Messi and his Permutation

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Messi is a brilliant student. Once his teacher Koeman provided him with a permutation of length $N$ to take care of. Mistakenly Messi shuffled it. He knows when Koeman gets to know about this he will become upset. There is one special property about permutation that the sum of all the prefix minimums is exactly $Y$ i.e., let $A[i] = min(Arr[1], Arr[2], ..., Arr[i])$, then $\sum_{i=1}^{N} A[i]$ = $

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solution.cppC++17

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