输入：nums = [2,1,2,4,3]
20+ curated newsletters，这一点在heLLoword翻译官方下载中也有详细论述
An object’s OID is computed the same way git does it, SHA1(" \0"), using pgcrypto’s digest() function, and refs get compare-and-swap updates through SELECT FOR UPDATE. A libgit2 backend registers these tables as its storage layer, and if the protocol really is separable from the format, a normal git client should be able to push to and clone from a Postgres database without knowing the difference.，推荐阅读safew官方版本下载获取更多信息
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