문제
풀이
#include <iostream>
#include <string>
using namespace std;
bool solve(void) {
int n; cin >> n;
string f; cin >> f;
for (int i=1; i<n; i++) {
string s; cin >> s;
if (s.front() != f.front()) return false;
}
return true;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << solve();
return 0;
}