Leetcode Problem 112. Path Sum
Leetcode Solutions
Recursive Approach to Find Root-to-Leaf Path Sum
- Check if the current node is null. If it is, return false since we cannot find a path in an empty tree.
- Subtract the node's value from the target sum.
- Check if the current node is a leaf (no children) and if the updated target sum is 0. If both conditions are met, return true.
- Recursively call the function for the left and right children of the current node, passing the updated target sum.
- Return true if either recursive call returns true, indicating a valid path was found in either subtree.
- If no valid path is found, return false.
Iterative Approach to Find Root-to-Leaf Path Sum
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