#include <stdio.h> #include <math.h> #define p ((a+b+c)/2) main(){ double a,b,c,s; while(scanf("%lf %lf %lf",&a,&b,&c) != EOF){ s = sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2f\n",s); } return 0; }
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