hdu 2940

简单的大数乘法，直接改16进制~~

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <algorithm>
#define maxn 3010
#define INF 0x7fffffff
#define ull unsigned long long
using namespace std;
int f[maxn], ans[110];
void init()
{
    memset(f, 0, sizeof(f));
    memset(ans, 0, sizeof(ans));
    f[0] = 1;
    for(int i = 2; i <= 100; ++ i)
    {
        int x = 0;
        for(int j = 0; j < maxn; j++)
        {
            int s = f[j] * i + x;
            f[j] = s%16;
            x = s/16;
        }
        int k;
        for(k = maxn-1; k >= 0; k--) if(f[k]) break;
        for(int j = 0; j <= k; j++) if(!f[j]) ans[i]++;
    }
}
int main()
{
    init();
    int n;
    while(scanf("%d", &n) == 1)
    {
        if(n < 0) break;
        printf("%d\n", ans[n]);
    }
    return 0;
}