백준 5430 AC(Java)

https://www.acmicpc.net/problem/5430

5430번: AC

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Java 코드

 

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import java.util.Scanner;
import java.util.Deque;
import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    StringBuilder sb = new StringBuilder();
    

    int t = sc.nextInt();
    for(int i = 0; i < t; i++) {
      Deque<String> q = new LinkedList<>();
      boolean err = false;
      boolean rev = false;
      char[] c = sc.next().toCharArray();
      int n = sc.nextInt();
      String str = sc.next();
      str = str.substring(1, str.length() - 1);
      String[] s = str.split(",");
      for(int j = 0; j < n; j++) q.add(s[j]);

      for(int j = 0; j < c.length; j++) {
        if(c[j] == 'R') rev = !rev;
        else {
          if(!q.isEmpty()) {
            if(rev == false) q.pollFirst();
            else q.pollLast();
          }
          else err = true;
        }
      }

      if(err == true) sb.append("error").append("\n");
      else {
        sb.append("[");
        if(rev == false) {
          while(q.size() > 1) sb.append(q.pollFirst()).append(",");
        }
        else {
          while(q.size() > 1) sb.append(q.pollLast()).append(",");
        }
        if(q.size() == 0) sb.append("]").append("\n");
        else sb.append(q.poll()).append("]").append("\n");
      }
    }

    System.out.println(sb);
  }
}