Approximation Algorithms
k-Center
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Definition
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2-Approx
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Analysis
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Obtain Better Ratio?
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Weighted k-Center
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Notations
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Algorithm
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Algorithm 2
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Theorem: Alg 2 has an approx ratio of 3.
Multiway Cut and k-Cut
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Example
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Can you prove it???
Approximation
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Minimum k-cut Problem
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Construct a Gomory-Hu Tree
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Properties of Gomory-Hu Tree wrt k-cut
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Approximation Algorithm
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