Codeforces Round #545 (Div. 2) B. Circus(思维)
B. Circus time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Polycarp is a head of a circus troupe. There are n — an even number — artists in the troupe. It is known whether the i-th artist can perform as a clown (if yes, then ci=1, otherwise ci=0), and whether they can perform as an acrobat (if yes, then ai=1, otherwise ai=0). Split the artists into two performances in such a way that: each artist plays in exactly one performance, the number of artists in the two performances is equal (i.e. equal to n2), the number of artists that can