It does not matter! The key is...

來源: 群眾丁 於 2009-04-30 10:29:14 [] [舊帖] [給我悄悄話] 閱讀數 : (254 bytes)
回答: 紅色單位正方形問題解答 由 群眾丁 於 2009-04-29 10:12:31

The colors of the diagonal squares do not matter. A non-red diagonal square needs to contact only one red square, and a red square needs to contact only one red square as well. The key is a diagonal square does not side-contact any other diagonal square.

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