#include<stdio.h> #include<math.h> int main() { unsigned int a,b,c; float s,q; while(scanf("%d%d%d",&a,&b,&c)!=EOF) { q=(float)(a+b+c)/2; s=sqrt(q*(q-a)*(q-b)*(q-c)); printf("%.2f",s); } return 0; }
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