首先是能通过给的示例样例，居然还是wrong answer

还有就是把网上所有方法找了，都是wrong answer

假设网站自己的测试数据有误吧，下面上我的思路和代码：

#include 
#include 
#include 
#include 

using namespace std;

vector str;

struct Res {
    string small;
    string big;
    int distance;
};

int cnt_distance(string a, string b)
{
    int cnt = 0;
    for (int i = 0; i < a.size(); i ++)
    {
        if (a[i] != b[i]) cnt ++;
    }
    
    return cnt;
}

bool compare(const Res& a, const Res& b) 
{
    if (a.distance == b.distance)
    {
        if (a.small == b.small)
            return a.big < b.big;
        return a.small < b.small;
    }
    
    return a.distance < b.distance;
}

int main()
{
    int N;
    cin >> N;
    
    vector results; //用来存最后要输出的六条数据
    
    string a;
    for (int i = 0; i < N; i ++) cin >> a, str.push_back(a);
    
    for (int i = 0; i + 1 < str.size(); i ++)
        for (int j = i + 1; j < str.size(); j ++)
    ...