Solved

1. 26. Remove Duplicates from Sorted Array
2. 155. Min Stack
3. 355. Design Twitter
4. 190. Rotate Array
5. 217. Contains Duplicate
6. 136. Single Number
7. 350. Intersection of Two Arrays II
8. 66. Plus One
9. 283. Move Zeroes
10. 1. Two Sum
11. 36. Valid Sudoku
12. 48.Rotate Image
13. 7. Reverse Integer
14. 344. Reverse String
15. 387. First Unique Character in a String
16. 242. Valid Anagram
17. 125. Valid Palindrome
18. 14. Longest Common Prefix
19. 8. String to Integer (atoi)
20. 28. Find the Index of the First Occurrence in a String
21. 237. Delete Node in a Linked List
22. 19. Remove Nth Node From End of List
23. 206. Reverse Linked List
24. 234. Palindrome Linked List
25. 21. Merge Two Sorted Lists
26. 141. Linked List Cycle
27. 104. Maximum Depth of Binary Tree
28. 101. Symmetric Tree
29. 98. Validate Binary Search Tree
30. 102. Binary Tree Level Order Traversal
31. 108. Convert Sorted Array to Binary Search Tree
32. 88. Merge Sorted Array
33. 278. First Bad Version
34. 70. Climbing Stairs
35. 121. Best Time to Buy and Sell Stock
36. 53. Maximum Subarray
37. 412. Fizz Buzz
38. 204. Count Primes
39. 326. Power of Three
40. 13. Roman to Integer
41. 122. Best Time to Buy and Sell Stock II
42. 286. Missing Number
43. 118. Pascal's Triangle
44. 191. Number of 1 Bits
45. 20. Valid Parentheses
46. 461. Hamming Distance
47. 190. Reverse Bits
48. 198. House Robber
49. 384. Shuffle an Array
50. 94. Binary Tree Inorder Traversal
51. 73. Set Matrix Zeroes
52. 49. Group Anagrams