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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. Understand the method that aligns traversal paths without direct length calculation, ensuring efficient detection of shared nodes. This lesson enables you to apply a space-optimized algorithm with O(N+M) time complexity to solve linked list intersection problems confidently.

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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 ...