Sorting Algorithms: Level 2 challenges Practice Problems Online

Given a list of $n$ strings each of length $n$ . What will be the worst case running time of sorting the strings in lexicographic order using merge-sort algorithm?

Which sorting technique is the best for a list which is mostly sorted?

Which type of sorting technique is best for sorting a linked list?

Do you know why?

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Sorting Algorithms: Level 2 challenges