对。那个关于d[4]的质疑是我自己理解有问题。下面的相关帖已修正或删除。另外好像不必考虑k>3的情况。

来源: wxcfan123 于 2023-11-27 12:17:48 [旧帖] [给我悄悄话] 本文已被阅读：次

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