Chef and Edge Flipping

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Chef likes tournament graphs, which are directed graphs where each unordered pair of vertices is directly connected by exactly one edge. A directed graph is *strongly connected* if for each pair of vertices $(a, b)$, there is a path from the vertex $a$ to the vertex $b$. Consider a tournament graph $G$ with $N$ vertices (numbered $1$ through $N$). Chef takes a sequence of pairs of vertices $(a_

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solution.cppC++17

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