They are COMING

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The **White Walkers** are coming. The Winterfell is the first place to be attacked by the Night King and his army of the dead. Jon Snow with Khaleesi has to take some important decisions to minimize the damage from the White Walkers. Winterfell can be denoted as a graph with $N$ nodes. There are $M$ roads each connecting 2 nodes - $A_i$ and $B_i$. The road is **directed from node

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solution.cppC++17

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