func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int x1, x2, y1, y2, xmin, xmax, ymin, ymax;     cin >> x1 >> y1 >> x2 >> y2;     xmin = x1;     xmax = x2;     ymin = y1;     ymax = y2;     int total = (x2 - x1) * (y2 - y1);     for (int a = 1; a < n; ++a) {       cin >> x1 >> y1 >> x2 >> y2;       xmin = min(x1, xmin);       xmax = max(x2, xmax);       ymin = min(y1, ymin);       ymax = max(y2, ymax);       total += (x2 - x1) * (y2 - y1);     }     if (ymax - ymin == xmax - xmin and (xmax - xmin) * (xmax - xmin) == total)       cout <<  YES  << endl;     else       cout <<  NO  << endl;     cin >> n;   }   