```cpp
#include<stdio.h>
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
int cmp(string s1,string s2){return s1+s2>s2+s1;}
int main()
{
string a[21];
int n;
cin>>n;
for(int i=0;i<=n-1;i++)
cin>>a[i];
sort(a+0,a+n,cmp);
for(int i=0;i<=n-1;i++)
cout<<a[i];
return 0;
}
```
by qzqhb @ 2017-07-03 16:27:32