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#include <fstream>
using namespace std;
ifstream is("euclid2.in");
ofstream os("euclid2.out");
long long int a, b
int t;
int ECD( int a, int b );
int main()
{
is >> t;
for ( int i = 1; i <= t; i++ )
{
is >> a >> b;
os << ECD( a, b ) << '\n';
}
is.close();
os.close();
return 0;
}
int ECD( long long int a, long long int b )
{
if ( b == 0 )
return a;
ECD( b, a%b );
}