Question: Consider the sequence 2 7 , 5 6 , 4 7 , 7 2 , 2 0 , 5 5 , 4 9 , 9

Consider the sequence 27,56,47,72,20,55,49,90.
(a) Illustrate how to compute the number of inversions in the sequence in time O(n log(n)).
(b) While the number of inversions can be as large as quadratic in n,
the running time to count the inversions is subquadratic. Explain why this is so.

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