题解 | #MP3光标位置#

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

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());
        char[] commands = scanner.nextLine().toCharArray();

        int top = 1;
        int cur = 1;
        for (char command : commands) {
            switch (command) {
                case 'U':
                    if (cur == 1) {
                        cur = n;
                        if (cur > 4) {
                            top = cur - 3;
                        } else {
                            top = 1;
                        }
                    } else {
                        cur--;
                        if (top > cur) {
                            top = cur;
                        }
                    }
                    break;
                case 'D':
                    if (cur == n) {
                        top = cur = 1;
                    } else {
                        cur++;
                        if (cur > top + 3) {
                            top++;
                        }
                    }
                    break;
            }
        }
        int max = Math.min(top + 3, n);
        for (int i = top; i <= max; i++) {
            System.out.print(i);
            if (i != max) {
                System.out.print(" ");
            }
        }
        System.out.println();
        System.out.println(cur);
    }

}