Crazy Hamster Wheel

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Danny pets a hamster named Cody. It is a well known fact that hamsters love running. But unfortunately the hamster wheel will only start spinning if he solves a number puzzle. Cody is given a number **$N$** where some of its digit are $‘x’$. In order to solve the puzzle he has to find all the digits $‘x’$ such that the number $N$ is the largest possible number divisible by 9. Help Cody to find

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solution.cppC++17

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