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Top 100 Liked Questions

Hand-picked questions by the community for coding interview preparation.

100Backtracking

17. Letter Combinations of a Phone Number
SolutionMEDIUM
22. Generate Parentheses
SolutionMEDIUM
39. Combination Sum
SolutionMEDIUM
46. Permutations
SolutionMEDIUM
51. N-Queens
SolutionHARD
78. Subsets
SolutionMEDIUM
79. Word Search
SolutionMEDIUM
131. Palindrome Partitioning
SolutionMEDIUM

100Binary Search

4. Median of Two Sorted Arrays
SolutionHARD
33. Search in Rotated Sorted Array
SolutionMEDIUM
34. Find First and Last Position of Element in Sorted Array
SolutionMEDIUM
35. Search Insert Position
SolutionEASY
74. Search a 2D Matrix
SolutionMEDIUM
124. Binary Tree Maximum Path Sum
SolutionHARD
153. Find Minimum in Rotated Sorted Array
SolutionMEDIUM

100Binary Tree

94. Binary Tree Inorder Traversal
SolutionEASY
98. Validate Binary Search Tree
SolutionMEDIUM
101. Symmetric Tree
SolutionEASY
102. Binary Tree Level Order Traversal
SolutionMEDIUM
104. Maximum Depth of Binary Tree
SolutionEASY
105. Construct Binary Tree from Preorder and Inorder Traversal
SolutionMEDIUM
108. Convert Sorted Array to Binary Search Tree
SolutionEASY
114. Flatten Binary Tree to Linked List
SolutionMEDIUM
199. Binary Tree Right Side View
SolutionMEDIUM
226. Invert Binary Tree
SolutionEASY
230. Kth Smallest Element in a BST
SolutionMEDIUM
236. Lowest Common Ancestor of a Binary Tree
SolutionMEDIUM
437. Path Sum III
SolutionMEDIUM
543. Diameter of Binary Tree
SolutionEASY

100Dynamic Programming

5. Longest Palindromic Substring
SolutionMEDIUM
32. Longest Valid Parentheses
SolutionHARD
62. Unique Paths
SolutionMEDIUM
64. Minimum Path Sum
SolutionMEDIUM
70. Climbing Stairs
SolutionEASY
72. Edit Distance
SolutionMEDIUM
118. Pascal's Triangle
SolutionEASY
139. Word Break
SolutionMEDIUM
152. Maximum Product Subarray
SolutionMEDIUM
198. House Robber
SolutionMEDIUM
279. Perfect Squares
SolutionMEDIUM
300. Longest Increasing Subsequence
SolutionMEDIUM
322. Coin Change
SolutionMEDIUM
416. Partition Equal Subset Sum
SolutionMEDIUM
1250. Longest Common Subsequence
SolutionMEDIUM

100Graph

200. Number of Islands
SolutionMEDIUM
207. Course Schedule
SolutionMEDIUM
1036. Rotting Oranges
SolutionMEDIUM

100Greedy

45. Jump Game II
SolutionMEDIUM
55. Jump Game
SolutionMEDIUM
121. Best Time to Buy and Sell Stock
SolutionEASY
768. Partition Labels
SolutionMEDIUM

100Hashing

1. Two Sum
SolutionEASY
49. Group Anagrams
SolutionMEDIUM
128. Longest Consecutive Sequence
SolutionMEDIUM
560. Subarray Sum Equals K
SolutionMEDIUM

100Heap

215. Kth Largest Element in an Array
SolutionMEDIUM
295. Find Median from Data Stream
SolutionHARD
347. Top K Frequent Elements
SolutionMEDIUM

100Linked Lists

2. Add Two Numbers
SolutionMEDIUM
19. Remove Nth Node From End of List
SolutionMEDIUM
21. Merge Two Sorted Lists
SolutionEASY
23. Merge k Sorted Lists
SolutionHARD
24. Swap Nodes in Pairs
SolutionMEDIUM
25. Reverse Nodes in k-Group
SolutionHARD
138. Copy List with Random Pointer
SolutionMEDIUM
141. Linked List Cycle
SolutionEASY
142. Linked List Cycle II
SolutionMEDIUM
146. LRU Cache
SolutionMEDIUM
148. Sort List
SolutionMEDIUM
160. Intersection of Two Linked Lists
SolutionEASY
206. Reverse Linked List
SolutionEASY
234. Palindrome Linked List
SolutionEASY

100Matrix

48. Rotate Image
SolutionMEDIUM
54. Spiral Matrix
SolutionMEDIUM
73. Set Matrix Zeroes
SolutionMEDIUM
240. Search a 2D Matrix II
SolutionMEDIUM

100Sliding Window

3. Longest Substring Without Repeating Characters
SolutionMEDIUM
76. Minimum Window Substring
SolutionHARD
239. Sliding Window Maximum
SolutionHARD
438. Find All Anagrams in a String
SolutionMEDIUM

100Stack

20. Valid Parentheses
SolutionEASY
84. Largest Rectangle in Histogram
SolutionHARD
155. Min Stack
SolutionMEDIUM
394. Decode String
SolutionMEDIUM
739. Daily Temperatures
SolutionMEDIUM

100Two Pointers

11. Container With Most Water
SolutionMEDIUM
15. 3Sum
SolutionMEDIUM
42. Trapping Rain Water
SolutionHARD
283. Move Zeroes
SolutionEASY

100Trie

208. Implement Trie (Prefix Tree)
SolutionMEDIUM

100Misc

31. Next Permutation
SolutionMEDIUM
41. First Missing Positive
SolutionHARD
53. Maximum Subarray
SolutionMEDIUM
56. Merge Intervals
SolutionMEDIUM
75. Sort Colors
SolutionMEDIUM
136. Single Number
SolutionEASY
169. Majority Element
SolutionEASY
189. Rotate Array
SolutionMEDIUM
238. Product of Array Except Self
SolutionMEDIUM
287. Find the Duplicate Number
SolutionMEDIUM

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