Why the cell [6][4] is 'W' in the output?
We changed this cell 138 times.
I think it must be 'B' as in input.
Can U explain me?

Please, Answer me.
I know, that I'm wrong, 'cuz there are a lot of ACers.
Can U explain me my mistake?

Because a[2,1] can step on it

Edited by author 27.08.2009 16:14