Present for Andrii

CodeChefRating 2729Open on judge ↗

Andrii is a great programmer. He recently managed to enter Ukrainian IOI team. His parents wanted to appreciate him and present him a DAG(Directed Acyclic Graph). His favourite TV show is "Pimp My Ride" so he'd like to customize his graph. He'd like to add as many edges as possible in order to still have a DAG. Please, help Andrii, find the maximum number of edges he can add to his graph without o

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solution.cppC++17

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