Day 32 — Copy List with Random Pointer

Day 32 — Copy List with Random Pointer

A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.


Hey Guys, Today is day 32 **of the challenge that I took. Wherein I will be solving every day for 100 days the [programming questions]( that have been asked in previous interviews.**

You have a bonus at the end if you keep reading. You can find out the companies that have asked these questions in real interviews.

All these problems are taken from the following [e-book_]( 🎓_

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Day 32- Copy List with Random Pointer🏁


A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.

Return a deep copy of the list.

The Linked List is represented in the input/output as a list of n nodes. Each node is represented as a pair of [val, random_index] where:

  • val: an integer representing Node.val
  • random_index: the index of the node (range from 0 to n-1) where random pointer points to, or null if it does not point to any node.


Input: head = [[7,null],[13,0],[11,4],[10,2],[1,0]]
Output: [[7,null],[13,0],[11,4],[10,2],[1,0]]

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