delete pics to save space

2.1388.cpp

@@ -0,0 +1,21 @@
+#include<cstdio>
+#include<cmath>
+int n,m;
+double res,pos;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	while(scanf("%d%d",&n,&m)==2)
+	{
+		res=0;
+		for(int i=1;i<n;i++)
+		{
+			pos=(double)i/n*(n+m);
+			res+=fabs(pos-floor(pos+0.5))/(n+m);
+		}
+		printf("%.4lf\n",res*10000);
+	}
+	return 0;
+}