func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int x1, y1, x2, y2;     cin >> x1 >> y1 >> x2 >> y2;     int uppery = y2 + 1;     int lowery = y2 - 1;     int upperx = x2 + 1;     int lowerx = x2 - 1;     int ans = 4;     ans +=         abs(x1 - upperx) + abs(y1 - lowery) + abs(x1 - lowerx) + abs(y1 - uppery);     cout << ans << endl;     return 0;   }   