1. 1055. Shortest Way to Form String

  2. 206. Reverse Linked List

  3. 139. Word Break

  4. 7. Reverse Integer

  5. 415. Add Strings

  6. 54. Spiral Matrix

  7. 542. 01 Matrix

  8. 53. Maximum Subarray

  9. 380. Insert Delete GetRandom O(1)

  10. 287. Find the Duplicate Number

  11. 581. Shortest Unsorted Continuous Subarray

  12. 121. Best Time to Buy and Sell Stock

  13. 852. Peak Index in a Mountain Array

  14. 238. Product of Array Except Self

  15. 350. Intersection of Two Arrays II

  16. 937. Reorder Data in Log Files

  17. 973. K Closest Points to Origin

  18. 126. Word Ladder II

  19. 430. Flatten a Multilevel Doubly Linked List

  20. 38. Count and Say

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