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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6.  
  7. int main() {
  8.     double x,y,z;
  9.     double zero=0;
  10.     cin>>y>>x>>z;
  11.     if ((x==y)or(z==1)){
  12.         cout<<"IMPOSSIBLE";
  13.     }else if(z==0){
  14.         cout<<y;
  15.     }else {
  16.         cout<<fixed;
  17.         cout<<setprecision(9);
  18.         zero=(y*y-x*x*z*z)/double(1-z*z);
  19.         cout<<sqrt(zero);
  20.     }
  21.     return 0;
  22. }
Success #stdin #stdout 0s 15232KB
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Standard input is empty
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6.95333e-310
https://ideone.com/CGN68O
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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