1,138 captures
11 Mar 2015 - 08 Oct 2025
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Array
994
String
490
Dynamic Programming
346
Hash Table
345
Math
332
Depth-First Search
233
Sorting
217
Greedy
214
Breadth-First Search
190
Database
188
Tree
183
Binary Search
165
Binary Tree
154
Matrix
152
Two Pointers
137
Bit Manipulation
121
Stack
115
Design
103
Heap (Priority Queue)
98
Backtracking
86
Graph
83
Simulation
77
Prefix Sum
70
Sliding Window
64
Counting
62
Linked List
61
Union Find
58
Recursion
42
Binary Search Tree
40
Trie
39
Monotonic Stack
38
Ordered Set
37
Divide and Conquer
37
Bitmask
31
Queue
31
Memoization
28
Geometry
26
Game Theory
24
Enumeration
24
Segment Tree
21
Hash Function
20
Topological Sort
20
Interactive
18
Binary Indexed Tree
16
String Matching
15
Data Stream
14
Rolling Hash
13
Shortest Path
12
Randomized
12
Combinatorics
12
Monotonic Queue
9
Iterator
9
Concurrency
9
Number Theory
8
Merge Sort
8
Brainteaser
8
Probability and Statistics
7
Doubly-Linked List
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
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Status
Title
Company
Solution
Acceptance
Difficulty
Frequency
1. Two Sum
47.9%
Easy
2. Add Two Numbers
37.3%
Medium
3. Longest Substring Without Repeating Characters
32.5%
Medium
4. Median of Two Sorted Arrays
33.1%
Hard
5. Longest Palindromic Substring
31.5%
Medium
6. Zigzag Conversion
40.3%
Medium
7. Reverse Integer
26.2%
Medium
8. String to Integer (atoi)
16.1%
Medium
9. Palindrome Number
51.8%
Easy
10. Regular Expression Matching
28.1%
Hard
11. Container With Most Water
53.2%
Medium
12. Integer to Roman
58.5%
Medium
13. Roman to Integer
57.7%
Easy
14. Longest Common Prefix
38.3%
Easy
15. 3Sum
30.0%
Medium
16. 3Sum Closest
46.9%
Medium
17. Letter Combinations of a Phone Number
52.2%
Medium
18. 4Sum
36.8%
Medium
19. Remove Nth Node From End of List
37.3%
Medium
20. Valid Parentheses
40.5%
Easy
21. Merge Two Sorted Lists
58.5%
Easy
22. Generate Parentheses
68.6%
Medium
23. Merge k Sorted Lists
45.3%
Hard
24. Swap Nodes in Pairs
56.2%
Medium
25. Reverse Nodes in k-Group
49.1%
Hard
26. Remove Duplicates from Sorted Array
47.8%
Easy
27. Remove Element
50.5%
Easy
28. Implement strStr()
35.7%
Easy
29. Divide Two Integers
17.0%
Medium
30. Substring with Concatenation of All Words
27.4%
Hard
31. Next Permutation
34.9%
Medium
32. Longest Valid Parentheses
30.8%
Hard
33. Search in Rotated Sorted Array
37.1%
Medium
34. Find First and Last Position of Element in Sorted Array
39.1%
Medium
35. Search Insert Position
42.7%
Easy
36. Valid Sudoku
53.7%
Medium
37. Sudoku Solver
51.8%
Hard
38. Count and Say
47.7%
Medium
39. Combination Sum
62.9%
Medium
40. Combination Sum II
51.7%
Medium
41. First Missing Positive
35.3%
Hard
42. Trapping Rain Water
54.7%
Hard
43. Multiply Strings
36.9%
Medium
44. Wildcard Matching
26.2%
Hard
45. Jump Game II
35.5%
Medium
46. Permutations
70.3%
Medium
47. Permutations II
52.5%
Medium
48. Rotate Image
64.4%
Medium
49. Group Anagrams
62.6%
Medium
50. Pow(x, n)
31.7%
Medium
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