The Wayback Machine - https://web.archive.org/web/20220607040739/https://leetcode.com/problemset/algorithms/

　

　

SQL Study Plan
SQL Study Plan
Binary Search Study Plan
Binary Search Study Plan
14 Days Study Plan to Crack Algo
14 Days Study Plan to Crack Algo
2 Weeks Study Plan to Tackle DS
2 Weeks Study Plan to Tackle DS
Ultimate DP Study Plan
Ultimate DP Study Plan
Study plan
Study Plan
Complete and win badges
Array1120
String541
Hash Table387
Dynamic Programming370
Math361
Sorting249
Greedy245
Depth-First Search244
Database202
Breadth-First Search196
Tree189
Binary Search180
Matrix166
Binary Tree158
Two Pointers146
Bit Manipulation135
Stack126
Design112
Heap (Priority Queue)107
Graph98
Simulation92
Backtracking90
Prefix Sum89
Counting83
Sliding Window71
Linked List67
Union Find61
Ordered Set44
Recursion44
Monotonic Stack43
Trie41
Binary Search Tree40
Divide and Conquer38
Bitmask36
Enumeration35
Queue31
Geometry30
Memoization28
Segment Tree27
Topological Sort27
Game Theory24
Hash Function24
Binary Indexed Tree21
Interactive18
Rolling Hash17
Data Stream16
String Matching16
Shortest Path15
Number Theory13
Combinatorics13
Randomized12
Monotonic Queue9
Iterator9
Merge Sort9
Concurrency9
Brainteaser8
Probability and Statistics7
Doubly-Linked List7
Quickselect6
Bucket Sort6
Suffix Array6
Minimum Spanning Tree5
Counting Sort5
Shell4
Line Sweep4
Reservoir Sampling4
Eulerian Circuit3
Strongly Connected Component2
Radix Sort2
Rejection Sampling2
Biconnected Component1
Expand
All Topics
Algorithms
Database
Shell
Concurrency
Status
Title
Company
Solution
Acceptance
Difficulty
Frequency
1. Two Sum
48.7%
Easy
2. Add Two Numbers
38.8%
Medium
3. Longest Substring Without Repeating Characters
33.2%
Medium
4. Median of Two Sorted Arrays
34.3%
Hard
5. Longest Palindromic Substring
31.8%
Medium
6. Zigzag Conversion
41.8%
Medium
7. Reverse Integer
26.8%
Medium
8. String to Integer (atoi)
16.5%
Medium
9. Palindrome Number
52.5%
Easy
10. Regular Expression Matching
28.3%
Hard
11. Container With Most Water
54.0%
Medium
12. Integer to Roman
59.7%
Medium
13. Roman to Integer
57.9%
Easy
14. Longest Common Prefix
39.6%
Easy
15. 3Sum
31.3%
Medium
16. 3Sum Closest
47.1%
Medium
17. Letter Combinations of a Phone Number
54.4%
Medium
18. 4Sum
37.4%
Medium
19. Remove Nth Node From End of List
38.5%
Medium
20. Valid Parentheses
40.9%
Easy
21. Merge Two Sorted Lists
60.6%
Easy
22. Generate Parentheses
70.4%
Medium
23. Merge k Sorted Lists
47.3%
Hard
24. Swap Nodes in Pairs
59.0%
Medium
25. Reverse Nodes in k-Group
51.5%
Hard
26. Remove Duplicates from Sorted Array
49.2%
Easy
27. Remove Element
51.4%
Easy
28. Implement strStr()
36.2%
Easy
29. Divide Two Integers
17.5%
Medium
30. Substring with Concatenation of All Words
28.3%
Hard
31. Next Permutation
36.5%
Medium
32. Longest Valid Parentheses
32.3%
Hard
33. Search in Rotated Sorted Array
37.9%
Medium
34. Find First and Last Position of Element in Sorted Array
40.2%
Medium
35. Search Insert Position
42.3%
Easy
36. Valid Sudoku
55.4%
Medium
37. Sudoku Solver
54.5%
Hard
38. Count and Say
48.9%
Medium
39. Combination Sum
65.9%
Medium
40. Combination Sum II
52.5%
Medium
41. First Missing Positive
36.1%
Hard
42. Trapping Rain Water
56.9%
Hard
43. Multiply Strings
37.9%
Medium
44. Wildcard Matching
26.6%
Hard
45. Jump Game II
37.4%
Medium
46. Permutations
72.8%
Medium
47. Permutations II
55.6%
Medium
48. Rotate Image
67.1%
Medium
49. Group Anagrams
64.5%
Medium
50. Pow(x, n)
32.5%
Medium
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