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Cod sursa(job #848895)
#include<fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
int n,i,us,up,j,t,l;
fin>>t;
for(l=1;l<=t;l++)
{
fin>>n;
us=0;
for(i=1;i<=n;i++)
{
up=1;
for(j=1;j<=i;j++)
up=up*i%10;
us=(us+up)%10;
}
fout<<us<<'\n';
}
fin.close();
fout.close();
return 0;
}