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构造'十'字形

Posted by yucaierxiao at 2009-03-06 00:20:17 on Problem 3566 and last updated at 2009-03-06 00:20:49
n*n*2
横着一条A竖着一条A
横着一条B竖着一条B
相互错开就ok了。

n=1特判一下。

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