九度OJ 1179 阶乘（模拟）

#include<stdio.h>
unsigned long long n;
unsigned long long y1;
unsigned long long y2;
unsigned long long a[20];
void init(int n)
{
    a[0]=1;
    a[1]=1;
    for(unsigned long long  i=2;i<=n;++i)
    {
        a[i]=a[i-1]*i;
    }
}
unsigned long long gety1()
{
    unsigned long long y1=0;
    for(int i=1;i<=n;i+=2)
    {
        y1+=a[i];
    }
    return y1;
}
unsigned long long gety2()
{
    unsigned long long y2=0;
    for(int i=2;i<=n;i+=2)
        y2+=a[i];
    return y2;
}
int main(int argc, char *argv[])
{
   // freopen("1179.in", "r", stdin);
    while(~scanf("%llu",&n))
    {
        init(n);
        printf("%llu %llu\n",gety1(),gety2());
    }
    return 0;
}
 
/**************************************************************
    Problem: 1179
    User: kirchhoff
    Language: C
    Result: Accepted
    Time:0 ms
    Memory:912 kb
****************************************************************/