@[huangxinyou](/user/1121438) \
哪道?
by a13968943778 @ 2023-12-03 21:04:21
@[a13968943778](/user/1221432) p1733
by wish_light @ 2023-12-24 13:48:51
我遇到了和你相同的问题，实际上循环条件应为 $l\le r$，想想为什么？
by 0x824EE @ 2024-01-08 16:56:03