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Grokking the Coding Interview Patterns in C++

Solution: Path Sum

Explore how to determine if a binary tree has a root-to-leaf path where the sum of node values matches a targetSum. Learn to apply depth-first search recursively, check leaf nodes, and handle different tree structures efficiently.

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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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