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Grokking the Coding Interview Patterns in Go

Solution: Intersection of Two Linked Lists

Explore the two-pointer technique to determine if two singly linked lists intersect and identify the intersection node. This lesson teaches you to traverse both lists efficiently without extra space, aligning pointers to find the shared node or confirm no intersection exists.

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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 ...