@[小粉兔](/user/10703) @[览遍千秋](/user/28910)
by Eirin_Yagokoro @ 2023-01-16 18:08:51
@[__dest__ruct__or__](/user/592238) 感觉可降可不降，不过我刚想做这题来着，要是掉蓝我就没兴趣做了（大雾
by QAQ__ @ 2023-01-16 18:09:48
不认为这题思维难度只有绿
by dbxxx @ 2023-01-16 18:19:30
@dbxxx认真学过卡特兰数的可能比较容易发现qwq
by ggbooy @ 2023-01-17 19:27:51
@[封禁用户](/user/522694) 做题还能这样吗？？？？
by AThls123 @ 2023-10-26 19:24:10