求助

#include<bits/stdc++.h>
using namespace std;
int lcm(long long a,long long b,long long gcd)
{
	return a*b/gcd;
}
int main(int argc,char**argv)
{
	long long a,b;
	cin>>a>>b;
	int gcd=__gcd(a,b);//系统函数，编译可过
	cout<<gcd<<" "<<lcm(a,b,gcd);
	return 0;
}