Conquering Demons

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It's Merisake's summer vacation and he was wondering what he could spend his time doing on his vacation. Like any other child, he decides to play his favorite game _Conquering Demons_. In this game, there are $N$ demons. Merisake plans to beat exactly one demon a day, i.e. he plans to play the game for $N$ days. Note that he can choose any unbeaten demon on any day. This game has a feature, wher

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solution.cppC++17

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