func_code_string: #include <bits/stdc++.h>   using namespace std;   class point {    public:     int x, y;     point(int _x, int _y) {       x = _x;       y = _y;     }     string str() {       stringstream ss;       ss <<  (  << x <<  ,   << y <<  ) ;       return ss.str();     }   };   int main() {     int n;     cin >> n;     point min = point(31400, 31400), max = point(0, 0);     int used_area = 0;     for (int i = 0; i < n; i++) {       int x1, y1, x2, y2;       cin >> x1 >> y1 >> x2 >> y2;       point p1 = point(x1, y1), p2 = point(x2, y2);       if (x1 < min.x) min.x = x1;       if (y1 < min.y) min.y = y1;       if (x2 > max.x) max.x = x2;       if (y2 > max.y) max.y = y2;       used_area += (x2 - x1) * (y2 - y1);     }     int total_area = (max.x - min.x) * (max.y - min.y);     if (used_area == total_area && (max.x - min.x) == (max.y - min.y))       cout <<  YES  << endl;     else       cout <<  NO  << endl;     return 0;   }   