构造 NXN 阶的拉丁方阵(2<=N<=9)，使方阵中的每一行和每



一列中数字1到N只出现一次。如N=4时：

1 2 3 4

2 3 4 1

3 4 1 2

4 1 2 3-tectonic NxN bands Latin matrix (2lt; = Nlt; = 9), phalanx of each line and each series of numbers from 1 to N has only appeared once. If N = 4 : 1 2 3 4 2 3 4 1 3 4 1 2 4 1 2 3