1. 671. Second Minimum Node In a Binary Tree

  2. 20. Valid Parentheses

  3. 559. Maximum Depth of N-ary Tree

  4. 112. Path Sum

  5. 110. Balanced Binary Tree

  6. 669. Trim a Binary Search Tree

  7. 412. Fizz Buzz

  8. 763. Partition Labels

  9. 1122. Relative Sort Array

  10. 202. Happy Number

  11. 993. Cousins in Binary Tree

  12. 107. Binary Tree Level Order Traversal II

  13. 111. Minimum Depth of Binary Tree

  14. 257. Binary Tree Paths

  15. 1108. Defanging an IP Address

  16. 690. Employee Importance

  17. 459. Repeated Substring Pattern

  18. [todo] 687. Longest Univalue Path

  19. 108. Convert Sorted Array to Binary Search Tree

  20. 437. Path Sum III

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