April 2021 LeetCoding Challenge Day Question Links Solutions 1. Palindrome Linked List cpp 2. Ones and Zeroes cpp 3. Longest Valid Parentheses cpp 4. Design Circular Queue cpp 5. Global and Local Inversions cpp 6. Minimum Operations to Make Array Equal cpp 7. Determine if String Halves Are Alike cpp 8. Letter Combinations of a Phone Number cpp 9. Verifying an Alien Dictionary cpp 10. Longest Increasing Path in a Matrix cpp 11. Deepest Leaves Sum cpp 12. Beautiful Arrangement II cpp 13. Flatten Nested List Iterator cpp 14. Partition List cpp 15. Fibonacci Number cpp 16. Remove All Adjacent Duplicates in String II cpp 17. Number of Submatrices That Sum to Target cpp 18. Remove Nth Node From End of List cpp 19. Combination Sum IV cpp 20. N-ary Tree Preorder Traversal cpp 21. Triangle cpp 22. Brick Wall cpp 23. Count Binary Substrings cpp 25. Rotate Image cpp 26. Furthest Building You Can Reach cpp 27. Power of Three cpp 28. Unique Paths II cpp 29. Find First and Last Position of Element in Sorted Array cpp 30. Powerful Integers cpp