December 2020 LeetCoding Challenge Day Question Links Solutions 1. Maximum Depth of Binary Tree cpp 2. Linked List Random Node cpp 3. Increasing Order Search Tree cpp 4. The kth Factor of n cpp 5. Can Place Flowers cpp 6. Populating Next Right Pointers in Each Node II cpp 7. Spiral Matrix II cpp 8. Pairs of Songs With Total Durations Divisible by 60 cpp 9. Binary Search Tree Iterator cpp 10. Valid Mountain Array cpp 11. Remove Duplicates from Sorted Array II cpp 12. Smallest Subtree with all the Deepest Nodes cpp 13. Burst Balloons cpp 14. Palindrome Partitioning cpp 15. Squares of a Sorted Array cpp 16. Validate Binary Search Tree cpp 17. 4Sum II cpp 18. Increasing Triplet Subsequence cpp 19. Cherry Pickup II cpp 20. Decoded String at Index cpp 21. Smallest Range II cpp 22. Balanced Binary Tree cpp 23. Next Greater Element III cpp 24. Swap Nodes in Pairs cpp 25. Diagonal Traverse cpp 26. Decode Ways cpp 27. Jump Game IV cpp 28. Reach a Number cpp 29. Pseudo-Palindromic Paths in a Binary Tree cpp 30. Game of Life cpp 31. Largest Rectangle in Histogram cpp