送交者: lakeblue 于 December 03, 2009 21:24:30:
回答: 每行或每列的和可以是1,3,5,7 由 不知答案 于 December 03, 2009 20:41:17:
For instance, putting one marker on the corner and making the rest 7x7 subspace all occupied is also one way.
加跟贴
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