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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- int t;
- cin >> t;
- for(int i=0; i<t; i++)
- {
- int n;
- cin >> n;
- vector <string> v(n);
- for(int j=0; j<n; j++)
- cin >> v[j];
- sort(v.begin(), v.end());
- bool res = true;
- for(int j=1; j<n; j++)
- {
- if(v[j-1].size() < v[j].size())
- {
- int k = v[j-1].size();
- if(v[j-1] == v[j].substr(0, k))
- {
- res = false;
- break;
- }
- }
- }
- if(res)
- {
- cout << "YES" << endl;
- }
- else
- {
- cout << "NO" << endl;
- }
- }
- return 0;
- }
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