1. 20. Valid Parentheses

  2. 671. Second Minimum Node In a Binary Tree

  3. 203. Remove Linked List Elements

  4. 628. Maximum Product of Three Numbers

  5. 270. Closest Binary Search Tree Value

  6. 876. Middle of the Linked List

  7. 872. Leaf-Similar Trees

  8. 897. Increasing Order Search Tree

  9. 605. Can Place Flowers

  10. 56. Merge Intervals

  11. 448. Find All Numbers Disappeared in an Array

  12. 724. Find Pivot Index

  13. 687. Longest Univalue Path

  14. 997. Find the Town Judge

  15. 222. Count Complete Tree Nodes

  16. 783. Minimum Distance Between BST Nodes

  17. 532. K-diff Pairs in an Array

  18. 225. Implement Stack using Queues

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

  20. 697. Degree of an Array

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