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首先原来的295行是少了个参数的。那按照我的理解,这里应该是将随机位置元素交换到最右边。
然后重新把改过的代码运行发现sort([4,3,5,5,4,5])是会得到[3,4,5,5,4,5]的,那按照我的理解,应该需要加上308行这样,去交换小于基准值和等于基准值两者的位置。