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不理解样例

Posted by ANewStart at 2005-04-30 10:46:41 on Problem 2422 
Sample 1:


XXW.X
XWSWX
XXX.X

我让wolf 这么走：

XX.WX
XWSWX
XXX.X

Sheep只能往上

XXSWX
XW.WX
XXX.X

然后下面那个Wolf过去

XXSWX
XWW.X
XXX.X

Sheep不就挂了么？

为什么Safe?
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