1. hashmap

  2. fib

  3. team game

  4. 2264. Largest 3-Same-Digit Number in String

  5. 26. Remove Duplicates from Sorted Array

  6. 1. Two Sum

  7. 15. 3Sum

  8. 813. Largest Sum of Averages

  9. 729. My Calendar I

  10. 75. Sort Colors

  11. 946. Validate Stack Sequences

  12. 692. Top K Frequent Words

  13. 2. Add Two Numbers

  14. 731. My Calendar II

  15. 3. Longest Substring Without Repeating Characters

  16. 347. Top K Frequent Elements

  17. 23. Merge k Sorted Lists

  18. 114. Flatten Binary Tree to Linked List

  19. 62. Unique Paths

  20. 994. Rotting Oranges

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