백준1316: 그룹 단어 체커

문제

https://www.acmicpc.net/problem/1316

문제 풀이

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int cnt = 0;

        for (int i = 0; i < n; i++) {
            if (check(sc.next())) {
                cnt++;
            }
        }

        System.out.println(cnt);
    }

    public static boolean check(String word) {
        boolean[] alphabet = new boolean[26];
        int prev = 0;

        for (int i = 0; i < word.length(); i++) {
            int now = word.charAt(i);

            if (prev != now) {
                if (!alphabet[now - 'a']) {
                    alphabet[now - 'a'] = true;
                    prev = now;
                } else {
                    return false;
                }
            }
        }
        return true;
    }
}