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[code=C/C++][/code]
#include <string.h>
#define MAXN 10000
int lastdigit(char* buf)
{
const int mod[20]={1,1,2,6,4,2,2,4,2,8,4,4,8,4,6,8,8,6,8,2};
int len=strlen(buf),a[MAXN],i,c,ret=1;
if (len==1)
return mod[buf[0]-'0'];
for (i=0;i<len;i++)
a[i]=buf[len-1-i]-'0';  
* for (;len;len-=!a[len-1])
{
ret=ret*mod[a[1]%2*10+a[0]]%5;
for (c=0,i=len-1;i>=0;i--)
c=c*10+a[i],a[i]=c/5,c%=5;
}
* return ret+ret%2*5;
}
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