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Grokking the Coding Interview Patterns

Solution: Path Sum

Explore solving the path sum problem in a binary tree by using depth first search. Understand how to recursively traverse nodes, subtract node values from the target sum, and check for valid root-to-leaf paths. Gain insight into the solution's time and space complexity for efficient coding interview preparation.

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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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