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Note that the frog can jump over an adjacent approaching car in the same lane as itself.

Posted by sasnzy at 2006-09-12 19:15:24 on Problem 3000 
这句话什么意思? 青蛙可以跳过同一行的一辆车? F-X-O(假设车向左移动) 跳完以后是X-F-O?
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