#include<stdio.h> #include<math.h> #include <string.h> #define Max 1000 #include <stdio.h> int main() { float a,b,c,s,d; scanf("%f %f %f",&a,&b,&c); if(a+b>c&&a+c>b&&b+c>a) { d=(a+b+c)/2; s=sqrt(d*(d-a)*(d-b)*(d-c)); printf("%.2f\n",s); } return 0; } |
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