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Cod sursa(job #257143)
#include<fstream.h>
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
long int v[11],n,t,s;
v[0]=0;v[1]=1;v[2]=4;v[3]=7;v[4]=6;v[5]=5;v[6]=6;v[7]=3;v[8]=6;v[9]=9;
fin>>t;
// scanf("%d",&t);
for(long int i=1;i<=t;i++)
{
s=0;
fin>>n;
// scanf("%d",&n);
for(long int j=1;j<=n;j++)
s=s+v[j%10];
fout<<s%10<<"\n";
//printf("%d\n",s%10);
}
return 0;
}