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Cod sursa(job #383218)
#include<iostream.h>
#include<fstream.h>
long long putere (long n)
{long long c=1;
for(int i=1; i<=n; i++)
c*=n;
return c;}
int main()
{fstream f("cifra.in", ios::in);
fstream g("cifra.out", ios::out);
int T, v[20], nr=0, j,i; f>>T;
for(i=1; i<=T;i++)
{f>>v[i];
for(j=1; j<=v[i]; j++)
if(j%10==1)
nr=nr+1;
else if(j%10==5)
nr=nr+5;
else if(j%10==6)
nr=nr+6;
else nr=nr+putere(j);
g<<nr%10<<endl;nr=0;}
f.close();
return 0;
}