6 5
1 2 3 3 2 4
by Man_CCNU @ 2021-12-09 16:30:45
我把题想复杂了
by Man_CCNU @ 2021-12-09 16:39:48
@[Man_CCNU](/user/524191) 是对的。
by DitaMirika @ 2021-12-09 16:47:36