再次将解题代码封装在函数里。

#include <bits/stdc++.h>
#define io freopen("in.txt", "r", stdin), freopen("out.txt", "w", stdout)
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
string s1, s2;
void sizecmp(string a, string b){
    int sizeA = a.size();
    int sizeB = b.size();
    if(sizeA < sizeB){
        cout << a << endl << b << endl;
        exit(0);
    }
    if(sizeB < sizeA){
        cout << b << endl << a << endl;
        exit(0);
    }
}
void cmpAChar(char a, char b){
    if(a < b){
        cout << s1 << endl << s2 << endl;
        exit(0);
    }
    if(a > b){
        cout << s2 << endl << s1 << endl;
        exit(0);
    }
}
void cmp(){
    int len = s1.size();
    for(int i = 0; i < len; i++){
        cmpAChar(s1[i], s2[i]);
    }
}
void program(){
    cin >> s1 >> s2;
    sizecmp(s1, s2);
    cmp();
}
int main(){
    program();
    return 0;
}