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algorithm Counting Friends There are n students and each student i has 2 scores ay Students i,j are friends if and only if Xi Uj.

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Counting Friends There are n students and each student i has 2 scores ay Students i,j are friends if and only if Xi Uj. How Inany pairs of friends are there? Design an efficient algorithm. For comparison, our algorithm runs in O(n log n) time

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