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Cod sursa(job #286526)
#include <iostream.h>
#include <fstream.h>
int main() {
long long n, i, j, s, put, t, k;
ifstream f; f.open("cifra.in");
ofstream g; g.open("cifra.out");
f>>t;
s=0;
for(k=1; k<=t; k++) {
f>>n;
s=0;
for(i=1; i<=n; i++) {
put=1;
for(j=1; j<=i; j++) {
put=(put%10) * i;
}
s=(s+put)%10;
}
g<<s<<endl;
}
f.close();
g.close();
return 0;
}