进阶 Day 1
#include <iostream>
#include <algorithm>
using namespace std;
int gcd(int a, int b)
{
return b ? gcd(b, a % b) : a;
} //gcd
int main(void)
{
int n;
scanf("%d", &n);
while (n--)
{
int a, b;
scanf("%d%d", &a, &b);
int res = gcd(a, b);
printf("%d\n", res);
}
return 0;
}