输入整数N,输出相应方阵。
一个整数N。( 0 < n < 10 )
一个方阵,每个数字的场宽为3。
5
1 1 1 1 1 2 2 2 2 1 3 3 3 2 1 4 4 3 2 1 5 4 3 2 1
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