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