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请教一下冒泡排序中，for passnum in range(len(alist)-1, 0, -1)为什么要这样写range(len(alist)-1,0,-1) #24

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emmalovestudy opened this issue Jun 8, 2020 · 1 comment
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请教一下冒泡排序中，for passnum in range(len(alist)-1, 0, -1)为什么要这样写range(len(alist)-1,0,-1) #24

emmalovestudy opened this issue Jun 8, 2020 · 1 comment

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@emmalovestudy
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@LucisXu
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LucisXu commented Jul 10, 2020

第一次循环是需要循环到最后一个数，因此第一次的下标为len(alist)-1即最后一个数，第一次循环结束后最后一个数最大，也就意味着下一次的循环到倒数第二个数即可，因此括号里最后为-1。依次类推直到第二个数，因此括号的中间为0。

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@LucisXu @emmalovestudy