func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t[105][105];     int n;     int x1, y1, x2, y2;     while (cin >> n) {       for (int i = 0; i < 105; i++) {         for (int j = 0; j < 105; j++) t[i][j] = 0;       }       for (int z = 0; z < n; z++) {         cin >> x1 >> y1 >> x2 >> y2;         for (int i = 101 - y1; i >= 101 - y2; i--) {           for (int j = 101 - x1; j >= 101 - x2; j--) t[i][j]++;         }       }       int ans = 0;       for (int i = 1; i <= 100; i++) {         for (int j = 1; j <= 100; j++) ans += t[i][j];       }       cout << ans <<   n ;     }   }   