1. 415. Add Strings

  2. 7. Reverse Integer

  3. 206. Reverse Linked List

  4. 53. Maximum Subarray

  5. 581. Shortest Unsorted Continuous Subarray

  6. 852. Peak Index in a Mountain Array

  7. 350. Intersection of Two Arrays II

  8. 20. Valid Parentheses

  9. 38. Count and Say

  10. 937. Reorder Data in Log Files

  11. 443. String Compression

  12. 437. Path Sum III

  13. 54. Spiral Matrix

  14. 380. Insert Delete GetRandom O(1)

  15. 542. 01 Matrix

  16. 139. Word Break

  17. 126. Word Ladder II

  18. 238. Product of Array Except Self

  19. 763. Partition Labels

  20. 121. Best Time to Buy and Sell Stock

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