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Update README.md
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README.md

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@@ -5769,6 +5769,7 @@ class Solution:
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- 赋值 a
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- 赋值 b
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- 对比两个有序列表时,我们可以通过`a,b = b,a`的方式指定`a`为第一个数字比较小的那个列表。这样可以避免使用`if`语句而重复相似的代码
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- 递归函数中为了处理特殊情况,可以在开头加一句`if ...: return ...`,而不必引入`else`
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# 隐藏的坑
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- 遍历 set 时,输出是无序的,输出顺序可能随着计算机环境而改变

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