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  1. #include<iostream>
  2. #include<cmath>
  3. #include<iomanip>
  4. #include<cstdio>
  5. using namespace std;
  6. int main(){
  7. 	int t;
  8. 	double a,b,c,d,s,max_area;
  9. 	cin>>t;
  10. 	cout<<fixed<<setprecision(2);
  11. 	while(t--){
  12. 		scanf("%lf %lf %lf %lf",&a,&b,&c,&d);
  13.         s=(a+b+c+d)/2;
  14.         max_area=sqrt(((s-a)*(s-b)*(s-c)*(s-d)));
  15.         printf("%0.2lf\n",max_area);
  16. 	}
  17. 	return 0;
  18. }
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/uF0yiK
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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