Zoro and Division

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Zoro considers the world flat and as he is the worst when it comes to finding direction so it will be very difficult if he considers world round and will be lost as usual. So for simpler reference consider a flat $2-D$ plane consisting of only integral points. Now, there are $N$ triangular islands on the flat plane (no island intersect each other but may touch or share an edge with each other).

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solution.cppC++17

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