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3 cards from this section. Quick, good the night before a test.
Define what an inversion is in rankings.
Think about the opposite ranking of two items.
What is the time complexity of counting inversions using a brute-force approach?
Consider checking each pair of items.
What is the definition of an inversion?
Think of pairs that are ranked differently.
True or False: A merge sort with inversion counting can achieve time complexity of O(n log n).
Consider the efficiency of merge sort.
Given the rankings [4, 3, 2, 1], calculate the total number of inversions and explain the reasoning.
Think about how each element can be paired with elements to its right.
Design a function that counts inversions in an array. Demonstrate with an example.
How does merging relate to counting inversions?
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