1. 2264. Largest 3-Same-Digit Number in String

  2. 225. Implement Stack using Queues

  3. 222. Count Complete Tree Nodes

  4. 206. Reverse Linked List

  5. 203. Remove Linked List Elements

  6. 202. Happy Number

  7. 20. Valid Parentheses

  8. 2. Add Two Numbers

  9. 15. 3Sum

  10. 139. Word Break

  11. 126. Word Ladder II

  12. 121. Best Time to Buy and Sell Stock

  13. 114. Flatten Binary Tree to Linked List

  14. 1122. Relative Sort Array

  15. 112. Path Sum

  16. 111. Minimum Depth of Binary Tree

  17. 1108. Defanging an IP Address

  18. 110. Balanced Binary Tree

  19. 108. Convert Sorted Array to Binary Search Tree

  20. 107. Binary Tree Level Order Traversal II

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