1. 459. Repeated Substring Pattern

  2. 448. Find All Numbers Disappeared in an Array

  3. 443. String Compression

  4. 437. Path Sum III

  5. 430. Flatten a Multilevel Doubly Linked List

  6. 415. Add Strings

  7. 412. Fizz Buzz

  8. 380. Insert Delete GetRandom O(1)

  9. 38. Count and Say

  10. 350. Intersection of Two Arrays II

  11. 347. Top K Frequent Elements

  12. 3. Longest Substring Without Repeating Characters

  13. 287. Find the Duplicate Number

  14. 270. Closest Binary Search Tree Value

  15. 26. Remove Duplicates from Sorted Array

  16. 257. Binary Tree Paths

  17. 253. Meeting Rooms II

  18. 238. Product of Array Except Self

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

  20. 23. Merge k Sorted Lists

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