Map Hash Tables and Dictionaries_Part_9

Map Hash Tables and Dictionaries_Part_9 - Sorted List...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Last Updated: 06/02/12 10:23 PM CSE 2011 Prof. J. Elder - 41 - Ordered Search Tables Performance: find takes O (log n ) time, using binary search insert takes O ( n ) time since in the worst case we have to shift n items to make room for the new item remove takes O ( n ) time since in the worst case we have to shift n items to compact the items after the removal A search table is effective only for dictionaries of small size or for dictionaries on which searches are the most common operations, while insertions and removals are rarely performed (e.g., credit card authorizations)
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Last Updated: 06/02/12 10:23 PM CSE 2011 Prof. J. Elder - 42 - More on Binary Search
Image of page 2
Last Updated: 06/02/12 10:23 PM CSE 2011 Prof. J. Elder - 43 - Define Problem: Binary Search PreConditions Key 25
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Sorted List PostConditions Find key in list (if there). 3 5 6 13 18 21 21 25 36 43 49 51 53 60 72 74 83 88 91 95 3 5 6 13 18 21 21 25 36 43 49 51 53 60 72 74 83 88 91 95 Last Updated: 06/02/12 10:23 PM CSE 2011 Prof. J. Elder - 44 - Define Loop Invariant Maintain a sublist. If the key is contained in the original list, then the key is contained in the sublist. key 25 3 5 6 13 18 21 21 25 36 43 49 51 53 60 72 74 83 88 91 95 Last Updated: 06/02/12 10:23 PM CSE 2011 Prof. J. Elder - 45 - Define Step Cut sublist in half. Determine which half the key would be in. Keep that half. key 25 3 5 6 13 18 21 21 25 36 43 49 51 53 60 72 74 83 88 91 95 If key ≤ mid , then key is in left half. If key > mid , then key is in right half. mid...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern