Laziness of Killjee

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Saraff best friend of Killjee recently gave a problem to Killjee. Killjee being too lazy is asking you out to help him. You are given a number N and an array A of size M. You are supposed to find number of permutations of 1,2,3,......,N which has array A as its subsequence. Input First line of Input contains two space separated integers N. Next line contains M space separated integers, elements

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solution.cppC++17

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