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Cod sursa(job #508486)
#include<fstream.h>
ifstream f("cifra.in");
ofstream g("cifra.out");
long long t, n, i, x, s, p, b, e, k;
int main()
{ f>>t;
for(i=1; i<=t; i++) { f>>n;
s=0;
for(x=1; x<=n; x++) { b=x%10;
e=(x-1)%4+1;
p=1;
for(k=1; k<=e; k++) p=p*b%10;
s=(s+p)%10;
}
g<<s<<"\n";
}
f.close();
g.close();
return 0;
}