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Grokking the Coding Interview Patterns in Go

Circular Array Loop

Explore how to detect cycles in a circular array of integers by applying fast and slow pointer techniques. Understand how to identify sequences where all numbers share the same sign and cycles involve at least two indices. This lesson helps you implement and validate solutions efficiently within given constraints.

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Statement

There is a circular list of non-zero integers called nums. Each number in the list tells you how many steps to move forward or backward from your current position:

  • If nums[i] is positive, move nums[i] steps forward.

  • If nums[i] is negative, move nums[i] steps backward.

As the list is circular:

  • Moving forward from the last element takes you back to the first element.

  • Moving backward from the first element takes you to the last element.

A cycle in this list means:

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