Topic: tree-problem / Level: advanced

• 2002. Implement a function to find the lowest common ancestor (LCA) of three nodes in a binary tree.
• 2003. Given a binary tree, flatten it to a linked list in-place.
• 2004. Calculate the maximum width of a binary tree at any level.
• 2005. Find the vertical order traversal of a binary tree.
• 2006. Check if a binary tree is a binary search tree and also return its height.
• 2007. Find the maximum sum of any subtree in a binary tree.
• 2008. Implement a function to recover a binary search tree from its inorder traversal.
• 2009. Check if two binary trees are structurally identical and have the same values.
• 2010. Implement a function to perform a post-order traversal of a binary tree without recursion.
• 2011. Find the longest path in a binary tree from any node to any node.
• 2012. Calculate the average value of each level in a binary tree.
• 2013. Find the minimum number of operations required to convert one binary tree into another.
• 2014. Implement a function to find the maximum product of split binary tree.
• 2015. Find the longest consecutive sequence path in a binary tree.
• 2016. Given a binary tree, return all possible full binary trees with N nodes.
• 2017. Find the number of unique binary search trees that can be formed with N distinct nodes.
• 2018. Check if a binary tree is a subtree of another binary tree.
• 2019. Implement a function to find the distance between two nodes in a binary tree.
• 2020. Find the sum of all left leaves in a binary tree.
• 2021. Find the diameter of a binary tree (the longest path between any two nodes).
• 2022. Implement a function to convert a binary search tree into a sorted doubly linked list.
• 2023. Count the number of unique BSTs that can be formed using the values from 1 to N.
• 2024. Check if a binary tree is height-balanced.
• 2025. Find the number of nodes that are at the same level in a binary tree.
• 2026. Implement a function to find the maximum depth of a binary search tree.
• 2027. Create a function to find the boundary of a binary tree.
• 2028. Find the smallest subtree that contains both given nodes in a binary tree.
• 2029. Implement a function to count the number of nodes in a complete binary tree.
• 2030. Find the total number of paths in a binary tree that sum to a specific value.
• 2031. Implement a function to validate a binary search tree using a helper function.
• 2032. Find the median of all the elements in a binary search tree.
• 2033. Calculate the sum of nodes at even levels in a binary tree.
• 2034. Find the sum of all nodes with an even-valued grandparent in a binary tree.
• 2035. Create a function to find the height of the left and right subtrees in a binary tree.
• 2036. Check if a binary tree is symmetric by comparing left and right subtrees.
• 2037. Implement a function to find all root-to-leaf paths in a binary tree.
• 2038. Find the maximum sum of non-adjacent nodes in a binary tree.
• 2039. Check if a binary tree is a complete binary tree based on properties.
• 2040. Count the number of leaf nodes in a binary tree.
• 2041. Implement a function to find the kth smallest element in a binary search tree using recursion.
• 2042. Find the longest palindromic path in a binary tree.
• 2043. Create a function to check if two binary trees are isomorphic.
• 2044. Find the deepest node in a binary tree.
• 2045. Calculate the sum of all right leaves in a binary tree.
• 2046. Find the longest common ancestor of three nodes in a binary tree.
• 2047. Implement a function to find all unique paths in a binary search tree.
• 2048. Check if a binary tree can be partitioned into two subtrees of equal sum.
• 2049. Find the longest path from root to leaf with a specified sum in a binary tree.
• 2050. Implement a function to convert a binary tree to its mirror image recursively.
• 2051. Find the maximum number of nodes on a path in a binary tree.

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