How Well Trained is Your Dragon

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"Some of us were just born different." -Valka, How to Train Your Dragon 2 The Isle of Berk, where Vikings and Dragons coexist peacefully, is celebrating Valentine's Day and Astrid wants to give a pair of dragons to Hiccup, her fiancé. Astrid lines up $N$ dragons, numbered from $1$ to $N$ in a random order. To gift a pair of them to Hiccup, she must choose a pair of dragons from this order accor

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solution.cppC++17

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