hdu_1012(水题。。。不能再水)

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
long long mp[10];
double ans[10];
void init(){
    mp[0] = mp[1] = 1;
    for(int i = 2; i <= 9; i++){
        mp[i] = mp[i-1]*i;
    }
    ans[0] = 1.0;
    ans[1] = 2.0;
    ans[2] = 2.5;
    for(int i = 3; i <= 9; i++){
        ans[i] = ans[i-1]+1.0/mp[i];
    }
}
int main()
{
    init();
    printf("n e\n- -----------\n");
    printf("0 1\n1 2\n2 2.5\n");
    for(int i = 3; i <= 9; i++){
        printf("%d %.9lf\n",i,ans[i]);
    }
    return 0;
}