Solution: Path Sum

Explore how to use depth first search (DFS) to check if there exists a root to leaf path in a binary tree where the sum of node values equals a target sum. Understand the recursive approach to subtract node values from the target and identify valid paths. By the end of this lesson, you will be able to implement a solution that evaluates all root to leaf paths and returns true if any satisfy the sum condition, mastering binary tree traversal techniques for interview coding problems.