题目

单项选择题

Consider sorting a list of n integers, what is the time complexity of the standard merge sort implementation if we know in advance that the input list is already sorted? Note: n is the number of elemenets in the list.

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To evaluate the time complexity, we first recall how a standard merge sort operates: it recursively splits the list into halves until single elements are reached, and then merges sorted halves back together. Each level of merging processes all n elements, and there are log n levels of recursion, giving a baseline of O(n log n) time in the usual, non-optimized scenario. O......Login to view full explanation

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