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Grokking the Coding Interview Patterns

Solution: Intersection of Two Linked Lists

Explore the two-pointer method to identify the intersection node of two linked lists without calculating their lengths. Understand how pointer realignment ensures both lists are traversed evenly, allowing you to determine if and where they intersect. This lesson helps you implement an optimal O(N+M) time and O(1) space solution useful for coding interviews.

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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 ...