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Cod sursa(job #704870)
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
long long p,r,i,nr,x,y,j,m,N,s;
int main()
{f>>m;
for(j=1;j<=m;j++)
{f>>N;s=0; for(i=1;i<=N;i++){ if (i%4==0) s=((i%10)*(i%10)*(i%10)*(i%10))%10+s;
else if(i%4==1) s=i%10+s;
else if(i%4==2) s=((i%10)*(i%10))%10+s;
else s=((i%10)*(i%10)*(i%10))%10+s;}
g<<s%10<<'\n'; }
return 0;
}