CQXYM Count Permutations codeforces solution

CQXYM Count Permutations codeforces solution CQXYM is counting permutations length of 2n2n. A permutation is an array consisting of nn distinct integers from 11 to nn in arbitrary order. For example, [2,3,1,5,4][2,3,1,5,4] is a permutation, but [1,2,2][1,2,2] is not a permutation (22 appears twice in the array) and [1,3,4][1,3,4] is also not a permutation (n=3n=3 but there is 44 in the array). A permutation pp(length of 2n2n) will be counted only if the number …

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