Grokking Data Structures & Algorithms for Coding Interviews
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Problem 2: Remove Duplicates from Sorted List (easy)
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Problem Statement:

Given a sorted linked list, remove all the duplicate elements to leave only distinct numbers. The linked list should remain sorted, and the modified list should be returned.

Examples

Example 1:

  • Input: 1 -> 1 -> 2
  • Output: 1 -> 2
  • Justification: Since 1 is repeated, we remove the duplicate to leave a sorted list of unique numbers.

Example 2:

  • Input: 1 -> 2 -> 2 -> 3
  • Output: 1 -> 2 -> 3
  • Justification: Here, 2 is the duplicate element, and by removing it, we obtain a list containing only distinct elements.

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