func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e5 + 10;   int main() {     ios::sync_with_stdio(false);     int n;     while (cin >> n) {       int a, b, c, d, sum = 0, i = 0, mx = -1, my = -1, mix = N, miy = N;       for (i = 0; i < n; i++) {         cin >> a >> b >> c >> d;         sum += abs(a - c) * abs(d - b);         mx = max(mx, max(a, c));         my = max(my, max(d, b));         mix = min(mix, min(a, c));         miy = min(miy, min(d, b));       }       if (((mx - mix) != (my - miy)) || (mx - mix) * (my - miy) != sum)         cout <<  NO  << endl;       else         cout <<  YES  << endl;     }     return 0;   }   