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Grokking the Coding Interview Patterns in Go

Solution: Path Sum

Explore how to solve the path sum problem in binary trees by applying depth-first search. Understand the approach of subtracting node values from the target sum and recursively checking all root to leaf paths to identify valid sums. Gain insight into the time and space complexity of this DFS-based 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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