12.DivideAndConquer_outside

Log is then log is if 2 is then is if 1 log 1 log log

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Unformatted text preview: ) log ( is ) ( then ), log ( is ) ( if 2. ) ( is ) ( then ), ( is ) ( if 1. log 1 log log log log n f b n af n f n T n n f n n n T n n n f n n T n O n f a k a k a a a b b b b b n n T n T ) 2 / ( 4 ) ( Solution: log b a=2, so case 1 says T(n) is O(n 2 ). © 2004 Goodrich, Tamassia Divide-and-Conquer 11 Master Method, Example 2 The form: The Master Theorem: Example: d n n f b n aT d n c n T if ) ( ) / ( if ) ( . 1 some for ) ( ) / ( provided )), ( ( is ) ( then ), ( is ) ( if 3. ) log ( is ) ( then ), log ( is ) ( if 2. ) ( is ) ( then ), ( is ) ( if 1. log 1 log log log log n f b n af n f n T n n f n n n T n n n f n n T n O n f a k a k a a a b b b b b n n n T n T log ) 2 / ( 2 ) ( Solution: log b a=1, so case 2 says T(n) is O(n log 2 n). © 2004 Goodrich, Tamassia Divide-and-Conquer 12 Master Method, Example 3 The form: The Master Theorem: Example: d n n f b n aT d n c n T if ) ( ) / ( if ) ( . 1 some for ) ( ) / ( provided )), ( ( is ) ( then ), ( is ) ( if 3. ) log ( is ) ( then ), log ( is ) ( if 2. ) ( is ) ( then ), ( is ) ( if 1. log 1 log log log log n f b n af n f n T n n f n n n T n n n f n n T n O n f a k a k a a a b b b b b n n n T n T log ) 3 / ( ) ( Solution: log b a=0, so case 3 says T(n) is O(n log n). © 2004 Goodrich, Tamassia Divide-and-Conquer 13 Master Method, Example 4 The form: The Master Theorem: Example: d n n f b n aT d n c n T if ) ( ) / ( if ) ( . 1 some for ) ( ) / ( provided )), ( ( is ) ( then ), ( is ) ( if 3. ) log ( is ) ( then ), log ( is ) ( if 2. ) ( is ) ( then ), ( is ) ( if 1. log 1 log log log log n f b n af n f n T n n f n n n T n n n f n n T n O n f a k a k a a a b b b b b 2 ) 2 / ( 8 ) ( n n T n T Solution: log b a=3, so case 1 says T(n) is O(n 3 ). © 2004 Goodrich, Tamassia Divide-and-Conquer 14 Master Method, Example 5 The form: The Master Theorem: Example: d n n f b n aT d n c n T if ) ( ) / ( if ) ( . 1 some for ) ( ) / ( provided )), ( ( is ) ( then ), ( is ) ( if 3. ) log ( is ) ( then ), log ( is ) ( if 2. ) ( is ) ( then ), ( is ) ( if 1. log 1 log log log log n f b n af n f n T n n f n n n T n n n f n n T n O n f a k a k a a a b b b b b 3 ) 3 / ( 9 ) ( n n T n T Solution: log b a=2, so case 3 says T(n) is O(n 3 ). © 2004 Goodrich, Tamassia Divide-and-Conquer 15 Master Method, Example 6 The form:...
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log is then log is if 2 is then is if 1 log 1 log log log...

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