1719. Number Of Ways To Reconstruct A Tree

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You are given an array pairs, where pairs[i] = [xi, yi], and: - There are no duplicates. - xi < yi Let ways be the number of rooted trees that satisfy the following conditions: - The tree consists of nodes whose values appeared in pairs. - A pair [xi, yi] exists in pairs if and only if xi is an ancestor of yi or yi is an ancestor of xi. - Note: the tree does not have to be a binary tree. Tw

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solution.cppC++17

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