#include<stdio.h> #include<math.h> void main(){ double a,b,c,d,s; scanf("%lf %lf %lf",&a,&b,&c); if(a+b>c&&a+c>b&&b+c>a) { d=(a+b+c)/2; s=sqrt(d*(d-a)*(d-b)*(d-c)); printf("%lf",s); } }
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