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

Showing 26-50 of 250 matching problems in NeetCode 250.

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Title	Difficulty	Topics
40. Combination Sum II Open source	Medium	ArrayBacktracking
41. First Missing Positive Open source	Hard	ArrayHash Table
42. Trapping Rain Water Open source	Hard	ArrayTwo PointersDynamic Programming+2 more
43. Multiply Strings Open source	Medium	MathStringSimulation
45. Jump Game II Open source	Medium	ArrayDynamic ProgrammingGreedy
46. Permutations Open source	Medium	ArrayBacktracking
47. Permutations II Open source	Medium	ArrayBacktrackingSorting
48. Rotate Image Open source	Medium	ArrayMathMatrix
49. Group Anagrams Open source	Medium	ArrayHash TableString+1 more
50. Pow(x, n)Open source	Medium	MathRecursion
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
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
66. Plus One Open source	Easy	ArrayMath
67. Add Binary Open source	Easy	MathStringBit Manipulation+1 more
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