1. 412. Fizz Buzz

  2. 202. Happy Number

  3. 415. Add Strings

  4. 7. Reverse Integer

  5. 206. Reverse Linked List

  6. 53. Maximum Subarray

  7. 581. Shortest Unsorted Continuous Subarray

  8. 852. Peak Index in a Mountain Array

  9. 350. Intersection of Two Arrays II

  10. 20. Valid Parentheses

  11. 38. Count and Say

  12. 937. Reorder Data in Log Files

  13. 443. String Compression

  14. 437. Path Sum III

  15. 54. Spiral Matrix

  16. 380. Insert Delete GetRandom O(1)

  17. 542. 01 Matrix

  18. 139. Word Break

  19. 126. Word Ladder II

  20. 238. Product of Array Except Self

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