Array
1. Two Sum OK
2. Best time to buy and sell stock OK
4. Product of array except self OK
5. Maximum subarray OK
6. Maximum product subarray OK
7. Find the minimum in rotated sorted array
8. Search in rotated sorted array
9. 3Sum
10. Container with most water
Matrix
11. Set matrix zeroes OK
12. Spiral matrix OK
13. Rotate image OK
14. Word Search OK
String
15. Longest Substring Without Repeating Character
16. Longest Repeating Character Replacement
17. Minimum Window Substring
18. Valid Anagram
19. Group Anagrams
20. Valid Parentheses
21. Longest Palindromic Substring
22. Palindromic Substrings
Linked List
24. Reverse Linked Lists OK
25. Linked List Cycle OK
26. Merge two sorted lists OK
27. Merge k Sorted Lists OK - vezi si #38
28. Remove Nth Node From End of List OK
29. Reorder List OK
Tree
30. Maximum Depth of Binary Tree OK
31. Same Tree OK
32. Invert Binary Tree OK
33. Binary Tree Maximum Path Sum OK
34. Binary Tree Level Order Traversal OK
35. Serialize & Deserialize Binary Tree OK
36. Design Add and Search Words Data Structure OK
37. Word Search II OK
Heap
38. Merge k Sorted Lists OK
39. Top K Frequent Elements OK
40. Find Median from Data Stream OK
Graph
41. Clone graph OK
42. Course Schedule OK
43. Number of Islands OK
44. Pacific Atlantic Water Flow OK
Dynamic Programming - link
45. Climbing Stairs OK
46. Coin Change OK
Bitwise Operations - link
47. Sum of Two Integers OK
48. Number of 1 Bit OK
49. Counting Bits OK
50. Missing Number OK
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