[프로그래머스]#42577 전화번호 목록

문제

https://programmers.co.kr/learn/courses/30/lessons/42577

풀이

class Solution {
    public boolean solution(String[] phone_book) {
        boolean answer = true;
        for(int i=0; i<phone_book.length; i++){
            for(int j=0; j<phone_book.length; j++){
                if(i!=j) {
                    if(phone_book[i].length()>phone_book[j].length())
                        continue;
                    else{
                        if(phone_book[i].equals(phone_book[j].substring(0,phone_book[i].length())))
                        return false;
                    }
                }
            }
        }
        return answer;
    }
}