func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     map<int, bool> hash;     int p, n;     bool has = false;     cin >> p >> n;     for (int i = 0; i < n; i++) {       int x;       cin >> x;       x %= p;       if (hash.count(x) && !has) {         cout << i + 1 << endl;         has = true;       } else {         hash[x] = true;       }     }     if (!has) printf( -1 );   }   