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#include <fstream>
using namespace std;
int euclid(int a,int b)
{
if(a==0 && b!=0)
{
return b;
}
else
if(b==0 && a!=0)
{
return a;
}
else
{
int rest;
if(a<b)
{
swap(a,b);
}
while(a%b)
{
rest=a%b;
a=b;
b=rest;
}
return b;
}
}
int main()
{
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int t;
int a,b;
f>>t;
for(int i=1;i<=t;i++)
{
f>>a>>b;
g<<euclid(a,b)<<'\n';
}
return 0;
}