纪律和规则不只是约束我们，而是在纠正我们的错误，培养我们的良好习惯，所以，我们要规范自己的一言一行。

The discipline and rules not only restrain us, but also correct our mistakes, and develop our good habits. So we have to regulate our behavior.

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最后发现其解决方式还是非常简单的(只需要100行Python代码)，它基于以下两个想法：约束传播和查找。

It turns out to be quite easy (about 100 lines of [Python] code) using two ideas: constraint propagation and search.

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第15、16、17行定义了约束。

Lines 15, 16, and 17 define the constraints.

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