极简题解|字符串的合并

#include<iostream>
using namespace std;
int main(){
    string a,b;
    cin>>a>>b;
    if(a>b){
        a+=b;
    }else{
        b+=a;
        a=b;
    }
    for(int i=1;i<a.size();i+=2){
        cout<<a[i];
    }
}