Diagon Alley

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Harry, Ron and Hermione visits Diagon alley to buys things for their fifth year at Hogwarts. There are two types of price rates at Diagon alley- $a$ & $b$ Hermione currently have $0$ galleons with her. She can buy $k$ things in the following manner. For the first thing she need not pay any money and she would get $a$ galleons along with the item bought, for the second thing she need to spend $b$

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solution.cppC++17

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