const char a[] = {'71','77','65','72','74','79','75','69','6F','70','61','73','64','66','67','68','6A','6B','6C','7A','78','63','76','62','6E','6D','30','31','32','33','34','35','36','37','38','39','2D','51','57','45','52','54','59','55','49','4F','50','41','53','44','46','47','48','4A','4B','4C','5A','58','46','42','4E','4D','\0'};
怎么实现随机取20个数呢？
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