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 1-25 of 34 matching problems in Striver A to Z.

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Array34Dynamic Programming15Depth-First Search11

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

Title	Difficulty	Topics
1. Two Sum Open source	Easy	ArrayHash Table
15. 3Sum Open source	Medium	ArrayTwo PointersSorting
18. 4Sum Open source	Medium	ArrayTwo PointersSorting
31. Next Permutation Open source	Medium	ArrayTwo Pointers
33. Search in Rotated Sorted Array Open source	Medium	ArrayBinary Search
42. Trapping Rain Water Open source	Hard	ArrayTwo PointersDynamic Programming+2 more
48. Rotate Image Open source	Medium	ArrayMathMatrix
53. Maximum Subarray Open source	Medium	ArrayDivide and ConquerDynamic Programming
54. Spiral Matrix Open source	Medium	ArrayMatrixSimulation
56. Merge Intervals Open source	Medium	ArraySortingQuicksort
57. Insert Interval Open source	Medium	Array
73. Set Matrix Zeroes Open source	Medium	ArrayHash TableMatrix
79. Word Search Open source	Medium	ArrayStringBacktracking+2 more
118. Pascal's Triangle Open source	Easy	ArrayDynamic Programming
121. Best Time to Buy and Sell Stock Open source	Easy	ArrayDynamic Programming
122. Best Time to Buy and Sell Stock II Open source	Medium	ArrayDynamic ProgrammingGreedy
128. Longest Consecutive Sequence Open source	Medium	ArrayHash TableUnion-Find
152. Maximum Product Subarray Open source	Medium	ArrayDynamic Programming
153. Find Minimum in Rotated Sorted Array Open source	Medium	ArrayBinary Search
167. Two Sum II - Input Array Is Sorted Open source	Medium	ArrayTwo PointersBinary Search
169. Majority Element Open source	Easy	ArrayHash TableDivide and Conquer+3 more
198. House Robber Open source	Medium	ArrayDynamic Programming
200. Number of Islands Open source	Medium	ArrayDepth-First SearchBreadth-First Search+2 more
213. House Robber II Open source	Medium	ArrayDynamic Programming
229. Majority Element II Open source	Medium	ArrayHash TableSorting+2 more