func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int x1, y1, x2, y2;     cin >> x1 >> y1 >> x2 >> y2;     int a = abs(x1 - x2);     int b = abs(y1 - y2);     int u = min(a, b);     cout << u + abs(a - b);     return 0;   }   