1. 206. Reverse Linked List

  2. 1055. Shortest Way to Form String

  3. 437. Path Sum III

  4. 108. Convert Sorted Array to Binary Search Tree

  5. [todo] 687. Longest Univalue Path

  6. 459. Repeated Substring Pattern

  7. 690. Employee Importance

  8. 1108. Defanging an IP Address

  9. 257. Binary Tree Paths

  10. 111. Minimum Depth of Binary Tree

  11. 107. Binary Tree Level Order Traversal II

  12. 993. Cousins in Binary Tree

  13. 202. Happy Number

  14. 1122. Relative Sort Array

  15. 763. Partition Labels

  16. 412. Fizz Buzz

  17. 669. Trim a Binary Search Tree

  18. 110. Balanced Binary Tree

  19. 112. Path Sum

  20. 559. Maximum Depth of N-ary Tree

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