1. hashmap

  2. fib

  3. team game

  4. 692. Top K Frequent Words

  5. 2. Add Two Numbers

  6. 731. My Calendar II

  7. 75. Sort Colors

  8. 347. Top K Frequent Elements

  9. 20. Valid Parentheses

  10. 430. Flatten a Multilevel Doubly Linked List

  11. 23. Merge k Sorted Lists

  12. 729. My Calendar I

  13. 253. Meeting Rooms II

  14. 7. Reverse Integer

  15. 62. Unique Paths

  16. 350. Intersection of Two Arrays II

  17. 852. Peak Index in a Mountain Array

  18. 946. Validate Stack Sequences

  19. 973. K Closest Points to Origin

  20. 443. String Compression

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