🎯 VerveCopilot — Top 30 LeetCode Questions

Source: VerveCopilot — 30 Most Common LeetCode Questions

The 30 most frequently asked LeetCode questions across top tech companies. Master these and you'll have a strong foundation for any coding interview.

Question List

# Question Key Concept
1 Two Sum Hash Map
2 Valid Parentheses Stack
3 Merge Two Sorted Lists Linked List
4 Best Time to Buy and Sell Stock Greedy / DP
5 Reverse Linked List Linked List
6 Palindrome Number Math
7 Valid Anagram Hash Map / Sort
8 Contains Duplicate Hash Set
9 Fibonacci Number DP / Recursion
10 Climbing Stairs DP
11 Longest Substring Without Repeating Characters Sliding Window
12 3Sum Two Pointers
13 Group Anagrams Hash Map
14 Product of Array Except Self Prefix/Suffix
15 Number of Islands BFS / DFS
16 Validate Binary Search Tree BST / Inorder
17 Kth Smallest Element in a BST BST / Inorder
18 Word Break DP
19 Jump Game Greedy
20 Unique Paths DP
21 Coin Change DP
22 Spiral Matrix Array / Simulation
23 Subsets Backtracking
24 Pacific Atlantic Water Flow Graph / DFS/BFS
25 Rotting Oranges BFS
26 Course Schedule Graph / Topological Sort
27 Design HashMap Design
28 Merge k Sorted Lists Heap / Divide & Conquer
29 Binary Tree Maximum Path Sum Tree / DFS
30 LRU Cache Design / Hash Map + DLL

📁 Solutions

Solutions are available in the repo at:

Last updated: May 2026