NeetCode 150

1. Two Sum

Array Hash Table Easy

2. Add Two Numbers

Linked List Math Recursion Medium

3. Longest Substring Without Repeating Characters

Hash Table String Sliding Window Medium

5. Longest Palindromic Substring

Two Pointers String Dynamic Programming Medium

518. Coin Change II

Array Dynamic Programming Medium

7. Reverse Integer

Math Medium

1448. Count Good Nodes in Binary Tree

Tree Depth-First Search Breadth-First Search Binary Tree Medium

11. Container With Most Water

Array Two Pointers Greedy Medium

994. Rotting Oranges

Array Breadth-First Search Matrix Medium

15. 3Sum

Array Two Pointers Sorting Medium

17. Letter Combinations of a Phone Number

Hash Table String Backtracking Medium

20. Valid Parentheses

String Stack Easy

53. Maximum Subarray

Array Divide and Conquer Dynamic Programming Medium

55. Jump Game

Array Dynamic Programming Greedy Medium

56. Merge Intervals

Array Sorting Medium

66. Plus One

Array Math Easy

70. Climbing Stairs

Math Dynamic Programming Memoization Easy

104. Maximum Depth of Binary Tree

Tree Depth-First Search Breadth-First Search Binary Tree Easy

110. Balanced Binary Tree

Tree Depth-First Search Binary Tree Easy

121. Best Time to Buy and Sell Stock

Array Dynamic Programming Easy

125. Valid Palindrome

Two Pointers String Easy

139. Word Break

Array Hash Table String Dynamic Programming Trie Memoization Medium

141. Linked List Cycle

Hash Table Linked List Two Pointers Easy

146. LRU Cache

Hash Table Linked List Design Doubly-Linked List Medium

190. Reverse Bits

Divide and Conquer Bit Manipulation Easy

198. House Robber

Array Dynamic Programming Medium

199. Binary Tree Right Side View

Tree Depth-First Search Breadth-First Search Binary Tree Medium

200. Number of Islands

Array Depth-First Search Breadth-First Search Union-Find Matrix Medium

206. Reverse Linked List

Linked List Recursion Easy

215. Kth Largest Element in an Array

Array Divide and Conquer Sorting Heap (Priority Queue) Quickselect Medium

746. Min Cost Climbing Stairs

Array Dynamic Programming Easy

238. Product of Array Except Self

Array Prefix Sum Medium

704. Binary Search

Array Binary Search Easy

322. Coin Change

Array Dynamic Programming Breadth-First Search Medium