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Grokking the Coding Interview Patterns in JavaScript

Solution: Path Sum

Explore how to solve the path sum problem in binary trees by implementing a depth-first search algorithm. Understand how to recursively check root to leaf paths and apply logical operations to find if any path sums to a target value. This lesson helps you efficiently assess and code solutions for tree path sum challenges.

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Statement

Given the root of a binary tree and an integer targetSum, determine whether there exists a root to leaf path in the tree such that the sum of all node values along the path equals targetSum. Return TRUE if such a path exists, and FALSE otherwise.

Note: A leaf is defined as a node that has no left or right children.

Constraints:

  • The number of nodes in the tree is in the range [0,5000][0, 5000].

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