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Consider n chords on a circle, each defined by its endpoints. Describe and O(nlg n) time algorithm for determining the number of pairs of chords

Consider n chords on a circle, each defined by its endpoints. Describe and O(nlg n) time algorithm for determining the number of pairs of chords that intersect inside the circle. (For example, if the n chords are all diameters that meet at the center, then the correct answer is ). Assume the no two chords share an endpoint.

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