More Problems

• Find the sum of all left leaves in a binary tree.
• Find the diameter of a binary tree (the longest path between any two nodes).
• Implement a function to convert a binary search tree into a sorted doubly linked list.
• Count the number of unique BSTs that can be formed using the values from 1 to N.
• Check if a binary tree is height-balanced.
• Find the number of nodes that are at the same level in a binary tree.
• Implement a function to find the maximum depth of a binary search tree.
• Create a function to find the boundary of a binary tree.