Remove duplicates from an unsorted doubly linked list

Remove the node from doubly linked list which are exist in more than once. Note that linked list nodes is not an sorted. In this post are given iterative solution of this problem to find duplicates node and deleted all duplicates.

Suppose we are inserted the following (1,1,4,6,6,6,7,8,1) node in a sequence.

Hint of implementation process: We are need two while-loops. Outer loop are used to iterate linked list nodes. and inner loop are find to the duplicates nodes. If inner loop are find repeated node then we are delete this node to linked list. This process are repeated until outer loop are not iterates all nodes of linked list. The time complexity of this process is O(n^2).

Here given code implementation process.

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