It's going to let j run over the length of the list all right, so it's going to start at some point to move down, and then it's going to let i run over range, that's just one smaller, and what's it doing there?

就在这里，会做什么呢？,我们让j遍历这个列表,好的，它要从某一定开始移动,然后让i也跑遍整个范围，就是比之要小一，会发生什么？

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