쉬운 문제라도 문제를 푸는 방법은 다양합니다.
더 명확하고 깔끔한 문제 해결 방법을 아신다면 자유롭게 말씀해주세요.
프로그래머스 번호 제목
프로그래머스 저작권을 침해하지 않기 위해
문제 보시고 싶으시면 버튼을 눌러주세요.
답변 형식
사건 배열 record를 받아 실제 화면에 표시될 문구 배열 answer을 반환한다.
풀이 조건
닉네임은 유저 아이디로 구분하고, Change를 통해 변환 가능하다.
화면에 표시될 문구 배열은
– Enter : “님이 들어왔습니다.”
– Leave : “님이 나갔습니다.”
이다.
JAVA 정답
import java.util.*;
public class P42888 {
class Solution {
public String[] solution(String[] record) {
HashMap<String, String> name = new HashMap<>();
int cnt = record.length;
for(int i=0; i<record.length; i++) {
String line = record[i];
String[] arr = line.split(” “);
if(arr[0].equals(“Change”)) cnt–;
if(arr[0].equals(“Enter”)||arr[0].equals(“Change”)) {
name.put(arr[1], arr[2]);
}
}
String[] answer = new String[cnt];
int q = 0;
for(int i=0; i<record.length; i++) {
String line = record[i];
String[] arr = line.split(” “);
if(arr[0].equals(“Enter”)) {
answer[q++] = name.get(arr[1])+”님이 들어왔습니다.”;
} else if(arr[0].equals(“Leave”)) {
answer[q++] = name.get(arr[1])+”님이 나갔습니다.”;
}
}
return answer;
}
}
}
JAVA 정답 해설
정답 해설은 추후 추가 예정입니다.
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