题解

#include<iostream>
using namespace std;
int main(){
    int a,b,c;
    cin>>a>>b;
    for(int i=a;i>0;i--){
        if(a%i==0&&b%i==0){
            cout<<"GCD="<<i<<endl;
            c=i;
            break;
        }
    }
    cout<<"LCM="<<a*b/c;
    return 0;
}

#include<iostream>
using namespace std;
int gcd(int a,int b){
    if(a%b==0){
        return b;
    }else{
        return gcd(b,a%b);
    }
}
int main(){
    int a,b;
    cin>>a>>b;
    cout<<"GCD="<<gcd(a,b)<<'\n';
    cout<<"LCM="<<a*b/gcd(a,b);
    return 0;
}