Missing Positive
- 75. Sort Colors
- 283. Move Zeroes
Random
- 528. Random Pick with Weight
Stack Basic
- 7. Reverse Integer
- 20. Valid Parentheses
- 150. Evaluate Reverse Polish Notation
- 224. Basic Calculator
- 227. Basic Calculator II
- 772. Basic Calculator III
Bruce Force
- 1007. Minimum Domino Rotations For Equal Row
Serialize and Deserialize
- 297. Serialize and Deserialize Binary Tree
Tree Recursion
- 124. Binary Tree Maximum Path Sum
- 236. Lowest Common Ancestor of a Binary Tree
- 543. Diameter of Binary Tree
- 834. Sum of Distances in Tree
Tree Non Recursion
- 116. Populating Next Right Pointers in Each Node
- 117. Populating Next Right Pointers in Each Node II
- 199. Binary Tree Right Side View
Validate Tree
- 98. Validate Binary Search Tree
Construct or recover Tree
- 99. Recover Binary Search Tree
- 105. Construct Binary Tree from Preorder and Inorder Traversal
- 109. Convert Sorted List to Binary Search Tree
Clone
- 138. Copy List with Random Pointer
- 133. Clone Graph