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Grokking the Coding Interview Patterns in C++

Solution: Intersection of Two Linked Lists

Explore the two pointers approach to identify the node where two singly linked lists intersect. This lesson explains how to align traversal without measuring lengths explicitly, ensuring both pointers meet at the intersection or return null if none exists. You'll understand a method with linear time and constant space complexity applicable to common linked list problems.

We'll cover the following...

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 ...