hdu 1042 N!(大数阶乘)
发布时间:2020-12-14 03:32:51 所属栏目:大数据 来源:网络整理
导读:链接:hdu 1042 Problem Description Given an integer N(0 ≤ N ≤ 10000),your task is to calculate N! ? Input One N in one line,process to the end of file. ? Output For each N,output N! in one line. ? Sample Input 123 ? Sample Output 126 ?
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链接:hdu 1042
Problem Description
Given an integer N(0 ≤ N ≤ 10000),your task is to calculate N!
?
Input
One N in one line,process to the end of file.
?
Output
For each N,output N! in one line.
?
Sample Input
?
Sample Output
?
模拟算数乘法,将每一位与乘数相乘,记录进位。
AC代码:
#include<stdio.h>
#include<string.h>
int s[10010];
int main()
{
int i,j,n,m,c;
while(scanf("%d",&n)!=EOF){
memset(s,sizeof(s));
s[0]=1;
c=0;
for(i=2;i<=n;i++)
for(j=0;j<=10000;j++){
m=s[j]*i+c;
s[j]=m%10000; //如果用char 处理,m只需对10取余或除以10
c=m/10000;
}
for(i=10000;i>=0;i--) //处理前导0
if(s[i]!=0)
break;
printf("%d",s[i]); //不能有前导0
for(i--;i>=0;i--)
printf("%04d",s[i]); //中间的0不能省略
printf("n");
}
return 0;
}
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