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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 26-50 of 250 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
26. Remove Duplicates from Sorted ArrayOpen sourceEasy
27. Remove ElementOpen sourceEasy
28. Find the Index of the First Occurrence in a StringOpen sourceEasy
29. Divide Two IntegersOpen sourceMedium
30. Substring with Concatenation of All WordsOpen sourceHard
31. Next PermutationOpen sourceMedium
32. Longest Valid ParenthesesOpen sourceHard
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
38. Count and SayOpen sourceMedium
39. Combination SumOpen sourceMedium
40. Combination Sum IIOpen sourceMedium
41. First Missing PositiveOpen sourceHard
42. Trapping Rain WaterOpen sourceHard
43. Multiply StringsOpen sourceMedium
44. Wildcard MatchingOpen sourceHard
45. Jump Game IIOpen sourceMedium
46. PermutationsOpen sourceMedium
47. Permutations IIOpen sourceMedium
48. Rotate ImageOpen sourceMedium
49. Group AnagramsOpen sourceMedium
50. Pow(x, n)Open sourceMedium