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也就是说，读入a,b，那么g[b][a]=1

Posted by Sona at 2009-03-10 20:56:45 on Problem 2446
In Reply To:Wa的同学注意了一下这句话，，，there is a pair of integers (x, y) in each line, which represents a hole in the y-th row, the x-th column. Posted by:iowyh at 2006-07-22 00:41:47 
注意！！！
贡献一个WA
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