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Grokking the Coding Interview Patterns in Go

Solution: Intersection of Two Linked Lists

Explore how to use the two-pointer approach to identify the intersection node of two singly linked lists without explicitly calculating their lengths. This lesson helps you understand pointer alignment, traversal of lists, and an efficient linear time O(N+M) and constant space O(1) solution for linked list intersection problems.

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Statement

You are given the heads of two singly linked lists, headA and headB, to determine whether the two lists intersect. If they intersect, return the node where the intersection begins. Otherwise, return NULL.

Note: Linked lists intersect if they share a common node in memory, not just a node with the same value.

Constraints:

  • 1≤1 ≤ node.val ≤105≤ 10^5

  • The number of nodes of listAlistA is in the mm ...