1. 126. Word Ladder II

  2. 139. Word Break

  3. 542. 01 Matrix

  4. 380. Insert Delete GetRandom O(1)

  5. 54. Spiral Matrix

  6. 437. Path Sum III

  7. 443. String Compression

  8. 937. Reorder Data in Log Files

  9. 38. Count and Say

  10. 20. Valid Parentheses

  11. 350. Intersection of Two Arrays II

  12. 852. Peak Index in a Mountain Array

  13. 581. Shortest Unsorted Continuous Subarray

  14. 53. Maximum Subarray

  15. 206. Reverse Linked List

  16. 7. Reverse Integer

  17. 415. Add Strings

  18. 202. Happy Number

  19. 412. Fizz Buzz

  20. 1122. Relative Sort Array

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