View Code of Problem 24

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<algorithm>
#include<iostream>
using namespace std;
typedef long long ll;
int main(){
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	double m=(a+b+c)/2.0;
	double sum;
	sum=sqrt(m*(m-a)*(m-b)*(m-c));
	printf("%.2f\n",sum);
	return 0;
}