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Grokking the Coding Interview Patterns in C#

Solution: Intersection of Two Linked Lists

Understand how to apply the two-pointer technique to detect the intersection node of two singly linked lists. This lesson helps you implement an optimal algorithm that aligns pointers by traversing both lists without explicit length calculations, achieving efficient time and constant space complexity.

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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 ...