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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4. using namespace std;
  5.  
  6.  
  7. int main() {
  8. double x1, y1, z1, x, y, S;
  9. cin >> x >> y;
  10. cin >> x1 >> y1 >> z1;
  11. S = sqrt((x1-x)*(x1-x) + (y1-y)*(y1-y) + z1*z1);
  12. cout << fixed << setprecision(3) << 1/S;
  13. return 0;
  14. }
Success #stdin #stdout 0s 15240KB
stdin
60 21
11 44 -7
stdout
0.018