Selected Trees Questions

1. https://leetcode.com/problems/count-good-nodes-in-binary-tree
2. https://leetcode.com/problems/serialize-and-deserialize-binary-tree
3. https://leetcode.com/problems/binary-tree-maximum-path-sum
4. https://leetcode.com/problems/binary-tree-right-side-view
5. https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree
6. https://leetcode.com/problems/validate-binary-search-tree
7. https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal
8. https://leetcode.com/problems/find-duplicate-subtrees
9. https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal
10. https://leetcode.com/problems/populating-next-right-pointers-in-each-node
11. https://leetcode.com/problems/construct-binary-tree-from-string
12. https://leetcode.com/problems/sum-root-to-leaf-numbers
13. https://leetcode.com/problems/flatten-binary-tree-to-linked-list
14. https://leetcode.com/problems/path-sum-ii
15. https://leetcode.com/problems/closest-leaf-in-a-binary-tree
16. https://leetcode.com/problems/binary-tree-pruning
17. https://leetcode.com/problems/path-sum-iii
18. https://leetcode.com/problems/most-frequent-subtree-sum
19. https://leetcode.com/problems/maximum-binary-tree
20. https://leetcode.com/problems/linked-list-in-binary-tree
21. https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree
22. https://leetcode.com/problems/binary-tree-cameras

Note : Go in order.