Soumya and Cycles

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Alas! The evil Trijeet has yet again trapped Soumya in a different dimension. This time, Soumya is trapped in a world of rooms connected by portals. There are $N$ rooms in this world, each containing multiple portals. Also, the portals are $\text{uni-directional}$. That is, a portal can only send you from a room to another room and not back again. Obviously, this is very confusing for Soumya and

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solution.cppC++17

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