func_code_string: #include <bits/stdc++.h>   const int INF = 1000000;   using namespace std;   int main() {     int a, b, m;     vector<int> r(1);     scanf( %d %d %d %d , &a, &b, &m, &r[0]);     for (int i = 1; i < 2 * m + 2; i++) {       r.push_back((a * r[i - 1] + b) % m);     }     vector<int> ans(2 * m + 2, INF);     int res = 1;     for (int i = 1; i < m + 1; i++) {       for (int t = 1; t < m + 1; t++)         if (r[i] == r[i + t]) {           ans[i] = min(t, ans[i - 1]);           res = ans[i];           cout << res;           return 0;         }     }     cout << res;     return 0;   }   