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Given the root of a binary tree and an integer targetSum, find the number of paths where the sum of the node values equals targetSum. A path can start from any node in the tree but must follow the parent-to-child direction (downward only). Design an efficient algorithm to solve this problem.
Given the root of a binary tree and an integer targetSum, find the number of paths where the sum of the node values equals targetSum. A path can start from any node in the tree but must follow the parent-to-child direction (downward only). Design an efficient algorithm to solve this problem.
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