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Cod sursa(job #521720)
#include<iostream.h>
#include<math.h>
#include<fstream.h>
#include<string.h>
ifstream f("cifra.in");
ofstream g("cifra.out");
long nr,i,s,c,k,t,x,j;
int main ()
{ f>>t;
for(i=1;i<=t;i++)
{ f>>x;
s=0;
for(j=1;j<=x;j++)
{
nr=j;
nr=nr%10;
if(nr==5||nr==6||nr==1||nr==0)
s=s+nr;
else
{
if(nr==4||nr==8||nr==2)
c=pow(nr,nr%4+4);
else
c=pow(nr,nr%4);
s=s+c;
}
s=s%10;
}
g<<s<<'\n';
}
return 0;
}