872. 最大公约数

https://www.acwing.com/problem/content/description/874/

#include<cstdio>
#include<iostream>
using namespace std;
int gcd(int a,int b)
{
	return b?gcd(b,a%b):a;
}
int main(void)
{
	int n; cin>>n;
	while(n--)
	{
		int a,b; cin>>a>>b;
		cout<<gcd(a,b)<<endl;
	}
	return 0;
}

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来源： https://blog.csdn.net/bettle_king/article/details/116863163