#include <stdio.h> #include <math.h> int main(){ int a,b,c; scanf("%d %d %d",&a,&b,&c); double s; double p; p = 1.0*(a+b+c)/2; if(a+b>c&&a+c>b&&b+c>a){ s = sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2lf",s); } return 0; } |
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