(c++) 백준 "1032) 명령 프롬프트"

https://www.acmicpc.net/problem/1032

1032번: 명령 프롬프트

---

#include <iostream>
#include <string>
using namespace std;
int main() {
	int N; cin >> N;
	string answer; cin >> answer;
	for (int i = 1; i < N; i++) {
		string comp; cin >> comp;
		for (int k = 0; k < answer.size(); k++) {
			if (answer[k] != '?' && answer[k] != comp[k]) {
				answer[k] = '?';
			}
		}
	}
	cout << answer << endl;
	return 0;
}