[프로그래머스][Java] 전화번호 목록

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import java.util.*; class Solution { public boolean solution(String[] phone_book) { boolean answer = true; for(int i=0; i<phone_book.length; i++){ for(int j=i+1; j<phone_book.length; j++){ if(phone_book[j].startsWith(phone_book[i])) return false; if(phone_book[i].startsWith(phone_book[j])) return false; } System.out.println(phone_book[i]); } return answer; } }