算法竞赛入门——阶乘的精确值

输入不超过1000的正整数n，输出n的阶乘的精确结果。
输入样例：30
输出样例：265252859812191058636308480000000

#include <iostream>

using namespace std;

int s[3000];

int main()
{
int n;
cin >> n;
memset(s, 0, sizeof(s));
s[0] = 1;
for (int i = 2; i <= n; i++)
{
int c = 0;
for (int j = 0; j < 3000; j++)
{
int a = s[j] * i + c;
s[j] = a % 10;
c = a / 10;
}
}
int m;
for (int i = 2999; i >= 0; i--)
{
if (s[i])
{
m = i;
break;
}
}
for (int i = m; i >= 0; i--)
cout << s[i];

system("pause");
return 0;
}