1. 459. Repeated Substring Pattern

  2. 107. Binary Tree Level Order Traversal II

  3. 690. Employee Importance

  4. 993. Cousins in Binary Tree

  5. 559. Maximum Depth of N-ary Tree

  6. 111. Minimum Depth of Binary Tree

  7. [todo] 687. Longest Univalue Path

  8. 1108. Defanging an IP Address

  9. 108. Convert Sorted Array to Binary Search Tree

  10. 112. Path Sum

  11. 257. Binary Tree Paths

  12. 110. Balanced Binary Tree

  13. 669. Trim a Binary Search Tree

  14. 671. Second Minimum Node In a Binary Tree

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

  16. 783. Minimum Distance Between BST Nodes

  17. 687. Longest Univalue Path

  18. 270. Closest Binary Search Tree Value

  19. 997. Find the Town Judge

  20. 203. Remove Linked List Elements

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