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Grokking the Coding Interview Patterns in JavaScript

Solution: Intersection of Two Linked Lists

Explore the two pointers technique to determine the intersection node of two singly linked lists. Understand how switching pointers between lists equalizes traversal lengths, allowing detection of the shared node without calculating list sizes or additional storage. This method helps optimize linked list manipulation in 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 ...