delete pics to save space

history_source/信息学奥赛一本通/1.2.3.5.cpp

@@ -0,0 +1,10 @@
+#include<cstdio>
+using namespace std;
+int main()
+{
+	double r1,r2;
+	scanf("%lf%lf",&r1,&r2);
+	double ans=1.0/(1.0/r1+1.0/r2);
+	printf("%.2lf\n",ans);
+	return 0;
+}