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3221题 给的例子好像有点问题

Posted by newbgirl at 2007-06-18 21:51:27 on Problem 3221 
不知道是不是我搞晕了

0123456--〉4123056--〉4120356--〉6120354--〉3120654--〉3420651--〉1420653--〉2410653

明明可以到达的阿，怎么输出-1呢

奇怪，我理解错了吗，望指点
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