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Grokking the Coding Interview Patterns in Python

Solution: Path Sum

Explore how to use depth first search to find if any root to leaf path in a binary tree equals a given target sum. Understand the recursive approach, handle edge cases like empty trees, and analyze the time and space complexity of the solution. This lesson equips you to tackle tree-based path sum problems 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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