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Problem Library

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

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All tracksBlind 75NeetCode 150NeetCode 250Striver A to ZSDE Sheet

Showing 1-25 of 250 matching problems in NeetCode 250.

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All topics0-1 KnapsackAlgorithm XArrayBacktrackingBellman–Ford AlgorithmBidirectional SearchBinary LiftingBinary SearchBinary Search TreeBinary TreeBit ManipulationBitmaskBorůvka's AlgorithmBoyer–Moore Majority Vote AlgorithmBracket SequencesBreadth-First SearchBrute-Force SearchBubble Sort

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StatusTitleDifficulty
1. Two SumOpen sourceEasy
2. Add Two NumbersOpen sourceMedium
3. Longest Substring Without Repeating CharactersOpen sourceMedium
4. Median of Two Sorted ArraysOpen sourceHard
5. Longest Palindromic SubstringOpen sourceMedium
7. Reverse IntegerOpen sourceMedium
10. Regular Expression MatchingOpen sourceHard
11. Container With Most WaterOpen sourceMedium
13. Roman to IntegerOpen sourceEasy
14. Longest Common PrefixOpen sourceEasy
15. 3SumOpen sourceMedium
17. Letter Combinations of a Phone NumberOpen sourceMedium
18. 4SumOpen sourceMedium
19. Remove Nth Node From End of ListOpen sourceMedium
20. Valid ParenthesesOpen sourceEasy
21. Merge Two Sorted ListsOpen sourceEasy
22. Generate ParenthesesOpen sourceMedium
23. Merge k Sorted ListsOpen sourceHard
25. Reverse Nodes in k-GroupOpen sourceHard
26. Remove Duplicates from Sorted ArrayOpen sourceEasy
27. Remove ElementOpen sourceEasy
33. Search in Rotated Sorted ArrayOpen sourceMedium
35. Search Insert PositionOpen sourceEasy
36. Valid SudokuOpen sourceMedium
39. Combination SumOpen sourceMedium