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Code Snippets
  • Introduction
  • Ami's
    • Topics
      • Arrays
      • Bits & Operators
      • Graph
      • Heap
      • Linked List
      • Maths
      • Matrix
      • Queue
      • Recursion
        • Water and Jug Problem
      • Regular Expression
      • Searching
      • Sorting
      • Stack
      • String
      • Trees
  • leetcode
    • Problems
      • 1-100
        • 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
        • 12. Integer to Roman
        • 13. Roman to Integer
        • 15. 3Sum
        • 17. Letter Combinations of a Phone Number
        • 22. Generate Parentheses
        • 29. Divide Two Integers
        • 31. Next Permutation
        • 34. Find First and Last Position of Element in Sorted Array
        • 36. Valid Sudoku
        • 37. Sudoku Solver
        • 38. Count and Say
        • 43. Multiply Strings
        • 44. Wildcard Matching
        • 45. Jump Game II
        • 48. Rotate Image
        • 49. Group Anagrams
        • 51. N-Queens
        • 52. N-Queens II
        • 63. Unique Paths II
        • 65. Valid Number
        • 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
      • 101-200
        • 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
        • 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
        • 188. Best Time to Buy and Sell Stock IV
        • 189. Rotate Array
        • 190. Reverse Bits
        • 191. Number of 1 Bits
        • 192. Word Frequency
        • 193. Valid Phone Numbers
        • 194. Transpose File
        • 195. Tenth Line
        • 196. Delete Duplicate Emails
        • 197. Rising Temperature
        • 198. House Robber
        • 199. Binary Tree Right Side View
        • 200. Number of Islands
      • 201-300
        • 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. Design Add and Search Words Data Structure
        • 212. Word Search II
        • 213. House Robber II
        • 214. Shortest Palindrome
        • 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
        • 226. Invert Binary Tree
        • 234. Palindrome Linked List
        • 235. Lowest Common Ancestor of a Binary Search Tree
        • 236. Lowest Common Ancestor of a Binary Tree
        • 238. Product of Array Except Self
        • 240. Search a 2D Matrix II
        • 246. Strobogrammatic Number
        • 252. Meeting Rooms
        • 253. Meeting Rooms II
        • 257. Binary Tree Paths
        • 268. Missing Number
        • 273. Integer to English Words
        • 279. Perfect Squares
        • 285. Inorder Successor in BST
        • 289. Game of Life
        • 295. Find Median from Data Stream
        • 300. Longest Increasing Subsequence
      • 301-400
        • 304. Range Sum Query 2D - Immutable
        • 316. Remove Duplicate Letters
        • 318. Maximum Product of Word Lengths
        • 322. Coin Change
        • 323. Number of Connected Components in an Undirected Graph
        • 326. Power of Three
        • 329. Longest Increasing Path in a Matrix
        • 341. Flatten Nested List Iterator
        • 365. Water and Jug Problem
        • 376. Wiggle Subsequence
        • 377. Combination Sum IV
        • 384. Shuffle an Array
        • 387. First Unique Character in a String
      • 401-500
        • 402. Remove K Digits
        • 413. Arithmetic Slices
        • 417. Pacific Atlantic Water Flow
        • 423. Reconstruct Original Digits from English
        • 449. Serialize and Deserialize BST
        • 450. Delete Node in a BST
        • 452. Minimum Number of Arrows to Burst Balloons
        • 456. 132 Pattern
        • 462. Minimum Moves to Equal Array Elements II
        • 473. Matchsticks to Square
        • 478. Generate Random Point in a Circle
        • 482. License Key Formatting
        • 496. Next Greater Element I
      • 501-600
        • 503. Next Greater Element II
        • 509. Fibonacci Number
        • 524. Longest Word in Dictionary through Deleting
        • 535. Encode and Decode TinyURL
        • 536. Construct Binary Tree from String
        • 543. Diameter of Binary Tree
        • 545. Boundary of Binary Tree
        • 554. Brick Wall
        • 567. Permutation in String
        • 572. Subtree of Another Tree
        • 575. Distribute Candies
        • 581. Shortest Unsorted Continuous Subarray
        • 582. Kill Process
        • 583. Delete Operation for Two Strings
        • 589. N-ary Tree Preorder Traversal
      • 601-700
        • 609. Find Duplicate File in System
        • 611. Valid Triangle Number
        • 617. Merge Two Binary Trees
        • 621. Task Scheduler
        • 622. Design Circular Queue
        • 623. Add One Row to Tree
        • 630. Course Schedule III
        • 637. Average of Levels in Binary Tree
        • 645. Set Mismatch
        • 655. Print Binary Tree
        • 658. Find K Closest Elements
        • 665. Non-decreasing Array
        • 667. Beautiful Arrangement II
        • 695. Max Area of Island
      • 701-800
        • 702. Search in a Sorted Array of Unknown Size
        • 706. Design HashMap
        • 714. Best Time to Buy and Sell Stock with Transaction Fee
        • 718. Maximum Length of Repeated Subarray
        • 723. Candy Crush
        • 729. My Calendar I
        • 733. Flood Fill
        • 735. Asteroid Collision
        • 746. Min Cost Climbing Stairs
        • 759. Employee Free Time
        • 775. Global and Local Inversions
        • 784. Letter Case Permutation
        • 745. Prefix and Suffix Search
        • 791. Custom Sort String
      • 801-900
        • 814. Binary Tree Pruning
        • 816. Ambiguous Coordinates
        • 820. Short Encoding of Words
        • 821. Shortest Distance to a Character
        • 823. Binary Trees With Factors
        • 841. Keys and Rooms
        • 856. Score of Parentheses
        • 859. Buddy Strings
        • 869. Reordered Power of 2
        • 870. Advantage Shuffle
        • 871. Minimum Number of Refueling Stops
        • 887. Super Egg Drop
      • 901-1000
        • 901. Online Stock Span
        • 904. Fruit Into Baskets
        • 915. Partition Array into Disjoint Intervals
        • 916. Word Subsets
        • 923. 3Sum With Multiplicity
        • 929. Unique Email Addresses
        • 946. Validate Stack Sequences
        • 948. Bag of Tokens
        • 953. Verifying an Alien Dictionary
        • 968. Binary Tree Cameras
        • 970. Powerful Integers
        • 975. Odd Even Jump
        • 986. Interval List Intersections
        • 991. Broken Calculator
        • 994. Rotting Oranges
      • 1001-1100
        • 1007. Minimum Domino Rotations For Equal Row
        • 1026. Maximum Difference Between Node and Ancestor
        • 1048. Longest String Chain
      • 1101-1200
        • 1143. Longest Common Subsequence
        • 1151. Minimum Swaps to Group All 1's Together
        • 1165. Single-Row Keyboard
        • 1167. Minimum Cost to Connect Sticks
        • 1182. Shortest Distance to Target Color
        • 1198. Find Smallest Common Element in All Rows
      • 1201-1300
        • 1209. Remove All Adjacent Duplicates in String II
        • 1228. Missing Number In Arithmetic Progression
        • 1229. Meeting Scheduler
        • 1235. Maximum Profit in Job Scheduling
        • 1239. Maximum Length of a Concatenated String with Unique Characters
        • 1249. Minimum Remove to Make Valid Parentheses
        • 1275. Find Winner on a Tic Tac Toe Game
        • 1290. Convert Binary Number in a Linked List to Integer
      • 1301-1400
        • 1302. Deepest Leaves Sum
        • 1332. Remove Palindromic Subsequences
        • 1337. The K Weakest Rows in a Matrix
        • 1354. Construct Target Array With Multiple Sums
        • 1396. Design Underground System
      • 1401-1500
        • 1423. Maximum Points You Can Obtain from Cards
        • 1428. Leftmost Column with at Least a One
        • 1461. Check If a String Contains All Binary Codes of Size K
        • 1464. Maximum Product of Two Elements in an Array
        • 1480. Running Sum of 1d Array
        • 1492. The kth Factor of n
      • 1501-1600
        • 1551. Minimum Operations to Make Array Equal
        • 1564. Put Boxes Into the Warehouse I
      • 1601-1700
        • 1642. Furthest Building You Can Reach
        • 1644. Lowest Common Ancestor of a Binary Tree II
        • 1650. Lowest Common Ancestor of a Binary Tree III
        • 1676. Lowest Common Ancestor of a Binary Tree IV
        • 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
      • 1701-1800
        • 1704. Determine if String Halves Are Alike
        • 1721. Swapping Nodes in a Linked List
      • 1801-1900
        • 1848. Minimum Distance to the Target Element
        • 1870. Minimum Speed to Arrive on Time
      • 1901-2000
      • 2001-2100
        • 2006. Count Number of Pairs With Absolute Difference K
      • 2101-2200
  • Other
    • Template
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  1. leetcode
  2. Problems

1-100

LEETCODE

PreviousProblemsNext1. Two Sum

Last updated 3 years ago

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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
12. Integer to Roman
13. Roman to Integer
15. 3Sum
17. Letter Combinations of a Phone Number
22. Generate Parentheses
29. Divide Two Integers
31. Next Permutation
34. Find First and Last Position of Element in Sorted Array
36. Valid Sudoku
37. Sudoku Solver
38. Count and Say
43. Multiply Strings
44. Wildcard Matching
45. Jump Game II
48. Rotate Image
49. Group Anagrams
51. N-Queens
52. N-Queens II
63. Unique Paths II
65. Valid Number
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