View Code of Problem 24

#include<stdio.h>
#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>
#include<stack>
#include<map>
#include<vector>
#include<cstdbool>
using namespace std;


int main()
{
	double a, b, c;
	cin >> a >> b >> c;
	double p = (a + b + c) / 2;
	double sum = sqrt(p * (p - a) * (p - b) * (p - c));
	printf("%.2lf\n", sum);


	return 0;
}