如何在500w个单词中统计特定前缀的单词有多少个？

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参考这个：

https://mp.weixin.qq.com/s?__biz=MjM5NTY1MjY0MQ==&mid=2650743528&idx=3&sn=ae59dce7a06faaf6c335ba4abe7348b5&chksm=befeb7a689893eb0883892f8f82c1d2cf92e090c2ee10b99809164fb94cf7934ab7fe645a269&mpshare=1&scene=23&srcid=10229fggrL0DlUWLwBV9dbBQ#rd