Question: Given k sorted sequences each of which has n elements, design an efficient algorithm to sort all kn elements into one sorted sequence. What is

Given k sorted sequences each of which has n elements, design an efficient algorithm to sort all kn elements into one sorted sequence. What is the time complexity of your algorithm?

Whenever a question asks for designing an algorithm, the following three steps are needed.

First, describe the algorithm in English (not pseudo code),
Second, show why the algorithm is correct; and
Third, analyse the complexity of the algorithm.

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