Problem

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棋盘

Problem

棋盘格的颜色由数字 1 和 0 有条件地编码。黑色 - 1，白色 - 0。棋盘的左上角是黑色。 
对于给定的数字 n， 显示棋盘大小的颜色代码表 n by n.

 
例子
<头> <正文>

time 1000 ms
memory 256 Mb
Rules for program design and list of errors in automatic problem checking

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# 输入 输出
1 4 [[1 0 1 0]
 [0 1 0 1]
 [1 0 1 0]
 [0 1 0 1]]
2 3 [[1 0 1]
 [0 1 0]
 [1 0 1]]