题解 | #MP3光标位置#

def function2(songlist, cur_window, cur_song, commands):
    commands = list(commands[::-1])
    while commands:
        command = commands.pop()
        if cur_window[cur_song] == songlist[0] and command == 'U':
            cur_window = songlist[-4:]
            cur_song = 3
        elif cur_window[cur_song] == songlist[-1] and command == 'D':
            cur_window = songlist[:4]
            cur_song = 0
        elif cur_song == 0 and cur_window[cur_song] != songlist[0] and command == 'U':
            cur_window = [x-1 for x in cur_window]
            cur_song = 0
        elif cur_song == 3 and cur_window[cur_song] != songlist[-1] and command == 'D':
            cur_window = [x+1 for x in cur_window]
            cur_song = 3
        elif cur_song in [1, 2, 3] and command == 'U':
            cur_song -= 1
        elif cur_song in [0, 1, 2] and command == 'D':
            cur_song += 1
    return [cur_window, cur_song] 

def function1(songlist, cur_window, cur_song, commands):
        commands = list(commands[::-1])
        while commands:
            command = commands.pop()
            if cur_song == 0 and command == 'U':
                cur_song = len(songlist) - 1
            elif cur_song == len(songlist) - 1 and command == 'D':
                cur_song = 0
            elif cur_song in range(1, len(songlist)) and command == 'U':
                cur_song -= 1
            elif cur_song in range(0, len(songlist)-1) and command == 'D':
                cur_song += 1
        return [cur_window, cur_song]
    
while True:
    try:
        n = int(input())
        commands = input()
        songlist = [i for i in range(1, n+1)]
        cur_window = songlist[:4] if n >= 4 else songlist
        cur_song = 0

        if len(songlist) < 4:
            cur_window, cur_song = function1(songlist, cur_window, cur_song, commands)
        elif len(songlist) >= 4:
            cur_window, cur_song = function2(songlist, cur_window, cur_song, commands)
        
        cur_window_str = ''
        for i in range(len(cur_window)):
            if i == 0:
                cur_window_str = str(cur_window[i])
            else:
                cur_window_str = cur_window_str + ' ' + str(cur_window[i])

        print(cur_window_str)
        print(cur_window[cur_song])
    
    except:
        break