I need to know a way to remove elements in O(1) time . I used hash table , put the values as keys but there is a problem that the values are not distinct . Is there a way to remove elements in O(1) time if they aren't distinct ?
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I'm not exactly sure of what you mean, but using a linked list seems to be the solution to your problem.
No , I don't think that it will work . What I meant is that assume you have an array of numbers . You perform some operations and then come up with a number , you want to delete this element from the array in O(1) time . I want to know what is the best data structure to use at this moment .
Do you want to delete an element with value x, or an element with index x?
an element with value x .
You could use a hash table of vectors where each entry of the hash table consist of the list of indexes of that value that you want to delete. If you want to select a particular index in O(1) time, you can compress the indexes.
thanks I will try this way .