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How would I go about implementing a function in C++ that swaps the front node and...

How would I go about implementing a function in C++ that swaps the front node and tNode with each other in a singly linked list that has more than two nodes, but I can't swap data? Also what would the Big-O complexity be for this?

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Answer #1

/*If you have any query do comment in the comment section else like the solution*/

1. Traverse the linked list, and store address of nodes in three variable firstNode, secondLastNode and tNode.
2. Now follow below operation
   tNode->next = firstNode->next
   secondLastNode->next = firstNode
   firstNode->next = null
   head = tNode
   return head

Since you have to traverse the complete list once, the time complexity will be O(n)

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