D - Tom and math phobia

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Just when Tom thought that he had mastered mathematics, he saw this question in his test and decided chasing Jerry was much better than solving maths questions.Now he needs your help this last time. You are given a number N, If you can make an array of size at most N and store elements from 1 to N, how many such non-empty arrays are possible (eg: N = 2, you can make arrays like [1], [2], [

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solution.cppC++17

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