自己写的1、只移动光标2、普通翻页3、第一首和最后一首互翻

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) { 
            String str = in.nextLine();
            int n = Integer.valueOf(str);
            String order = in.nextLine();
            int now = 1;
            int screenUp = 1;
            int screenDown = 4;
            if (n < 4) {
                screenDown = n;
            }
            for (int i = 0; i < order.length(); i++) {
                if (order.charAt(i) == 'U') {
                    if (n <= 4) {
                        if (now == 1) {
                            now = n;
                        } else {
                            now--;
                        }
                    } else {
                        if (now == 1) {
                            now = n;
                            screenDown = n;
                            if (n > 4) {
                                screenUp = n - 3;
                            }
                        } else if (now == screenUp) {
                            now--;
                            screenUp--;
                            screenDown--;
                        } else {
                            now--;
                        }
                    }
                } else if (order.charAt(i) == 'D') {
                    if (n <= 4) {
                        if (now == n) {
                            now = 1;
                        } else {
                            now++;
                        }
                    } else {
                        if (now == n) {
                            now = 1;
                            screenUp = 1;
                            screenDown = 4;
                        } else if (now == screenDown) {
                            now++;
                            screenUp++;
                            screenDown++;
                        } else {
                            now++;
                        }
                    }
                }
            }
            for (int i = screenUp; i <= screenDown; i++) {
                System.out.print(i + " ");
            }
            System.out.println();
            System.out.println(now);
        }
    }
}