#include<stdio.h> #include<math.h> int main(){ int a,b,c; double p=0.0; double s=0.0; scanf("%d %d %d",&a,&b,&c); if(a+b>c&&a+c>b&&b+c>a){ p=(a+b+c)/2.0; s=sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2f",s); } else{ printf("\n"); return 0; } } |
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