Grokking the Coding Interview: Patterns for Coding Questions
Ask Author
Back to course home

0% completed

Solution: Start of LinkedList Cycle
Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Problem Statement

Given the head of a Singly LinkedList that contains a cycle, write a function to find the starting node of the cycle.

Solution

If we know the length of the LinkedList cycle, we can find the start of the cycle through the following steps:

  1. Take two pointers. Let’s call them pointer1 and pointer2.
  2. Initialize both pointers to point to the start of the LinkedList.
  3. We can find the length of the LinkedList cycle using the approach discussed in LinkedList Cycle. Let’s assume that the length of the cycle is ‘K’ nodes.
  4. Move ``pointer2`

.....

.....

.....

Like the course? Get enrolled and start learning!

Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible