func_code_string: #include <bits/stdc++.h>   using namespace std;   const int NMAX = 31400;   struct point {     int x, y;   };   int n;   pair<point, point> p[5];   bool used[5];   bool func() {     long long s = 0;     point MIN, MAX;     MIN.x = MIN.y = NMAX;     MAX.x = MAX.y = 0;     for (int i = 0; i < n; i++) {       s += (p[i].second.x - p[i].first.x) * (p[i].second.y - p[i].first.y);       MIN.x = min(MIN.x, p[i].first.x);       MIN.y = min(MIN.y, p[i].first.y);       MAX.x = max(MAX.x, p[i].second.x);       MAX.y = max(MAX.y, p[i].second.y);     }     if ((MAX.x - MIN.x) == (MAX.y - MIN.y) && s == pow(MAX.x - MIN.x, 2)) {       return true;     }     return false;   }   int main() {     cin >> n;     pair<int, int> a, b, MAX, MIN;     for (int i = 0; i < n; i++) {       cin >> p[i].first.x >> p[i].first.y >> p[i].second.x >> p[i].second.y;     }     if (func())       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   