有必要吗：
#include<bits/stdc++.h>
using namespace std;
int main(){
    string a,b;
    cin>>a>>b;
    if(a==b) cout<<a;
    else if(a>b) cout<<b<<' '<<a;
    else cout<<a<<' '<<b;
}


```cpp
#include<bits/stdc++.h>
using namespace std;
char a[114514],b[114514],a1[114514],b1[114514];
int main(){
    int aa=1;
    cin>>a>>b;
    memcpy(a1,a,sizeof(a));
    memcpy(b1,b,sizeof(b));
    for(int i=0;i<max(strlen(a),strlen(b));i++){
        if(a1[i]>='A'&&a1[i]<='Z')a1[i]+=32;
        if(b1[i]>='A'&&b1[i]<='Z')b1[i]+=32;
        if(a1[i]>b1[i]){                          //同样可以用 
            cout<<b<<" "<<a;
            aa=1;
            break;
        }
        else if(a1[i]<b[i]){
        	cout<<a<<" "<<b;
        	aa=1;
        	break;
		}
        if(a1[i]==b1[i])aa=0;
    }
    if(aa==0)cout<<a;
    return 0;
}
```


题解

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