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Grokking the Coding Interview Patterns

Solution: Path Sum

Explore how to implement a depth-first search algorithm to find if there exists a root-to-leaf path in a binary tree where the sum of node values equals a given target. Understand handling edge cases and learn about time and space complexities in this recursive solution.

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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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