카드 섞기 -21315번

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내 코드

package com.company;

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

public class Main {
    static int N;
    static int[] arr;
    static LinkedList<Integer> ll = new LinkedList<>();

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

        N = Integer.parseInt(br.readLine());
        arr = new int[N];

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

        for (int i = 0; i < N; i++) {
            ll.add(arr[i]);
        }


        for (int k1 = 1; Math.pow(2, k1) < N; k1++) {
            for (int k2 = 1; Math.pow(2, k2) < N; k2++) {
                boolean check = false;

                ll.clear();
                for (int i = 1; i <= N; i++) {
                    ll.add(i);
                }
                shuffle(k1);
                shuffle(k2);

                for (int i = 0; i < N; i++) {
                    if (arr[i] != ll.poll())
                        break;
                    if (i == N - 1)
                        check = true;
                }

                if (check) {
                    System.out.println(k1 + " " + k2);
                    return;
                }
            }
        }
    }

    static void shuffle(int k) {
        int bot = (int) Math.pow(2, k);
        for (int i = 0; i < bot; i++) {
            ll.add(0, ll.removeLast());
        }

        while (bot / 2 >= 1) {
            for (int i = 0; i < bot / 2; i++) {
                ll.add(0, ll.remove(bot - 1));
            }
            bot /= 2;
        }
    }
}