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Cod sursa(job #909983)
#include <iostream>
#include <fstream>
using namespace std;
long T, i,j,k,a,s,m,n,v[9];
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>T;
for(i=1;i<=T;i++)
{f>>n;s=0;
for(j=1;j<=n;j++)
{
a=1;
if(j%4==0){for(m=1;m<=j;m++)
{
a=a*j;a=a%10;
}
}
else{ for(m=1;m<=j%4;m++)
{
a=a*j;a=a%10;
}
} s=s+a;s=s%10;} g<<s<<endl;
}
return 0;
}