LYDSY 4001
题目大意
暂无
题目解法
暂无
RTFC
//http://blog.miskcoo.com/2015/04/bzoj-4001
#include <cstdio>
int main()
{
int n;
scanf("%d", &n);
printf("%.9lf", 1.0 * n * (n + 1) / 2 / (n * 2 - 1));
return 0;
}
暂无
暂无
//http://blog.miskcoo.com/2015/04/bzoj-4001
#include <cstdio>
int main()
{
int n;
scanf("%d", &n);
printf("%.9lf", 1.0 * n * (n + 1) / 2 / (n * 2 - 1));
return 0;
}