參考資料 https://vjudge.net/problem/%E8%AE%A1%E8%92%9C%E5%AE%A2-41398 https://blog.nowcoder.net/n/f0bd2cc187464fc997cf779029fc5240 https://www.twblogs.net/a/5d85b5dfbd9eee541c34a339 https://potassiumwings.github.io/2019/09/15/2019icpcshanghaiinternet/ https://blog.csdn.net/song_hai_lei/article/details/1……