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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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Showing 1-25 of 104 matching problems.

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All topicsAlgorithm XArrayBacktrackingBidirectional SearchBinary Indexed TreeBinary LiftingBinary SearchBinary Search TreeBinary TreeBit ManipulationBoyer–Moore Majority Vote AlgorithmBoyer–Moore String-Search AlgorithmBracket SequencesBreadth-First SearchBrute-Force SearchBubble SortBucket SortCombinatorics

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StatusTitleDifficulty
1. Two SumOpen sourceEasy
4. Median of Two Sorted ArraysOpen sourceHard
11. Container With Most WaterOpen sourceMedium
14. Longest Common PrefixOpen sourceEasy
15. 3SumOpen sourceMedium
16. 3Sum ClosestOpen sourceMedium
18. 4SumOpen sourceMedium
26. Remove Duplicates from Sorted ArrayOpen sourceEasy
27. Remove ElementOpen sourceEasy
31. Next PermutationOpen sourceMedium
33. Search in Rotated Sorted ArrayOpen sourceMedium
34. Find First and Last Position of Element in Sorted ArrayOpen sourceMedium
35. Search Insert PositionOpen sourceEasy
36. Valid SudokuOpen sourceMedium
37. Sudoku SolverOpen sourceHard
39. Combination SumOpen sourceMedium
40. Combination Sum IIOpen sourceMedium
41. First Missing PositiveOpen sourceHard
42. Trapping Rain WaterOpen sourceHard
45. Jump Game IIOpen sourceMedium
46. PermutationsOpen sourceMedium
47. Permutations IIOpen sourceMedium
48. Rotate ImageOpen sourceMedium
49. Group AnagramsOpen sourceMedium
51. N-QueensOpen sourceHard