Christmas Gifts of 9

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Santa wants to give some gifts to Chef. So Santa told Chef that choose a number(N) and drop that number in a shocks and Santa will give gifts according to that number. Santa decided that he will form a string by taking N number of 9's,and he will square that string and then he will sum up the digits of string. Now this new formed number will be the amount of candies that Santa will give to Chef.

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solution.cppC++17

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