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Cod sursa(job #886706)
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int v[]={0,1,5,2,8,3,9,2,8,7,0};
char s[102];
int k,t,i,j,cif,ul,lg;
int main()
{fin>>t;
for(i=1;i<=t;i++)
{fin.get();
fin.get(s,102);
lg=strlen(s);
k=s[lg-1]-'0';
if(lg==1) fout<<v[k]<<'\n';
else
{cif=s[lg-2]-'0';
cif=(cif*7)%10;
k=(v[k]+cif)%10;
fout<<k<<'\n';
}
}
fin.close();
fout.close();
return 0;
}