Grokking the Coding Interview: Patterns for Coding Questions
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Solution: Problem Challenge 3: Cycle in a Circular Array
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Problem Statement

We are given an array containing positive and negative numbers. Suppose the array contains a number ‘M’ at a particular index. Now, if ‘M’ is positive we will move forward ‘M’ indices and if ‘M’ is negative move backwards ‘M’ indices. You should assume that the array is circular which means two things:

  1. If, while moving forward, we reach the end of the array, we will jump to the first element to continue the movement.
  2. If, while moving backward, we reach the beginning of the array, we will jump to the last element to continue the movement.

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