Toastman came up with a very easy task. He gives it to Appleman, but Appleman doesn't know how to solve it. Can you help him? Given a n ?×? n checkerboard. Each cell of the board has either character ' x ', or character ' o '. Is it true
Toastman came up with a very easy task. He gives it to Appleman, but Appleman doesn't know how to solve it. Can you help him?
Given a n ?×? n checkerboard. Each cell of the board has either character ' x ', or character ' o '. Is it true that each cell of the board has even number of adjacent cells with ' o '? Two cells of the board are adjacent if they share a side.
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