自己看吧

#include <bits/stdc++.h> using namespace std; int main(){ string s1,s2; cin>>s1>>s2; if(s1<s2) cout<<s1<<" "<<s2<<endl; else if(s1>s2) cout<<s2<<" "<<s1<<endl; else cout<<s1<<endl; return 0; }

#include <bits/stdc++.h> using namespace std; int main(){ string a,b; cin>>a>>b; if(a<b){ cout<<a<<" "<<b; }else if(a>b){ cout<<b<<" "<<a; }else if(a==b){ cout<<a; } return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ string a,b; cin>>a>>b; if(a>b){ cout<<b<<" "<<a; return 0; } if(a==b){ cout<<a; return 0; } cout<<a<<" "<<b; return 0; }