“唯一候选数”是一种简单策略,适用于初学者。它基于找到缺少的数字。要找到缺少的数字,您应该看看感兴趣的 3×3 宫,以及与之相连的行和列中已经有哪些数字。
我们来看一个例子。
注意突出显示的单元格。看看它的宫、行和列中的数字。我们可以发现这一行、列和宫中已经包含数字 1、2、3、4、6、7、8 和 9。
唯一缺少的数字是 5。考虑到数字不能重复,这个单元格中可以填入的唯一数字必然为 5。
这就是“唯一候选数”解法的原理。掌握它之后,您将开始更轻松快速地解答数独!
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