1. 1055. Shortest Way to Form String

  2. 430. Flatten a Multilevel Doubly Linked List

  3. 114. Flatten Binary Tree to Linked List

  4. 946. Validate Stack Sequences

  5. 62. Unique Paths

  6. 3. Longest Substring Without Repeating Characters

  7. 994. Rotting Oranges

  8. 347. Top K Frequent Elements

  9. 23. Merge k Sorted Lists

  10. 2. Add Two Numbers

  11. 75. Sort Colors

  12. 973. K Closest Points to Origin

  13. 692. Top K Frequent Words

  14. 729. My Calendar I

  15. 731. My Calendar II

  16. 253. Meeting Rooms II

  17. 287. Find the Duplicate Number

  18. 121. Best Time to Buy and Sell Stock

  19. 763. Partition Labels

  20. 238. Product of Array Except Self

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