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同样是AC，大家都用了0ms+3M多的内存，我只用了999ms+22M内存。

Posted by gniuxiao at 2007-04-08 20:29:50 on Problem 2081
In Reply To:同样是0ms，大家都用了3M多的内存，我只用了420k。 Posted by:DoWhile_SCUT at 2005-05-03 00:17:56 
> 420大部分是储存某个数是否已被实用，每bit一个数。
> 没有用数组储存a[i]，而储存输入的数据，递推过程中把符合的i对应的a[i]也储存起来，最后按输入数据的顺序输出。
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