How should I practice Remove Duplicates from Sorted List?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Bloomberg LP onsite interview problems in FastPrep.

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Remove Duplicates from Sorted List

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Problem statement

Given the head of a nondecreasing singly linked list, delete repeated nodes so that each value appears exactly once. Return the head of the same list after relinking its existing nodes.

Function

deleteDuplicates(head: ListNode) → ListNode

Examples

Example 1

head = [1,1,2]return = [1,2]

The second node with value one is removed.

Example 2

head = [1,1,2,3,3]return = [1,2,3]

Each repeated run is reduced to one node.

Constraints

The list contains between 0 and 10^5 nodes.
-10^9 <= Node.val <= 10^9.
The list is sorted in nondecreasing order.