Question: For sorting a data list with n data items, if this data list has been already sorted, the time complexity of classical quick sort algorithm

For sorting a data list with n data items, if this data list has been already sorted, the time complexity of classical quick sort algorithm is o(n^2). Please list two ways to revise the quick sort to make the revised quick sorts time complexity be o(nlgn) when sorting the data list that has been already sorted.

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