Yet Another Coin Problem

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After cracking the Enigma, Alan got a bonus of $N$ coins. Now, Alan wants to spend all the coins in the nearby convenience store. He can perform the following operation any number of times (possibly zero): - Choose a positive integer $X, (1<= X <=N)$. Select items that cost exactly $X$ coins and buy them. After buying the items he gets a cashback of $\lfloor \frac{X}{K} \rfloor$ coins (

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solution.cppC++17

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