Problems - LeetCode

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Complete and win badges

Dynamic Programming337

Depth-First Search231

Breadth-First Search185

Binary Search157

Two Pointers136

Bit Manipulation120

Heap (Priority Queue)97

Sliding Window62

Binary Search Tree40

Monotonic Stack38

Divide and Conquer37

Hash Function20

Topological Sort19

Binary Indexed Tree16

String Matching15

Shortest Path11

Combinatorics10

Monotonic Queue8

Probability and Statistics7

Doubly-Linked List7

Minimum Spanning Tree5

Reservoir Sampling4

Strongly Connected Component2

Eulerian Circuit2

Rejection Sampling2

Biconnected Component1

Expand

Pick One

Status

Title

Company

Solution

Acceptance

Difficulty

Frequency

47.8%

Easy

2. Add Two Numbers

37.1%

Medium

3. Longest Substring Without Repeating Characters

32.3%

Medium

4. Median of Two Sorted Arrays

32.9%

Hard

5. Longest Palindromic Substring

31.3%

Medium

6. ZigZag Conversion

39.9%

Medium

7. Reverse Integer

26.2%

Medium

8. String to Integer (atoi)

16.0%

Medium

9. Palindrome Number

51.6%

Easy

10. Regular Expression Matching

28.0%

Hard

11. Container With Most Water

53.2%

Medium

12. Integer to Roman

58.3%

Medium

13. Roman to Integer

57.7%

Easy

14. Longest Common Prefix

38.0%

Easy

29.6%

Medium

16. 3Sum Closest

46.8%

Medium

17. Letter Combinations of a Phone Number

51.8%

Medium

36.7%

Medium

19. Remove Nth Node From End of List

37.1%

Medium

20. Valid Parentheses

40.5%

Easy

21. Merge Two Sorted Lists

58.2%

Easy

22. Generate Parentheses

68.2%

Medium

23. Merge k Sorted Lists

44.9%

Hard

24. Swap Nodes in Pairs

55.8%

Medium

25. Reverse Nodes in k-Group

48.6%

Hard

26. Remove Duplicates from Sorted Array

47.7%

Easy

27. Remove Element

50.3%

Easy

28. Implement strStr()

35.7%

Easy

29. Divide Two Integers

17.0%

Medium

30. Substring with Concatenation of All Words

27.3%

Hard

31. Next Permutation

34.7%

Medium

32. Longest Valid Parentheses

30.7%

Hard

33. Search in Rotated Sorted Array

36.9%

Medium

34. Find First and Last Position of Element in Sorted Array

38.9%

Medium

35. Search Insert Position

42.6%

Easy

36. Valid Sudoku

53.3%

Medium

37. Sudoku Solver

51.3%

Hard

38. Count and Say

47.5%

Medium

39. Combination Sum

62.4%

Medium

40. Combination Sum II

51.5%

Medium

41. First Missing Positive

35.1%

Hard

42. Trapping Rain Water

54.1%

Hard

43. Multiply Strings

36.1%

Medium

44. Wildcard Matching

26.1%

Hard

45. Jump Game II

34.9%

Medium

46. Permutations

69.7%

Medium

47. Permutations II

52.0%

Medium

48. Rotate Image

63.9%

Medium

49. Group Anagrams

62.2%

Medium

31.6%

Medium