[记录](https://www.luogu.com.cn/record/109191042)
by The_cosmos @ 2023-04-29 17:58:22
@[The_cosmos](/user/526017) Orz
by lraM416 @ 2023-04-29 18:08:04
@[The_cosmos](/user/526017) 可爱的 WYZ 忘记加 `tot = 1` 了 QAQ
by 喵仔牛奶 @ 2023-04-29 18:25:27
@[喵仔牛奶](/user/560516) chao
by The_cosmos @ 2023-04-29 20:06:27
@[The_cosmos](/user/526017) 萌新求问，为什么45行和48行要这样打，不能直接从0到len吗
by Dream__Sky @ 2023-04-30 22:29:48
@[Dream__Sky](/user/554665) 当然可以，只是习惯问题。
by The_cosmos @ 2023-05-01 07:29:52