[Java] 백준 - 10845번 : 큐 (Silver IV)

📝 문제

백준 - 10845번 : 큐 (Silver IV)

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📝 풀이

📌 작성 코드

import java.io.*;
import java.util.*;
public class Main {
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int t = Integer.parseInt(br.readLine());
		
		ArrayList<String> queue = new ArrayList<>();
		for (int i = 0; i < t; i++) {
			String[] s = br.readLine().split(" ");
			
			switch (s[0]) {
				case "push":
					queue.add(s[1]);
					break;
				case "pop":
					if (queue.isEmpty()) {
						bw.write("-1\n");
					} else {
						bw.write(queue.get(0) + "\n");
						queue.remove(0);
					}
					break;
				case "size":
					bw.write(queue.size() + "\n");
					break;
				case "empty":
					bw.write(queue.isEmpty() ? "1\n" : "0\n");
					break;
				case "front":
					bw.write(queue.isEmpty() ? "-1\n" : queue.get(0) + "\n");
					break;
				case "back":
					bw.write(queue.isEmpty() ? "-1\n" : queue.get(queue.size()-1) + "\n");
					break;
			}
		}
		
		bw.flush();
		bw.close();
	}
}

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📌 결과