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Cod sursa(job #230295)
#include<string.h>
#include<stdio.h>
int main()
{ int i,t,v[100]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4},ln,nr;
char n[102];
for(i=1;i<=4;i++)
for(t=0;t<=19;t++)
v[20*i+t]=(v[20*(i-1)+t]+4)%10;
freopen("cifra.in","rt" ,stdin);
freopen("cifra.out","wt" ,stdout);
scanf("%d\n",&t);
for(i=0;i<t;i++)
{
gets(n);
ln=strlen(n);
if(ln>1) nr=(n[ln-2]-48)*10+n[ln-1]-48;
else nr=n[ln-1]-48;
printf("%d\n", v[nr]);
}
return 0;
}