Sum of all nodes in a binary tree

Calculating the sum of all nodes in a binary tree involves adding up the values of all the nodes in the tree.

To calculate the sum of all nodes in a binary tree using DFS, we can use a pre-order traversal. In a pre-order traversal, we first visit the current node, then recursively visit the left subtree, and then recursively visit the right subtree. We can use a recursive function to implement a pre-order traversal and calculate the sum of all nodes in the tree.

Code Solution

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