Decorate It

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Since it's almost Christmas, Dr.D wants to get in "That Christmas Feeling". As the first step, he's going to decorate his home. Since he's out of Christmas decorations, he must go buy some at the mall. There are exactly $K$ types of Christmas decorations and Dr.D wants to buy exactly one decoration of each type. The mall can be viewed as a sequence of $N$ shops (numbered $1$ through $N$) in a s

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solution.cppC++17

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