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Leetcode
  • Introduction
  • 1.Two Sum
  • 2.Add Two Numbers
  • 3.Longest Substring Without Repeating Characters
  • 4.Median of Two Sorted Arrays
  • 5.Longest Palindromic Substring
  • 6.ZigZag Conversion
  • 7. Reverse Integer
  • 8. String to Integer (atoi)
  • 9. Palindrome Number
  • 10. Regular Expression Matching
  • 11. Container With Most Water
  • 12. Integer to Roman
  • 13. Roman to Integer
  • 14. Longest Common Prefix
  • 15. 3Sum
  • 16. 3Sum Closest
  • 17. Letter Combinations of a Phone Number
  • 18. 4Sum
  • 19. Remove Nth Node From End of List
  • 20. Valid Parentheses
  • 21. Merge Two Sorted Lists
  • 22. Generate Parentheses
  • 23. Merge k Sorted Lists
  • 24. Swap Nodes in Pairs
  • 25. Reverse Nodes in k-Group
  • 26. Remove Duplicates from Sorted Array
  • 27. Remove Element
  • 28. Implement strStr()
  • 29. Divide Two Integers
  • 30. Substring with Concatenation of All Words
  • 31. Next Permutation
  • 32. Longest Valid Parentheses
  • 33. Search in Rotated Sorted Array
  • 34. Search for a Range
  • 35. Search Insert Position
  • 36. Valid Sudoku
  • 37. Sudoku Solver
  • 38. Count and Say
  • 39. Combination Sum
  • 40. Combination Sum II
  • 41. First Missing Positive
  • 42. Trapping Rain Water
  • 43. Multiply Strings
  • 44. Wildcard Matching
  • 45. Jump Game II
  • 46. Permutations
  • 47. Permutations II
  • 48. Rotate Image
  • 49. Group Anagrams
  • 50. Pow(x, n)
  • 51. N-Queens
  • 52. N-Queens II
  • 53. Maximum Subarray
  • 54. Spiral Matrix
  • 55. Jump Game
  • 56. Merge Intervals
  • 57. Insert Interval
  • 58. Length of Last Word
  • 59. Spiral Matrix II
  • 60. Permutation Sequence
  • 61. Rotate List
  • 62. Unique Paths
  • 63. Unique Paths II
  • 64. Minimum Path Sum
  • 65. Valid Number
  • 66. Plus One
  • 67. Add Binary
  • 68. Text Justification
  • 69. Sqrt(x)
  • 70. Climbing Stairs
  • 71. Simplify Path
  • 72. Edit Distance
  • 73. Set Matrix Zeroes
  • 74. Search a 2D Matrix
  • 75. Sort Colors
  • 76. Minimum Window Substring
  • 77. Combinations
  • 78. Subsets
  • 79. Word Search
  • 80. Remove Duplicates from Sorted Array II
  • 81. Search in Rotated Sorted Array II
  • 82. Remove Duplicates from Sorted List II
  • 83. Remove Duplicates from Sorted List
  • 84. Largest Rectangle in Histogram
  • 85. Maximal Rectangle
  • 86. Partition List
  • 87. Scramble String
  • 88. Merge Sorted Array
  • 89. Gray Code
  • 90. Subsets II
  • 91. Decode Ways
  • 92. Reverse Linked List II
  • 93. Restore IP Addresses
  • 94. Binary Tree Inorder Traversal
  • 95. Unique Binary Search Trees II
  • 96. Unique Binary Search Trees
  • 97. Interleaving String
  • 98. Validate Binary Search Tree
  • 99. Recover Binary Search Tree
  • 100. Same Tree
  • 101. Symmetric Tree
  • 102. Binary Tree Level Order Traversal
  • 103. Binary Tree Zigzag Level Order Traversal
  • 104. Maximum Depth of Binary Tree
  • 105. Construct Binary Tree from Preorder and Inorder Traversal
  • 106. Construct Binary Tree from Inorder and Postorder Traversal
  • 107. Binary Tree Level Order Traversal II
  • 108. Convert Sorted Array to Binary Search Tree
  • 109. Convert Sorted List to Binary Search Tree
  • 110. Balanced Binary Tree
  • 111. Minimum Depth of Binary Tree
  • 112. Path Sum
  • 113. Path Sum II
  • 114. Flatten Binary Tree to Linked List
  • 115. Distinct Subsequences
  • 116. Populating Next Right Pointers in Each Node
  • 117. Populating Next Right Pointers in Each Node II
  • 118. Pascal's Triangle
  • 119. Pascal's Triangle II
  • 120. Triangle
  • 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
  • 124. Binary Tree Maximum Path Sum
  • 125. Valid Palindrome
  • 126. Word Ladder II
  • 127. Word Ladder
  • 128. Longest Consecutive Sequence
  • 129. Sum Root to Leaf Numbers
  • 130. Surrounded Regions
  • 131. Palindrome Partitioning
  • 132. Palindrome Partitioning II
  • 133. Clone Graph
  • 134. Gas Station
  • 135. Candy
  • 136. Single Number
  • 137. Single Number II
  • 138. Copy List with Random Pointer
  • 139. Word Break
  • 140. Word Break II
  • 141. Linked List Cycle
  • 142. Linked List Cycle II
  • 143. Reorder List
  • 144. Binary Tree Preorder Traversal
  • 145. Binary Tree Postorder Traversal
  • 146. LRU Cache
  • 147. Insertion Sort List
  • 148. Sort List
  • 149. Max Points on a Line
  • 150. Evaluate Reverse Polish Notation
  • 151. Reverse Words in a String
  • 152. Maximum Product Subarray
  • 153. Find Minimum in Rotated Sorted Array
  • 154. Find Minimum in Rotated Sorted Array II
  • 155. Min Stack
  • 156. Binary Tree Upside Down
  • 157. Read N Characters Given Read4
  • 158. Read N Characters Given Read4 II - Call multiple times
  • 159. Longest Substring with At Most Two Distinct Characters
  • 160. Intersection of Two Linked Lists
  • 161. One Edit Distance
  • 162. Find Peak Element
  • 163. Missing Ranges
  • 164. Maximum Gap
  • 165. Compare Version Numbers
  • 166. Fraction to Recurring Decimal
  • 167. Two Sum II - Input array is sorted
  • 168. Excel Sheet Column Title
  • 169. Majority Element
  • 170. Two Sum III - Data structure design
  • 171. Excel Sheet Column Number
  • 172. Factorial Trailing Zeroes
  • 173. Binary Search Tree Iterator
  • 174. Dungeon Game
  • 175. Combine Two Tables
  • 176. Second Highest Salary
  • 177. Nth Highest Salary
  • 178. Rank Scores
  • 179. Largest Number
  • 180. Consecutive Numbers
  • 181. Employees Earning More Than Their Managers
  • 182. Duplicate Emails
  • 183. Customers Who Never Order
  • 184. Department Highest Salary
  • 185. Department Top Three Salaries
  • 186. Reverse Words in a String II
  • 187. Repeated DNA Sequences
  • Page 8
  • 189. Rotate Array
  • 190. Reverse Bits
  • 191. Number of 1 Bits
  • 196. Delete Duplicate Emails
  • 197. Rising Temperature
  • 198. House Robber
  • 199. Binary Tree Right Side View
  • 200. Number of Islands
  • 201. Bitwise AND of Numbers Range
  • 202. Happy Number
  • 203. Remove Linked List Elements
  • 204. Count Primes
  • 205. Isomorphic Strings
  • 206. Reverse Linked List
  • 207. Course Schedule
  • 208. Implement Trie (Prefix Tree)
  • 209. Minimum Size Subarray Sum
  • 210. Course Schedule II
  • 211. Add and Search Word - Data structure design
  • 212. Word Search II
  • 213. House Robber II
  • 215. Kth Largest Element in an Array
  • 216. Combination Sum III
  • 217. Contains Duplicate
  • 219. Contains Duplicate II
  • 220. Contains Duplicate III
  • 221. Maximal Square
  • 222. Count Complete Tree Nodes
  • 223. Rectangle Area
  • 224. Basic Calculator
  • 225. Implement Stack using Queues
  • 226. Invert Binary Tree
  • 227. Basic Calculator II
  • 228. Summary Ranges
  • 229. Majority Element II
  • 230. Kth Smallest Element in a BST
  • 231. Power of Two
  • 232. Implement Queue using Stacks
  • 234. 234. Palindrome Linked List
  • 235. Lowest Common Ancestor of a Binary Search Tree
  • 236. Lowest Common Ancestor of a Binary Tree
  • 237. Delete Node in a Linked List
  • 238. Product of Array Except Self
  • 239. Sliding Window Maximum
  • 240. Search a 2D Matrix II
  • 241. Different Ways to Add Parentheses
  • 242. Valid Anagram
  • 243. Shortest Word Distance
  • 244. Shortest Word Distance II
  • 245. Shortest Word Distance III
  • 246. Strobogrammatic Number
  • 247. Strobogrammatic Number II
  • 248. Strobogrammatic Number III
  • 249. Group Shifted Strings
  • 250. Count Univalue Subtrees
  • 251. Flatten 2D Vector
  • 252. Meeting Rooms
  • 253. Meeting Rooms II
  • 254. Factor Combinations
  • 255. Verify Preorder Sequence in Binary Search Tree
  • 256. Paint House
  • 257. Binary Tree Paths
  • 258. Add Digits
  • 259. 3Sum Smaller
  • 260. Single Number III
  • 261. Graph Valid Tree
  • 262. Trips and Users
  • 263. Ugly Number
  • 264. Ugly Number II
  • 266. Palindrome Permutation
  • 267. Palindrome Permutation II
  • 268. Missing Number
  • 269. Alien Dictionary
  • 270. Closest Binary Search Tree Value
  • 271. Encode and Decode Strings
  • 272. Closest Binary Search Tree Value II
  • 274. H-Index
  • 275. H-Index II
  • 276. Paint Fence
  • 277. Find the Celebrity
  • 278. First Bad Version
  • 279. Perfect Squares
  • 280. Wiggle Sort
  • 281. Zigzag Iterator
  • 282. Expression Add Operators
  • 283.283. Move Zeroes
  • 284. Peeking Iterator
  • 285. Inorder Successor in BST
  • 286. Walls and Gates
  • 287. Find the Duplicate Number
  • 288. Unique Word Abbreviation
  • 289. Game of Life
  • 290. Word Pattern
  • 291. Word Pattern II
  • 292. Nim Game
  • 293. Flip Game
  • 294. Flip Game II
  • 295. Find Median from Data Stream
  • 296. Best Meeting Point
  • 297. Serialize and Deserialize Binary Tree
  • 298. Binary Tree Longest Consecutive Sequence
  • 299. Bulls and Cows
  • 300. Longest Increasing Subsequence
  • 301. Remove Invalid Parentheses
  • 302. Smallest Rectangle Enclosing Black Pixels
  • 303. Range Sum Query - Immutable
  • 304. Range Sum Query 2D - Immutable
  • 306. Additive Number
  • 307. Range Sum Query - Mutable
  • 310. Minimum Height Trees
  • 311. Sparse Matrix Multiplication
  • 312. Burst Balloons
  • 313. Super Ugly Number
  • 314. Binary Tree Vertical Order Traversal
  • 315. Count of Smaller Numbers After Self
  • 316. Remove Duplicate Letters
  • 318. Maximum Product of Word Lengths
  • 319. Bulb Switcher
  • 320. Generalized Abbreviation
  • 322. Coin Change
  • 323. Number of Connected Components in an Undirected Graph
  • 324. Wiggle Sort II
  • 325. Maximum Size Subarray Sum Equals k
  • 325. Maximum Size Subarray Sum Equals k
  • 326. Power of Three
  • 327. Count of Range Sum
  • 328. Odd Even Linked List
  • 329. Longest Increasing Path in a Matrix
  • 330. Patching Array
  • 331. Verify Preorder Serialization of a Binary Tree
  • 332. Reconstruct Itinerary
  • 333. Largest BST Subtree
  • 334. Increasing Triplet Subsequence
  • 335. Self Crossing
  • 336. Palindrome Pairs
  • 337. House Robber III
  • 338. Counting Bits
  • 339. Nested List Weight Sum
  • 340. Longest Substring with At Most K Distinct Characters
  • 341. Flatten Nested List Iterator
  • 342. Power of Four
  • 343. Integer Break
  • 344. Reverse String
  • 345. Reverse Vowels of a String
  • 346. Moving Average from Data Stream
  • 347. Top K Frequent Elements
  • 348. Design Tic-Tac-Toe
  • 349. Intersection of Two Arrays
  • 350. Intersection of Two Arrays II
  • 352. Data Stream as Disjoint Intervals
  • 353. Design Snake Game
  • 354. Russian Doll Envelopes
  • 355. Design Twitter
  • 356. Line Reflection
  • 357. Count Numbers with Unique Digits
  • 358. Rearrange String k Distance Apart
  • 359. Logger Rate Limiter
  • 360. Sort Transformed Array
  • 361. Bomb Enemy
  • 362. Design Hit Counter
  • 363. Max Sum of Rectangle No Larger Than K
  • 364. Nested List Weight Sum II
  • 365. Water and Jug Problem
  • 366. Find Leaves of Binary Tree
  • 367. Valid Perfect Square
  • 368. Largest Divisible Subset
  • 369. Plus One Linked List
  • 370. Range Addition
  • 371. Sum of Two Integers
  • 372. Super Pow
  • 373. Find K Pairs with Smallest Sums
  • 374. Guess Number Higher or Lower
  • 375. Guess Number Higher or Lower II
  • 376. Wiggle Subsequence
  • 377. Combination Sum IV
  • 380. Insert Delete GetRandom O(1)
  • 381. Insert Delete GetRandom O(1) - Duplicates allowed
  • 382. Linked List Random Node
  • 383. Ransom Note
  • 384. Shuffle an Array
  • 385. Mini Parser
  • 386. Third Maximum Number
  • 387. Permutation in String
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Introduction

Leetcode Solutions

Next1.Two Sum

Last updated 1 year ago

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