#include<stdio.h> #include<math.h> void main(){ int a,b,c; double s; while(scanf("%d %d %d",&a,&b,&c)!=EOF){ s=(a+b+c)/2.0; if((a+b>c)&&(fabs(a-b)<c)||(a+c>b)&&(fabs(a-c)<b)||(c+b>a)&&(fabs(c-b)<a)) printf("%lf\n",sqrt(s*(s-a)*(s-b)*(s-c))); }} |
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