解答代碼

#include<iostream>#include<string>#include<cstring>#include<algorithm>using namespace std;#define N 4096int main(){	int result[N];	int n,i,j,temp=0;	memset(result,0,sizeof(result));	result[0]=1;	cin>>n;	for(i=1;i<=n;i++)	{		temp=0;		for(j=0;j<N;j++)		{			int s=result[j]*i+temp;			result[j]=s%10;			temp=s/10;		}	}	for(i=N-1;i>=0;i--)		if(result[i]!=0)			break;	for(;i>=0;i--)		cout<<result[i];	cout<<endl;	return 0;}