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Re:怎么wa，谢谢啊

Posted by lijian430421 at 2012-03-16 11:00:57 on Problem 1979
In Reply To:怎么wa，谢谢啊 Posted by:skogt at 2010-07-20 10:23:35 
Isok(int a int b)写错了
应该是 if(a<0 || b<0 || a>=n || b>=m) return false;
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