delete pics to save space

history_source/信息学奥赛一本通/1.2.6.10.cpp

@@ -0,0 +1,17 @@
+#include<cstdio>
+#include<cmath> 
+using namespace std;
+int main()
+{
+	double a,b,c;
+	scanf("%lf%lf%lf",&a,&b,&c);
+	if(!(a+b>c&&a+c>b&&b+c>a)) printf("no\n");
+	else
+	{
+		double p=(a+b+c)/2.0;
+		double ans=sqrt(p*(p-a)*(p-b)*(p-c));
+		printf("%lf\n",ans);
+	}
+	return 0;
+}
+