Neetcode 150 Problems

This curated list contains 150 problems sorted by topic and difficulty to help you systematically grind and improve your problem-solving skills.

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Array

Easy

• 1. Two Sum
• 121. Best Time to Buy and Sell Stock
• 242. Valid Anagram
• 704. Binary Search
• 136. Single Number

Medium

• 33. Search in Rotated Sorted Array
• 238. Product of Array Except Self
• 153. Find Minimum in Rotated Sorted Array
• 43. Multiply Strings
• 45. Jump Game II

Hard

• 42. Trapping Rain Water

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String

Easy

• 125. Valid Palindrome
• 20. Valid Parentheses
• 242. Valid Anagram

Medium

• 3. Longest Substring Without Repeating Characters
• 76. Minimum Window Substring
• 22. Generate Parentheses
• 567. Permutation in String
• 424. Longest Repeating Character Replacement

Hard

• 10. Regular Expression Matching

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Linked List

Easy

• 21. Merge Two Sorted Lists
• 141. Linked List Cycle
• 206. Reverse Linked List

Medium

• 19. Remove Nth Node From End of List
• 138. Copy List with Random Pointer
• 143. Reorder List

Hard

• 23. Merge k Sorted Lists

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Tree

Easy

• 100. Same Tree
• 104. Maximum Depth of Binary Tree
• 206. Reverse Linked List

Medium

• 102. Binary Tree Level Order Traversal
• 98. Validate Binary Search Tree
• 230. Kth Smallest Element in a BST

Hard

• 124. Binary Tree Maximum Path Sum

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Dynamic Programming

Easy

• 70. Climbing Stairs

Medium

• 322. Coin Change
• 91. Decode Ways
• 198. House Robber

Hard

• 312. Burst Balloons

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Graph

Medium

• 133. Clone Graph
• 200. Number of Islands

Hard

• 329. Longest Increasing Path in a Matrix

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Matrix

Medium

• 54. Spiral Matrix

Hard

• 84. Largest Rectangle in Histogram

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Miscellaneous

Easy

• 278. First Bad Version
• 67. Add Binary
• 121. Best Time to Buy and Sell Stock

Medium

• 146. LRU Cache
• 16. 3Sum Closest
• 17. Letter Combinations of a Phone Number
• 56. Merge Intervals

Hard

• 1235. Maximum Profit in Job Scheduling

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This filtered list of problems is designed to help you focus on topics you may want to improve on. Keep grinding and challenge yourself with different difficulty levels!