## Heights and Pairs SOLUTION ACL CONTEST

Heights and Pairs SOLUTION Problem Statement There are 2N people numbered 1 through 2N. The height of Person i is hi.How many ways are there to make N pairs of people such that the following conditions are satisfied? Compute the answer modulo 998,244,353. Each person is contained in exactly one pair. For each pair, the heights of the two people in the pair are different. … Read more