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Grokking the Coding Interview Patterns in C++

Solution: Intersection of Two Linked Lists

Explore how to determine the intersection point of two singly linked lists using the two pointers technique. Understand how to align traversal paths implicitly without length calculations and implement an efficient algorithm with linear time and constant space complexity.

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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.

  • The number of nodes of listBlistB is in the nn ...