Clash of Universes

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In the game of Clash of Universes builders play a major role as they do all the construction you require. Also, they are very valuable. You started playing COU and you decided to purchase $N$ builders. But there is a problem, the contractor charges you according to the number of builders you purchase. The first builder costs you $K$ gems. If you purchase a second builder it costs you $2*K$ gems, a

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solution.cppC++17

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