poj 1607 Deck

#include <iostream>#include <cstdlib>#include <cstdio>#include <cstring>using namespace std;int n;int main(){    puts("Cards  Overhang");    while (~scanf("%d", &n))    {        double ans = 0;        for (int i = 1; i <= n; i++) ans += 1.0 / (i * 2);        printf("%5d%10.3fn", n, ans);        }        return 0;}