Tree

• Maximum Depth of Binary Tree - https://leetcode.com/problems/maximum-depth-of-binary-tree/

• Same Tree - https://leetcode.com/problems/same-tree/

• Invert/Flip Binary Tree - https://leetcode.com/problems/invert-binary-tree/

• Binary Tree Paths - https://leetcode.com/problems/binary-tree-paths

• Binary Tree Maximum Path Sum - https://leetcode.com/problems/binary-tree-maximum-path-sum/

• Binary Tree Level Order Traversal - https://leetcode.com/problems/binary-tree-level-order-traversal/

• Serialize and Deserialize Binary Tree - https://leetcode.com/problems/serialize-and-deserialize-binary-tree/

• Sub-tree of Another Tree - https://leetcode.com/problems/subtree-of-another-tree/

• Construct Binary Tree from Preorder and Inorder Traversal - https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/

• Validate Binary Search Tree - https://leetcode.com/problems/validate-binary-search-tree/

• Kth Smallest Element in a BST - https://leetcode.com/problems/kth-smallest-element-in-a-bst/

• Lowest Common Ancestor of BST - https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/

• Implement Trie (Prefix Tree) - https://leetcode.com/problems/implement-trie-prefix-tree/

• Add and Search Word - https://leetcode.com/problems/add-and-search-word-data-structure-design/

• Word Search II - https://leetcode.com/problems/word-search-ii/