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Problems

2,093 problems

Has videoPremium onlyReset
Array1,196Hash Table465String434Greedy327Math327Dynamic Programming324Sorting300Depth-First Search208Binary Search187Breadth-First Search165Matrix163Tree157Prefix Sum153Two Pointers148Database135All topics

Medium · With video · 2,093 results

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TitleSolutionAcceptDifficultyTopics
2. Add Two NumbersVideo
Solution49.3%Medium
Linked List, Math +1· 37 companies
3. Longest Substring Without Repeating CharactersVideo
Solution39.9%Medium
Hash Table, Sliding Window +1· 104 companies
5. Longest Palindromic SubstringVideo
Solution38.7%Medium
Dynamic Programming, String +1· 81 companies
6. Zigzag ConversionVideo
Solution54.9%Medium
String· 19 companies
7. Reverse IntegerVideo
Solution32.2%Medium
Math· 22 companies
8. String to Integer (atoi)Video
Solution21.4%Medium
String· 21 companies
11. Container With Most WaterVideo
Solution60.9%Medium
Array, Greedy +1· 57 companies
12. Integer to RomanVideo
Solution71.8%Medium
Hash Table, Math +1· 31 companies
15. 3SumVideo
Solution40.1%Medium
Array, Sorting +1· 57 companies
16. 3Sum ClosestVideo
Solution47.4%Medium
Array, Sorting +1· 11 companies
17. Letter Combinations of a Phone NumberVideo
Solution66.9%Medium
Backtracking, Hash Table +1· 34 companies
18. 4SumVideo
Solution42.0%Medium
Array, Sorting +1· 20 companies
19. Remove Nth Node From End of ListVideo
Solution52.4%Medium
Linked List, Two Pointers· 18 companies
22. Generate ParenthesesVideo
Solution79.6%Medium
Backtracking, Dynamic Programming +1· 40 companies
24. Swap Nodes in PairsVideo
Solution70.3%Medium
Linked List, Recursion· 13 companies
29. Divide Two IntegersVideo
Solution20.1%Medium
Bit Manipulation, Math· 8 companies
31. Next PermutationVideo
Solution46.1%Medium
Array, Two Pointers· 31 companies
33. Search in Rotated Sorted ArrayVideo
Solution45.5%Medium
Array, Binary Search· 53 companies
34. Find First and Last Position of Element in Sorted ArrayVideo
Solution49.7%Medium
Array, Binary Search· 29 companies
36. Valid SudokuVideo
Solution64.9%Medium
Array, Hash Table +1· 26 companies
38. Count and SayVideo
Solution63.7%Medium
String· 13 companies
39. Combination SumVideo
Solution76.9%Medium
Array, Backtracking· 26 companies
40. Combination Sum IIVideo
Solution60.3%Medium
Array, Backtracking· 15 companies
43. Multiply StringsVideo
Solution44.4%Medium
Math, Simulation +1· 17 companies
45. Jump Game IIVideo
Solution43.2%Medium
Array, Dynamic Programming +1· 26 companies
46. PermutationsVideo
Solution82.3%Medium
Array, Backtracking· 25 companies
47. Permutations IIVideo
Solution64.3%Medium
Array, Backtracking· 9 companies
48. Rotate ImageVideo
Solution80.7%Medium
Array, Math +1· 36 companies
49. Group AnagramsVideo
Solution73.0%Medium
Array, Hash Table +2· 87 companies
50. Pow(x, n)Video
Solution39.0%Medium
Math, Recursion· 22 companies
53. Maximum SubarrayVideo
Solution53.7%Medium
Array, Divide and Conquer +1· 64 companies
54. Spiral MatrixVideo
Solution58.2%Medium
Array, Matrix +1· 49 companies
55. Jump GameVideo
Solution41.2%Medium
Array, Dynamic Programming +1· 33 companies
56. Merge IntervalsVideo
Solution52.6%Medium
Array, Sorting· 112 companies
57. Insert IntervalVideo
Solution46.1%Medium
Array· 16 companies
59. Spiral Matrix IIVideo
Solution76.0%Medium
Array, Matrix +1· 11 companies
61. Rotate ListVideo
Solution43.1%Medium
Linked List, Two Pointers· 9 companies
62. Unique PathsVideo
Solution67.3%Medium
Combinatorics, Dynamic Programming +1· 21 companies
63. Unique Paths IIVideo
Solution44.9%Medium
Array, Dynamic Programming +1· 9 companies
64. Minimum Path SumVideo
Solution68.6%Medium
Array, Dynamic Programming +1· 17 companies
71. Simplify PathVideo
Solution51.4%Medium
Stack, String· 24 companies
72. Edit DistanceVideo
Solution61.5%Medium
Dynamic Programming, String· 24 companies
73. Set Matrix ZeroesVideo
Solution63.8%Medium
Array, Hash Table +1· 22 companies
74. Search a 2D MatrixVideo
Solution54.4%Medium
Array, Binary Search +1· 19 companies
75. Sort ColorsVideo
Solution69.9%Medium
Array, Sorting +1· 37 companies
77. CombinationsVideo
Solution74.9%Medium
Backtracking· 8 companies
78. SubsetsVideo
Solution82.7%Medium
Array, Backtracking +1· 21 companies
79. Word SearchVideo
Solution48.2%Medium
Array, Backtracking +2· 36 companies
80. Remove Duplicates from Sorted Array IIVideo
Solution65.0%Medium
Array, Two Pointers· 9 companies
81. Search in Rotated Sorted Array IIVideo
Solution40.4%Medium
Array, Binary Search· 10 companies
Showing 1–50 of 2,093