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Grokking the Coding Interview Patterns in Python

Solution: Intersection of Two Linked Lists

Explore how to determine if two singly linked lists intersect and find the intersecting node using the two-pointer technique. Understand how to align pointers without length calculations for efficient traversal and constant space use.

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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 ...