@[ARTL](/user/420063)
by DWT8125 @ 2021-01-31 17:02:21
你没考虑到reg%10且ISBN码不正确的情况
by DWT8125 @ 2021-01-31 17:06:18
给你推荐一道比较简单的橙题[P5742](https://www.luogu.com.cn/problem/P5742)
by DWT8125 @ 2021-01-31 17:10:02
@[AC_chenpeizhe20](/user/390228)
好的，万分感谢！
by ARTL @ 2021-01-31 20:23:02
@[ARTL](/user/420063) ~~**求关注**~~
by DWT8125 @ 2021-01-31 20:59:21
不用谢' - '
by DWT8125 @ 2021-01-31 21:09:24