1057 N的阶乘（大数运算）

题目链接：51nod 1057 N的阶乘

 #include<cstdio>
 using namespace std;
 typedef long long ll;
 const int N = ;
 const int mod = 1e8;
 ll a[N] = {};
 int n;
 int main(){
     int i, j, c, cnt;
     scanf("%d", &n);
     cnt = ;
     for(j = ; j <= n; ++j){
         for(c = i = ; i <cnt; ++i){
             a[i] = a[i] * j + c;
             c = a[i] / mod;
             a[i] %= mod;
         }
         if(c > ){
             a[i] = c;
             cnt++;
         }
     }
     printf("%lld", a[--cnt]);
     while(cnt){
         printf("%08lld", a[--cnt]);
     }
     return ;
 }