$l,r$ 还没有赋值就判断是否交换
by Bulyly @ 2022-12-06 23:35:56
@[1105Lee](/user/295398)
orz，感谢大佬，是我猪脑冒烟了
by sdfsl @ 2022-12-07 17:09:20
@[1105Lee](/user/295398) %
by DGH_Didi @ 2023-02-02 11:58:47