func_code_string: #include <bits/stdc++.h>   using namespace std;   double R, r;   struct Punct {     double x, y;   };   Punct A, B;   inline double Dist(Punct A, Punct B) {     return sqrt((A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y));   }   int main() {     double d;     cin >> A.x >> A.y >> R;     cin >> B.x >> B.y >> r;     d = Dist(A, B);     if (R >= r) {       if (d + r <= R) {         d = R - d - r;         d /= 2.0;       } else {         if (d <= R + r)           d = 0.0;         else {           d = d - R - r;           d /= 2.0;         }       }     } else {       if (d + R <= r) {         d = r - d - R;         d /= 2.0;       } else {         if (d <= R + r)           d = 0.0;         else {           d = d - R - r;           d /= 2.0;         }       }     }     printf( %.6lf n , d);     return 0;   }   