Subtree Summation

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Hinata needs your help in her homework. - You are given a tree with **N** vertices with **1** as root vertex. - You need to find the result of this equation. ![image](https://s3.amazonaws.com/hr-assets/0/1567300921-058e70c644-3.PNG) Here **f(x)** = sum of values of all the vertices in the subtree of **x** whose values are strictly less than value at vertex **x**. ###INPUT FORMAT: 1. In the fi

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solution.cppC++17

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