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Cod sursa(job #130462)
#include<fstream.h>
#include<math.h>
#include<string.h>
char x[102];
int a,t,b,n,k,l,i,j,s;
int main(){
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for(i=1;i<=t;i++)
{f>>x;
j=strlen (x);
a=b=0;
a=x[j-1]-48;
if(j>2)
b=x[j-2]-48;
k=b*10+a;
s=0;
for(j=1;j<=k;j++)
{l=j%4;
if(l==0)
l=4;
n=pow(j%10,l);
n%=10;
s+=n;
s%=10;
}
g<<s;
g<<'\n';
}
return 0;
}