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  1. #include<iostream>
  2. #include<cmath>
  3. #include<iomanip>
  4. using namespace std;
  5. int main(){
  6. 	int t;
  7. 	cin>>t;
  8. 	cout<<fixed<<setprecision(2);
  9. 	while(t--){
  10. 		double a,b,c,d,s,ar;
  11. 		cin>>a>>b>>c>>d;
  12. 		s=(double)((double)(a+b+c+d)/(double)2);
  13. 		ar=(double)(s-a)*(s-b)*(s-c)*(s-d);
  14. 		cout<<(double)sqrt(ar)<<endl;
  15. 	}
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3464KB
comments (?)
stdin 
2
1 2 1 2
0.5 0.5 0.5 0.5
stdout 
2.00
0.25
https://ideone.com/kSPbfU
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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