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Grokking the Coding Interview Patterns in C++

Solution: Intersection of Two Linked Lists

Understand how to determine if two singly linked lists intersect by using the two pointers technique. This lesson teaches you an optimal approach that aligns pointers without computing list lengths, ensuring efficient detection of the intersection node or confirming no intersection. Learn to implement this method in C++ with a constant space complexity and linear time performance.

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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 ...