#include <iostream> #include<stdio.h> #include<math.h> using namespace std; int main() { double a, b, c; while (scanf("%lf %lf %lf", &a, &b, &c) != EOF) { double p = (a + b + c) / 2.0; printf("%.2f\n", sqrt(p*(p - a)*(p - b)*(p - c))); } return 0; } |
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