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Cod sursa(job #178227)
#include<fstream.h>
#include<iostream.h>
#include<math.h>
int main(void)
{
long int t,r,i,x[10],m,n;
fstream f,g;
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;
f.open("cifra.in",ios::in);
g.open("cifra.out",ios::out);
f>>t;
for(i=1;i<=t;i++)
{
f>>r;
m=x[r%10];
n=7*((r%100)/10);
m=(m+n)%10;
g<<m<<"\n";
}
f.close();
g.close();
return 0;
}