问题标题: 酷町堂：3795

#include<iostream>
#include<string>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<cstdlib>
#include<queue>
#include<iomanip>
using namespace std;
int gcd(int n,int m){
    if(m==0){
        return n;
    }
    return gcd(m,n%m);
}
int main(){
    int a1,a2,b1,b2;
    cin>>a1>>a2>>b1>>b2;
    cout<<a1*b1/gcd(a1*b1,a2*b2)<<'/'<<a2*b2/gcd(a1*b1,a2*b2);
    return 0;
}

黄子澄在2020-08-05 19:23:59追加了内容

#include<iostream>

#include<string>

#include<cstring>

#include<cstdio>

#include<algorithm>

#include<cmath>

#include<cstdlib>

#include<queue>

#include<iomanip>

using namespace std;

int gcd(int n,int m){

if(m==0){

return n;

}

return gcd(m,n%m);

}

int main(){

int a1,a2,b1,b2,c1,c2;

cin>>a1>>a2>>b1>>b2;

c1=a1*b1/gcd(a1*b1,a2*b2);

c2=a2*b2/gcd(a1*b1,a2*b2);

if(c2==1){

    cout<<c1;

    }

else{

    cout<<c1<<"/"<<c2;

    }

return 0;

}