这种策略是基于正确放置的笔记。有时,它也叫做“唯一余数”。关键在于在一个特定的单元格中,只剩一个可能的数字(来自笔记)。
我们来看看这种情况的例子。
看看突出显示的单元格。我们可以看到它只填了一条笔记:数字 2。这说明这个单元格只有一种可能的解法。由于这是唯一可能的选项,所以这个单元格将为 2。因此,我们删除这个单元格中的笔记,并填上数字 2。
这就是“显性单一数”解法的原理。可以看到,这并不像看上去那么难。因此,如果您将“显性单一数”解法付诸实践,解答数独的过程将变得更轻松快速!
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