Which data structure has the fastest insertion procedure

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Which data structure has the fastest insertion procedure?
A) Binary search tree
B) Ordered array
C) Heap
D) Unordered linked list
E) Ordered linked list

Ravi Garg edited question
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    Suyog Kamat (anonymous)

    @abhijit choudhary in un-ordered it will take O(1) bec u will insert it at d end or beginning of the list, where as in order list 1st ul search the list and insert the new node in ascending or descending order so it take O(n) time ie same as ordered array…… correct ans is D

    Suyog Kamat answered
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      Satyajit Bhadange (anonymous)

      Complexity of A can be O(n) if skew tree
      Complexity of B will be O(n)
      Complexity of Heap O(log n)
      Complexity of D O(1)
      Complexity of E O(n)

      Satyajit Bhadange answered
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        Anupriya Anu (anonymous)

        its a

        Anupriya Anu answered
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          Satyajit Bhadange (anonymous)

          A cant be the answer…on an average insertion in binary tree takes log n time…and in worst case it will take n comparisons….Correct ans is D as in unordered list element can be inserted anywhere…even at the start of the list…so it will take constant time to insert…

          Satyajit Bhadange answered
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            Vaibhav Srivastava (anonymous)

            Satyajit.. its a) .. it is binary search tree not binary tree

            Vaibhav Srivastava answered
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