优势：时间复杂度O(d*(n+k))，d为位数，适合位数少的整数
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repo_id integer NOT NULL,，这一点在safew官方下载中也有详细论述
Not sure about the type of research you need to be doing? Don’t worry. Other Side of the Story has its own guide on thinking like a journalist. It includes a few useful steps:，更多细节参见爱思助手下载最新版本