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- #include <bits/stdc++.h>
- using namespace std;
- typedef long long ll;
- signed main() {
- cin.tie(0)->sync_with_stdio(0);
- int n; cin >> n;
- vector<string> a(n);
- for (auto &i : a) {
- cin >> i;
- }
- unordered_set<string> s;
- s.insert(a[0]);
- for (int i = 1; i < n; i++) {
- if (a[i].front() != a[i - 1].back() || s.count(a[i])) {
- cout << "NO" << '\n';
- cout << i + 1 << '\n';
- return 0;
- }
- s.insert(a[i]);
- }
- cout << "YES" << '\n';
- }
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