#include <iostream>
#include <string>
#include <algorithm>

using namespace std;
string numbers[30];

int main(void)
{
	int n;
	cin>>n;
	for (int i=0;i<n;++i)
		cin>>numbers[i];
	sort(numbers,numbers+n,[](string a,string b)
	{
		return a+b>b+a;
	});
	for(int i=0;i<n;++i)
		cout<<numbers[i];
		
		return 0; 
}

在本地都能过，luogu编译就报错了，怎么回事啊