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用队列其实很快

Posted by atlas_of_rruucc at 2004-10-17 13:12:26 on Problem 1924
In Reply To:感觉应该不是用队列 Posted by:kicc at 2004-10-17 10:48:54 
> 应该保存每个时刻能够到达的位置，再把这些位置扩展到下一个时刻能够到达的位置
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