1. 692. Top K Frequent Words

  2. 2. Add Two Numbers

  3. 731. My Calendar II

  4. 75. Sort Colors

  5. 347. Top K Frequent Elements

  6. 430. Flatten a Multilevel Doubly Linked List

  7. 23. Merge k Sorted Lists

  8. 729. My Calendar I

  9. 253. Meeting Rooms II

  10. 20. Valid Parentheses

  11. 62. Unique Paths

  12. 7. Reverse Integer

  13. 946. Validate Stack Sequences

  14. 973. K Closest Points to Origin

  15. 852. Peak Index in a Mountain Array

  16. 350. Intersection of Two Arrays II

  17. 443. String Compression

  18. 38. Count and Say

  19. 53. Maximum Subarray

  20. 3. Longest Substring Without Repeating Characters

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