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Re: by one smaller than the length of the previous step

Posted by xianyunsc at 2005-08-17 21:42:02 on Problem 2590
In Reply To:Re: by one smaller than the length of the previous step Posted by:tcxgsy at 2005-08-17 20:58:36 
应该是这个意思吧：
steps 可以是：
1 2 3 4 3 2
1 2 3 4 4 4 
1 2 3 4 3 3
不需要对称的
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