101 Hack October'14

 1 #include <cmath>
 2 #include <cstdio>
 3 #include <vector>
 4 #include <iostream>
 5 #include <algorithm>
 6 using namespace std;
 7 
 8
 9 int main() {
10     ios::sync_with_stdio(false);
11     int t;
12     cin >> t;
13     while (t--) {
14         int n;
15         cin >> n;
16         string ch1, ch2;
17         cin >> ch1;
18         sort(ch1.begin(), ch1.end());
19         bool flag = true;
20         for (int i = 1; i < n; i++) {
21             cin >> ch2;
22             sort(ch2.begin(), ch2.end());
23             for (int j = 0; j < n; j++) if (ch1[j] > ch2[j]) flag = false;
24             //if (ch1 > ch2) flag = false;
25             swap(ch1, ch2);
26         }
27         if (flag) cout << "YES\n";
28         else cout << "NO\n";
29     }
30     
31     return 0;
32 }