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Cod sursa(job #784771)
#include<string>
#include<fstream>
#include<cstring>
using namespace std;
int x[20],l,v,u,m,i,n;
char nr[102];
int main()
{
x[0]=0;x[1]=1;x[2]=5;x[3]=2;x[4]=8;
x[5]=3;x[6]=9;x[7]=2;x[8]=8;x[9]=7;
x[10]=7;x[11]=8;x[12]=4;x[13]=7;x[14]=3;
x[15]=8;x[16]=4;x[17]=1;x[18]=5;x[19]=4;
ifstream fi("cifra.in");
ofstream fo("cifra.out");
fi>>n;
for(i=1;i<=n;i++)
{fi>>nr;
l=strlen(nr);
if(l<=2) u=atoi(nr);
else u=atoi(&nr[l-2]);
v=u%20;m=u/20;m=4*m+x[v];m=m%10;
fo<<m<<endl;
}
return 0;
}