Leetcode Problem 1721. Swapping Nodes in a Linked List

1721. Swapping Nodes in a Linked List

Leetcode Solutions

Single Pass Approach

  1. Initialize three pointers: currentNode to head, frontNode to None, and endNode to None.
  2. Traverse the list with currentNode, keeping a count of the nodes traversed in listLength.
  3. When listLength equals k, set frontNode to currentNode and also start endNode from head.
  4. Continue traversing with currentNode and start moving endNode one step at a time.
  5. When currentNode reaches the end of the list, endNode will be at the kth node from the end.
  6. Swap the values of frontNode and endNode.
  7. Return the head of the modified list.
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Two Pass Approach

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