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Cod sursa(job #776868)
#include<stdio.h>
#include<math.h>
#include<string.h>
char a[110];
int b[110];
int main()
{
freopen("cifra.in","r",stdin);
freopen("cifra.out","w",stdout);
int t,i,n,a1,a2,j,z,s,m;
scanf("%d",&t);
gets(a);//1+4+7+6+5+6+3+6+9=7
//1+6+3+6+5+6+7+4+9=7
for(i=1;i<=t;i++)
{
s=0;
gets(a);
n=strlen(a);
if(n>=2)
{
j=a[n-1]-48;
z=(a[n-2]-48)*10+a[n-1]-48;
m=z;
z=z%4;
if(z==0)
z=4;
do
{
s=s+pow(j,z);
s=s%10;
j--;
z--;
m--;
if(z==0)
z=4;
if(j==-1)
j=9;
}while(m!=0);
}
else
{
do
{
j=a[0]%4;
if(j==0)
j=4;
s=s+pow(a[0]-48,j);
s=s%10;
a[0]--;
}while(a[0]!=48);
}
printf("%d\n",s);
}
return 0;
}