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In a singly linked list, how can you find the middle element in one pass?

Practice Questions

Q1
In a singly linked list, how can you find the middle element in one pass?
  1. Use two pointers
  2. Count nodes first
  3. Use recursion
  4. Use a stack

Questions & Step-by-Step Solutions

In a singly linked list, how can you find the middle element in one pass?
  • Step 1: Start with two pointers, 'slow' and 'fast'. Both pointers should begin at the head of the linked list.
  • Step 2: Move the 'slow' pointer one step forward (to the next node) and the 'fast' pointer two steps forward (to the node after the next node).
  • Step 3: Repeat Step 2 until the 'fast' pointer reaches the end of the linked list or there are no more nodes for it to move to.
  • Step 4: When the 'fast' pointer reaches the end, the 'slow' pointer will be at the middle of the linked list.
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