1. 107. Binary Tree Level Order Traversal II

  2. 459. Repeated Substring Pattern

  3. 1122. Relative Sort Array

  4. 412. Fizz Buzz

  5. 202. Happy Number

  6. 415. Add Strings

  7. 7. Reverse Integer

  8. 206. Reverse Linked List

  9. 53. Maximum Subarray

  10. 581. Shortest Unsorted Continuous Subarray

  11. 852. Peak Index in a Mountain Array

  12. 350. Intersection of Two Arrays II

  13. 20. Valid Parentheses

  14. 38. Count and Say

  15. 937. Reorder Data in Log Files

  16. 443. String Compression

  17. 437. Path Sum III

  18. 54. Spiral Matrix

  19. 380. Insert Delete GetRandom O(1)

  20. 542. 01 Matrix

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