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数据结构课上老师教过……

Posted by dreamcoder at 2010-12-06 21:05:55 on Problem 3984 
数据结构课上老师貌似教过，让小人没走一步都判断前后左右哪里能走得通，走不通的存到一个栈里，下回不走，效率蛮高的
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