题解:P11679 [Algo Beat Contest 001 A] Animal Beheaded
#include <bits/stdc++.h>
using namespace std;
int main() {
int N;
cin >> N;
string S;
cin >> S;
int m = N / 3;
string a = S.substr(0, m);
string b = S.substr(m, m);
string c = S.substr(2 * m, m);
cout << b + a + c << endl;
return 0;
}