Is there any trick in the problem? -- Problem 2802

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zhangli	4329. Is there any trick in the problem?
2007-04-15 12:56:16	I use a BFS method to  solve this problem ,but I get WA for five times.

ldt116	6538. Re:Is there any trick in the problem?
2008-11-15 17:55:50	I'm too. Anyone can help plz?

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