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

Showing 51-75 of 250 matching problems.

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Title	Difficulty	Topics
51. N-Queens Open source	Hard	ArrayBacktrackingAlgorithm X
52. N-Queens II Open source	Hard	BacktrackingAlgorithm X
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
58. Length of Last Word Open source	Easy	String
59. Spiral Matrix II Open source	Medium	ArrayMatrixSimulation
60. Permutation Sequence Open source	Hard	MathRecursion
61. Rotate List Open source	Medium	Linked ListTwo Pointers
62. Unique Paths Open source	Medium	MathDynamic ProgrammingCombinatorics
63. Unique Paths II Open source	Medium	ArrayDynamic ProgrammingMatrix
64. Minimum Path Sum Open source	Medium	ArrayDynamic ProgrammingMatrix
65. Valid Number Open source	Hard	String
66. Plus One Open source	Easy	ArrayMath
67. Add Binary Open source	Easy	MathStringBit Manipulation+1 more
68. Text Justification Open source	Hard	ArrayStringSimulation
69. Sqrt(x)Open source	Easy	MathBinary SearchNewton's Method
70. Climbing Stairs Open source	Easy	MathDynamic ProgrammingMemoization
71. Simplify Path Open source	Medium	StringStack
72. Edit Distance Open source	Medium	StringDynamic Programming
73. Set Matrix Zeroes Open source	Medium	ArrayHash TableMatrix
74. Search a 2D Matrix Open source	Medium	ArrayBinary SearchMatrix
75. Sort Colors Open source	Medium	ArrayTwo PointersSorting+2 more