Paired War

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There are $2N$ countries ready to rage war against each other. But nobody likes war, neither does the UN. So it has planned a set of rules to minimize the total destruction: - The countries are divided into two disjoint groups having $N$ countries each. Countries $1$ to $N$ belong to group 1. The rest belong to group 2. - A country from group 1 can rage war against a country from group 2 only a

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solution.cppC++17

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