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Cod sursa(job #597061)
#include <fstream>
#include <string.h>
#include <math.h>
using namespace std;
int main()
{
ifstream f;
f.open("cifra.in");
ofstream g;
g.open("cifra.out");
int a[101];
int i;
a[0]=0;
int b;
for (i=1; i<100; i++)
{
b=pow(i,i%4+4);
b=b%10;
a[i]=(b+a[i-1])%10;
}
char s[101];
int n,nr;
f >> n;
for (i=0; i<n; i++)
{
f >> s;
int l=strlen(s);
if (l==1) g << a[s[0]-'0'] << "\n";
else
{
nr=(s[l-1]-'0')+10*(s[l-2]-'0');
g << a[nr] << "\n";
}
}
f.close();
g.close();
}