题解 | #MP3光标位置#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int total = sc.nextInt();
        int index = 1;
        int pos = 1;
        String directives = sc.next();
        for (int i = 0; i < directives.length(); i++) {
            char ch = directives.charAt(i);
            switch (ch) {
                case 'U':
                    if (index > 1) {
                        index -= 1;
                        if (pos == 1) {
                            pos = 1;
                        } else {
                            pos -= 1;
                        }
                    } else if (index == 1) {
                        index = total;
                        pos = Math.min(total, 4);
                    }
                    break;
                case 'D':
                    if (index == total) {
                        index = 1;
                        pos = 1;
                    } else if (index < total) {
                        index += 1;
                        if (pos == 4 || pos == total) {
                            pos = Math.min(total, 4);
                        } else {
                            pos += 1;
                        }
                    }
                    break;
            }
        }
        for (int i = 0, j = pos - 1; i < pos - 1; i++, j--) {
            System.out.print(index - j + " ");
        }
        for (int i = pos, j = 0; i <= Math.min(total, 4); i++, j++) {
            System.out.print(index + j + " ");
        }
        System.out.println();
        System.out.println(index);
    }
}