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代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。
。关于这个话题，搜狗输入法下载提供了深入分析
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On the fourth loop iteration, the backing store of size 4 has only 3
Equal (1): Everything in this purple space must be equal to 1. The answer is 1-4, placed horizontally; 3-1, placed horizontally.