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Grokking the Coding Interview Patterns in C++

Intersection of Two Linked Lists

Explore how to identify the intersection node of two singly linked lists by applying the two pointers technique. This lesson guides you through understanding the problem constraints, logic behind shared nodes in memory, and implements a clear and efficient method to solve this common coding interview question.

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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 ...