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Path Sum — Root-to-Leaf DFS with Running Remainder
Determine if a root-to-leaf path exists with a given sum using DFS that subtracts each node value from the target.
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Determine if a root-to-leaf path exists with a given sum using DFS that subtracts each node value from the target.
Collect all root-to-leaf paths with a given sum using DFS backtracking, appending and removing the current node.