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这个程序似乎是错的。

Posted by aoxboxcox at 2009-10-26 12:30:45 on Problem 1184
In Reply To:BFS也能做到0MS，这个世界太疯狂了，贴代码 Posted by:yzhw at 2009-08-05 23:17:26

输入：507203 709204
应该输出：9
程序输出：10

过程：
step1: up
step2: up //把5变成7
step3: swap1 //交换第一个和最后个
step4: down //把4变成3
step5: swap1 //交换回来
step6: right
step7: right //移到7的位置
step8: up
step9: up //把它变成9

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