func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, x, y;     cin >> n;     long long sumX = 0;     long long sumY = 0;     long long sum = 0;     for (int i = n; i > 0; i--) {       cin >> x;       cin >> y;       sumX += x;       sum += x * x;       sumY += y;       sum += y * y;     }     printf( %I64d , (n * sum) - (sumX * sumX) - (sumY * sumY));     printf(  n );     return 0;   }   