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 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
1. Two Sum Open source	Easy	ArrayHash Table
3. Longest Substring Without Repeating Characters Open source	Medium	Hash TableStringSliding Window
5. Longest Palindromic Substring Open source	Medium	Two PointersStringDynamic Programming+1 more
11. Container With Most Water Open source	Medium	ArrayTwo PointersGreedy
15. 3Sum Open source	Medium	ArrayTwo PointersSorting
19. Remove Nth Node From End of List Open source	Medium	Linked ListTwo Pointers
20. Valid Parentheses Open source	Easy	StringStackBracket Sequences
21. Merge Two Sorted Lists Open source	Easy	Linked ListRecursion
23. Merge k Sorted Lists Open source	Hard	Linked ListDivide and ConquerHeap (Priority Queue)+2 more
33. Search in Rotated Sorted Array Open source	Medium	ArrayBinary Search
39. Combination Sum Open source	Medium	ArrayBacktracking
48. Rotate Image Open source	Medium	ArrayMathMatrix
49. Group Anagrams Open source	Medium	ArrayHash TableString+1 more
53. Maximum Subarray Open source	Medium	ArrayDivide and ConquerDynamic Programming
54. Spiral Matrix Open source	Medium	ArrayMatrixSimulation
55. Jump Game Open source	Medium	ArrayDynamic ProgrammingGreedy
56. Merge Intervals Open source	Medium	ArraySortingQuicksort
57. Insert Interval Open source	Medium	Array
62. Unique Paths Open source	Medium	MathDynamic ProgrammingCombinatorics
70. Climbing Stairs Open source	Easy	MathDynamic ProgrammingMemoization
73. Set Matrix Zeroes Open source	Medium	ArrayHash TableMatrix
76. Minimum Window Substring Open source	Hard	Hash TableStringSliding Window
79. Word Search Open source	Medium	ArrayStringBacktracking+2 more
91. Decode Ways Open source	Medium	StringDynamic Programming
98. Validate Binary Search Tree Open source	Medium	TreeDepth-First SearchBinary Search Tree+1 more