题解

#include<bits/stdc++.h>
using namespace std;
int main() {

  int t, n;
  cin >> t;
  while (t--) {
      cin >> n;
      string s[105], str = "";
      for (int i = 1; i <= n; i++) 
          cin >> s[i];
      sort(s + 1, s + 1 + n);
      for (int i = 1; i <= n; i++) 
          str += s[i];
      bool flag = true;
      for (int i = 1; i < str.size(); i++) {
          if (str[i] < str[i-1]) {
              flag = false;
              break;
          }
      }
      cout << flag << endl;
  }
  return 0;

}