WA40，我看了其他帖子，感觉没问题啊

#include<bits/stdc++.h>
#define unsigned long long int
using namespace std;
int a,b;
int gcd(int x,int y)
{
	if(y==0)return x;
	return gcd(y,x%y);
}
signed main()
{
   	cin>>a>>b;
   	int g=gcd(a,b),l=a*b/g;
   	cout<<g<<" "<<l<<endl;
	return 0;   
}