Buy Lamps

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An electronics shop sells red and blue lamps. A red lamp costs $X$ rupees and a blue lamp costs $Y$ rupees. Chef is going to buy **exactly** $N$ lamps from this shop. Find the **minimum** amount of money Chef needs to pay such that at least $K$ of the lamps bought are red. ### Input - The first line of input will contain a single integer $T$, denoting the number of test cases. - Each test case c

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solution.cppC++17

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