1. 459. Repeated Substring Pattern

  2. 107. Binary Tree Level Order Traversal II

  3. hashmap

  4. fib

  5. team game

  6. 690. Employee Importance

  7. 993. Cousins in Binary Tree

  8. 559. Maximum Depth of N-ary Tree

  9. 111. Minimum Depth of Binary Tree

  10. [todo] 687. Longest Univalue Path

  11. 1108. Defanging an IP Address

  12. 108. Convert Sorted Array to Binary Search Tree

  13. 112. Path Sum

  14. 257. Binary Tree Paths

  15. 110. Balanced Binary Tree

  16. 669. Trim a Binary Search Tree

  17. 671. Second Minimum Node In a Binary Tree

  18. 235. Lowest Common Ancestor of a Binary Search Tree

  19. 783. Minimum Distance Between BST Nodes

  20. 687. Longest Univalue Path

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