Problem Library

Master these coding challenges to ace your next technical interview. Handpicked problems with personalized spaced repetition.

All tracks Blind 75 NeetCode 150 NeetCode 250 Striver A to Z SDE Sheet

Showing 26-50 of 75 matching problems in Blind 75.

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All topics Array Backtracking Binary Lifting Binary Search Binary Search Tree Binary Tree Bit Manipulation Bracket Sequences Breadth-First Search Brute-Force Search Bucket Sort Combinatorics Complete Knapsack Counting Data Stream Depth-First Search Design Directed Acyclic Graph

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Array36String19Depth-First Search18

These are the topics showing up most often in your current queue.

Title	Difficulty	Topics
100. Same Tree Open source	Easy	TreeDepth-First SearchBreadth-First Search+1 more
102. Binary Tree Level Order Traversal Open source	Medium	TreeBreadth-First SearchBinary Tree
104. Maximum Depth of Binary Tree Open source	Easy	TreeDepth-First SearchBreadth-First Search+1 more
105. Construct Binary Tree from Preorder and Inorder Traversal Open source	Medium	ArrayHash TableDivide and Conquer+2 more
121. Best Time to Buy and Sell Stock Open source	Easy	ArrayDynamic Programming
124. Binary Tree Maximum Path Sum Open source	Hard	Dynamic ProgrammingTreeDepth-First Search+2 more
125. Valid Palindrome Open source	Easy	Two PointersString
128. Longest Consecutive Sequence Open source	Medium	ArrayHash TableUnion-Find
133. Clone Graph Open source	Medium	Hash TableDepth-First SearchBreadth-First Search+1 more
139. Word Break Open source	Medium	ArrayHash TableString+4 more
141. Linked List Cycle Open source	Easy	Hash TableLinked ListTwo Pointers+1 more
143. Reorder List Open source	Medium	Linked ListTwo PointersStack+1 more
152. Maximum Product Subarray Open source	Medium	ArrayDynamic Programming
153. Find Minimum in Rotated Sorted Array Open source	Medium	ArrayBinary Search
190. Reverse Bits Open source	Easy	Divide and ConquerBit Manipulation
191. Number of 1 Bits Open source	Easy	Divide and ConquerBit Manipulation
198. House Robber Open source	Medium	ArrayDynamic Programming
200. Number of Islands Open source	Medium	ArrayDepth-First SearchBreadth-First Search+2 more
206. Reverse Linked List Open source	Easy	Linked ListRecursion
207. Course Schedule Open source	Medium	Depth-First SearchBreadth-First SearchGraph Theory+2 more
208. Implement Trie (Prefix Tree)Open source	Medium	Hash TableStringDesign+1 more
211. Design Add and Search Words Data Structure Open source	Medium	StringDepth-First SearchDesign+1 more
212. Word Search II Open source	Hard	ArrayStringBacktracking+2 more
213. House Robber II Open source	Medium	ArrayDynamic Programming
217. Contains Duplicate Open source	Easy	ArrayHash TableSorting