先水一篇博客，哈哈哈。

//P1012 
#include <iostream> 
#include <string>
using namespace std; 

bool cmp(string, string); 
void sort(string*, int); 

int main() {
    int n; 
    cin >> n; 
    string* p = new string [n]; 
    for (int i = 0; i < n; ++i) 
        cin >> p[i];
    sort(p, n); 
    for (int i = 0; i < n; ++i) 
        cout << p[i]; 
    delete [] p; 
    return 0; 
}

bool cmp(string a, string b) { // 1: a > b 0: a < b
     int max = a.size() > b.size() ? a.size() : b.size(); 
     int a1, b1; 
    for (int i = 0; i < max; ++i) {
        if (a.size() <= i) 
            a1 = a[a.size()-1]; 
        else 
            a1 = a[i]; 
        if (b.size() <= i)
            b1 = b[b.size()-1]; 
        else 
            b1 = b[i];
        if (a1 != b1) 
            return a1 > b1; 
        else continue;           
    }
    return 1;
}

void sort(string* ps, int n) { 
    for (int i = 0; i < n-1; ++i) 
        for (int j = n-1; j > i; --j) 
            if (cmp(ps[j], ps[j-1])) { 
                string t = ps[j]; 
                ps[j] = ps[j-1]; 
                ps[j-1] = t; 
            }
}

https://www.luogu.org/problemnew/show/P1012