백준 2346번
https://www.acmicpc.net/problem/2346

문제

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생각하기

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• Deque 문제이다.

• 그냥 LinkedList 쓰면 바로 메모리 초과 발생함.

동작

결과

코드

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import java.io.*;
import java.util.*;

public class Main {

    // input
    private static BufferedReader br;

    // variables
    private static int N;
    private static int[] arr;

    private static class Balloon {
        int num;
        int idx;

        private Balloon(int num, int idx) {
            this.num = num;
            this.idx = idx;
        }
    } // End of Balloon class

    public static void main(String[] args) throws IOException {
        br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        input();

        bw.write(solve());
        bw.close();
    } // End of main()

    private static String solve() {
        StringBuilder sb = new StringBuilder();

        sb.append(1).append(' ');
        int move = arr[0];

        ArrayDeque<Balloon> list = new ArrayDeque<>();
        for (int i = 1; i < N; i++) {
            list.offer(new Balloon(arr[i], i + 1));
        }

        while (!list.isEmpty()) {
            if (move > 0) {
                for (int i = 0; i < move - 1; i++) {
                    list.offer(list.poll());
                }
                Balloon cur = list.poll();
                move = cur.num;
                sb.append(cur.idx).append(' ');
            } else {
                for (int i = 0; i < -move - 1; i++) {
                    list.offerFirst(list.pollLast());
                }
                Balloon cur = list.pollLast();
                move = cur.num;
                sb.append(cur.idx).append(' ');
            }
        }


        return sb.toString();
    } // End of solve()

    private static void input() throws IOException {
        N = Integer.parseInt(br.readLine());

        StringTokenizer st = new StringTokenizer(br.readLine());
        arr = new int[N];
        for (int i = 0; i < N; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }
    } // End of input()
} // End of Main class