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Cod sursa(job #912851)
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int v[21]={0, 1, 5, 2, 8, 3, 9, 2, 8, 7, 7, 8, 4, 7, 3, 8, 4, 1, 5, 4, 4};
int t, l, u, z, nr, i;
char s[110];
int main(){
f>>t;
for(i=1; i<=t; i++)
{
f.get();
f.get(s, 110);
l=strlen(s);
u=s[l-1]-'0';
z=s[l-2]-'0';
if(strlen(s)==1 && u==0)
{
g<<"0\n";
continue;
}
if(z>=0)
nr=10*z+u;
else
nr=u;
z=nr/20;
u=nr%20;
if(z==0)
g<<v[nr]<<"\n";
else
g<<(z*v[20]+v[u])%10<<"\n";
}
return 0;
}