设表的长度为n。下列算法中，最坏情况下比较次数小于n的是 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29840' and id < 2421791 and id<>'2421791' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29840' and id > 2421791 and id<>'2421791' order by id asc limit 5