We learned how to merge two ordered lists with the two-finger method, and we generalized this to merge k ordered lists, to obtain one sorted list with all the n items. k is a parameter that can be set as needed, as long as 2 ≤ k ≤ n. However, for some values of k it is faster to simply sort all the numbers ignoring the initial order. For which (big O) range of k is worth to merge the lists rather than sort?

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