1,138 captures
11 Mar 2015 - 08 Oct 2025
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The Wayback Machine - https://web.archive.org/web/20210924180938/https://leetcode.com/problemset/algorithms/
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Array
948
String
470
Dynamic Programming
335
Hash Table
335
Math
322
Depth-First Search
231
Sorting
208
Greedy
203
Breadth-First Search
185
Tree
182
Database
180
Binary Search
154
Binary Tree
153
Matrix
145
Two Pointers
135
Bit Manipulation
119
Stack
113
Design
99
Heap (Priority Queue)
95
Backtracking
83
Graph
76
Simulation
68
Prefix Sum
63
Sliding Window
61
Linked List
58
Union Find
56
Counting
55
Recursion
42
Binary Search Tree
40
Trie
39
Monotonic Stack
37
Divide and Conquer
36
Ordered Set
33
Bitmask
30
Queue
29
Geometry
26
Memoization
26
Game Theory
22
Enumeration
20
Hash Function
20
Segment Tree
19
Topological Sort
19
Interactive
18
String Matching
15
Binary Indexed Tree
15
Data Stream
14
Rolling Hash
13
Randomized
12
Shortest Path
11
Combinatorics
10
Iterator
9
Concurrency
9
Monotonic Queue
8
Number Theory
8
Brainteaser
8
Probability and Statistics
7
Doubly-Linked List
7
Merge Sort
7
Quickselect
6
Bucket Sort
6
Minimum Spanning Tree
5
Counting Sort
5
Suffix Array
5
Shell
4
Line Sweep
4
Reservoir Sampling
4
Strongly Connected Component
2
Eulerian Circuit
2
Radix Sort
2
Rejection Sampling
2
Biconnected Component
1
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All Topics
Algorithms
Database
Shell
Concurrency
Difficulty
Status
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Status
Title
Company
Solution
Acceptance
Difficulty
Frequency
1. Two Sum
47.6%
Easy
2. Add Two Numbers
36.9%
Medium
3. Longest Substring Without Repeating Characters
32.2%
Medium
4. Median of Two Sorted Arrays
32.7%
Hard
5. Longest Palindromic Substring
31.2%
Medium
6. ZigZag Conversion
39.7%
Medium
7. Reverse Integer
26.1%
Easy
8. String to Integer (atoi)
16.0%
Medium
9. Palindrome Number
51.4%
Easy
10. Regular Expression Matching
27.9%
Hard
11. Container With Most Water
53.1%
Medium
12. Integer to Roman
58.2%
Medium
13. Roman to Integer
57.6%
Easy
14. Longest Common Prefix
37.8%
Easy
15. 3Sum
29.4%
Medium
16. 3Sum Closest
46.8%
Medium
17. Letter Combinations of a Phone Number
51.6%
Medium
18. 4Sum
36.6%
Medium
19. Remove Nth Node From End of List
36.9%
Medium
20. Valid Parentheses
40.4%
Easy
21. Merge Two Sorted Lists
57.9%
Easy
22. Generate Parentheses
68.0%
Medium
23. Merge k Sorted Lists
44.6%
Hard
24. Swap Nodes in Pairs
55.5%
Medium
25. Reverse Nodes in k-Group
48.3%
Hard
26. Remove Duplicates from Sorted Array
47.6%
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
27.1%
Hard
31. Next Permutation
34.6%
Medium
32. Longest Valid Parentheses
30.6%
Hard
33. Search in Rotated Sorted Array
36.8%
Medium
34. Find First and Last Position of Element in Sorted Array
38.7%
Medium
35. Search Insert Position
42.6%
Easy
36. Valid Sudoku
53.0%
Medium
37. Sudoku Solver
50.9%
Hard
38. Count and Say
47.4%
Medium
39. Combination Sum
62.0%
Medium
40. Combination Sum II
51.4%
Medium
41. First Missing Positive
35.0%
Hard
42. Trapping Rain Water
53.7%
Hard
43. Multiply Strings
36.0%
Medium
44. Wildcard Matching
26.0%
Hard
45. Jump Game II
34.5%
Medium
46. Permutations
69.4%
Medium
47. Permutations II
51.7%
Medium
48. Rotate Image
63.5%
Medium
49. Group Anagrams
61.9%
Medium
50. Pow(x, n)
31.5%
Medium
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