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Problems

4,005 problems

Has videoPremium onlyReset
Array2,209String870Hash Table786Math682Dynamic Programming666Sorting504Greedy480Binary Search352Depth-First Search335Database303Bit Manipulation283Matrix278Tree261Breadth-First Search255Two Pointers249All topics

With video · 4,005 results

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TitleSolutionAcceptDifficultyTopics
1. Two SumVideo
Solution57.8%Easy
Array, Hash Table· 127 companies
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
4. Median of Two Sorted ArraysVideo
Solution47.9%Hard
Array, Binary Search +1· 45 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
9. Palindrome NumberVideo
Solution61.0%Easy
Math· 31 companies
10. Regular Expression MatchingVideo
Solution31.8%Hard
Dynamic Programming, Recursion +1· 25 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
13. Roman to IntegerVideo
Solution67.0%Easy
Hash Table, Math +1· 36 companies
14. Longest Common PrefixVideo
Solution48.6%Easy
String, Trie· 60 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
20. Valid ParenthesesVideo
Solution45.2%Easy
Stack, String· 113 companies
21. Merge Two Sorted ListsVideo
Solution68.7%Easy
Linked List, Recursion· 36 companies
22. Generate ParenthesesVideo
Solution79.6%Medium
Backtracking, Dynamic Programming +1· 40 companies
23. Merge k Sorted ListsVideo
Solution60.3%Hard
Divide and Conquer, Heap (Priority Queue) +2· 50 companies
24. Swap Nodes in PairsVideo
Solution70.3%Medium
Linked List, Recursion· 13 companies
25. Reverse Nodes in k-GroupVideo
Solution67.4%Hard
Linked List, Recursion· 27 companies
26. Remove Duplicates from Sorted ArrayVideo
Solution63.7%Easy
Array, Two Pointers· 26 companies
27. Remove ElementVideo
Solution62.2%Easy
Array, Two Pointers· 10 companies
28. Find the Index of the First Occurrence in a StringVideo
Solution47.0%Easy
String, String Matching +1· 16 companies
29. Divide Two IntegersVideo
Solution20.1%Medium
Bit Manipulation, Math· 8 companies
30. Substring with Concatenation of All WordsVideo
Solution35.4%Hard
Hash Table, Sliding Window +1· 10 companies
31. Next PermutationVideo
Solution46.1%Medium
Array, Two Pointers· 31 companies
32. Longest Valid ParenthesesVideo
Solution41.2%Hard
Dynamic Programming, Stack +1· 25 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
35. Search Insert PositionVideo
Solution52.1%Easy
Array, Binary Search· 12 companies
36. Valid SudokuVideo
Solution64.9%Medium
Array, Hash Table +1· 26 companies
37. Sudoku SolverVideo
Solution65.4%Hard
Array, Backtracking +2· 17 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
41. First Missing PositiveVideo
Solution43.8%Hard
Array, Hash Table· 33 companies
42. Trapping Rain WaterVideo
Solution68.2%Hard
Array, Dynamic Programming +3· 73 companies
43. Multiply StringsVideo
Solution44.4%Medium
Math, Simulation +1· 17 companies
44. Wildcard MatchingVideo
Solution32.8%Hard
Dynamic Programming, Greedy +2· 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
Showing 1–50 of 4,005