GCD, LCM은 언제든 쓰일 수 있음.
#include <string>
#include <vector>
using namespace std;
int gcd(int a, int b)
{
if(b == 0)
return a;
return gcd(b, a % b);
}
vector<int> solution(int n, int m) {
vector<int> answer;
answer.push_back(gcd(n, m));
answer.push_back(n * m / gcd(n, m));
return answer;
}