这是周赛第 286 场的第三题，难度 Medium ，主要考查的是查找指定大小和指定位置上的回文数，如果知道回文数的规律很好解决

Intro, Collaborative Filtering and Content-based Filtering

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Tech

其实break和continue退出for循环的用法和退出while的用法是一样的。break，当某些条件成立退出循环，后面代码不执行，终止整个循环；continue，当某些条件成立终止当前循环继而执行下次循环。下面用2个代码示例来看看一下怎么使用以及执行结果。