Trees

1 Invert Binary Tree Easy 2 Maximum Depth of Binary Tree Easy 3 Diameter of Binary Tree Easy 4 Balanced Binary Tree Easy 5 Same Tree Easy 6 Subtree of Another Tree Easy 7 Lowest Common Ancestor of a Binary Search Tree Medium 8 Binary Tree Level Order Traversal Medium 9 Binary Tree Right Side View Medium 10 Count Good Nodes in Binary Tree Medium 11 Validate Binary Search Tree Medium 12 Kth Smallest Element in a BST Medium 13 Construct Binary Tree from Preorder and Inorder Traversal Medium 14 Binary Tree Maximum Path Sum Hard 15 Serialize and Deserialize Binary Tree Hard