12.4 - Basic Ranking and Inversions
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Practice Questions
Test your understanding with targeted questions
Define what an inversion is in rankings.
💡 Hint: Think about the opposite ranking of two items.
What is the time complexity of counting inversions using a brute-force approach?
💡 Hint: Consider checking each pair of items.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the definition of an inversion?
💡 Hint: 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).
💡 Hint: Consider the efficiency of merge sort.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Given the rankings [4, 3, 2, 1], calculate the total number of inversions and explain the reasoning.
💡 Hint: 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.
💡 Hint: How does merging relate to counting inversions?
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