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Re:此乃dp

Posted by butter at 2006-10-23 22:12:20 on Problem 2181
In Reply To:此乃dp Posted by:frkstyc at 2006-10-23 21:59:03 
思想是这样的，当前为oddstep时，总数加上往后的第一个降序的第一个数；
当前为evenstep时，总数减去往后第一个升序的第一个数；
最后一个数需要特殊处理就可以了
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