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Grokking the Coding Interview Patterns in Python

Solution: Intersection of Two Linked Lists

Understand how to use two pointers to detect the intersection node in two singly linked lists. This lesson teaches you to align pointers without measuring list lengths, achieving efficient traversal and constant space usage. Gain the skills to implement this technique for detecting shared nodes and handling cases with no intersection.

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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 ...