Thread: Delete an item from a linked list

  1. #1
    Join Date
    Apr 2015

    Delete an item from a linked list

    Hi gentlemen, there's something really confusing me which is:
    how would I delete an item from a linked list when all
    I get is the item itself. ?

    any reasonable approach to share with me? thanks alot.

    I've wrote a code but the time complexity is O(n) (searching for the element and if found => delete it ) , I need to decrease the time complexity of deletion ..

  2. #2
    and the hat of int overfl Salem's Avatar
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    Aug 2001
    The edge of the known universe
    Show us your code.
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  3. #3
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  4. #4
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Quote Originally Posted by RyanC
    I need to decrease the time complexity of deletion
    Use a doubly linked list instead, upon which deletion given a pointer to the node becomes a constant time operation. If you insist on a singly linked list, then change it such that you receive a pointer to the previous node instead, with some special case for the head. If you insist on having both a singly linked list and receiving a pointer to the node to be deleted, then you either accept a linear time average and worst case, or you commit seppuku. Good luck!
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
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