Guddu on a Date

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Guddu likes a girl that loves playing with numbers. She agreed to go on a date with Guddu, but only if he can solve the following problem: An integer is *round* if it is greater than $0$ and the sum of its digits in decimal representation is a multiple of $10$. Find the $N$-th smallest round integer. However, Guddu does not like playing with numbers at all and he is unable to solve this prob

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solution.cppC++17

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