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涂色是排列组合应用的一类特殊问题,计数时易重复、遗漏,为此指点迷津, 介绍两种可靠的分类评数法。方法一：区域分类法。以涂色区域为对象,选取一对不相邻的区域,按照它们所涂的颜色相同和不同两种情况分类计算。
Coloring is a special problem in the application of permutation and combination. Counting is easy to repeat and omission. For this purpose, two reliable classification evaluation methods are introduced. Method One: Regional Taxonomy. For the painted area, select a pair of non-adjacent areas and classify them according to the same or different colors.