UVA350-水題

#include<iostream>using namespace std;int main()
{int c = 0;int Z, L, I, M;while (cin >> Z >> I >> M >> L){c++;if(Z == L && L == I && I == M && M == 0){return 0;}int i = 1;int K, P;I = I % M;Z = Z % M;K = L;L = P = (Z * L + I) % M;while (K != L){L = (Z * L + I) % M;if(L == P)break;i++;}cout << "Case " << c << ": " << i << endl;}return 0;
}