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28 lines
515 B
C++
28 lines
515 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int t, n;
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bool flag;
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string s[10005];
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int main() {
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cin >> t;
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while (t--) {
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flag = false;
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cin >> n;
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for (int i = 0; i < n; i++) {
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cin >> s[i];
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}
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sort(s, s + n);
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for (int i = 0; i < n - 1; i++) {
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if (s[i + 1].substr(0, s[i].size()) == s[i]) {
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flag = true;
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break;
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}
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}
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cout << (flag ? "NO" : "YES") << endl;
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}
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return 0;
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}
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