Weismann and Products

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Weismann is a very curious person, and loves to play with numbers. One day, while playing with very very long numbers, a question suddenly popped up in his head. He wants to know the length of the product of the digits of the numbers he has. This means, if he has the number 542, the product 5 × 4 × 2 = 40 has 2 digits (4 and 0). He was able to do this for small numbers, but needs your help to ca

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solution.cppC++17

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