How to Solve Circular Array Loop Problem
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Circular Array Loop
You are playing a game involving a circular array of non-zero integers nums. Each nums[i] denotes the number of indices forward/backward you must move if you are located at index i: If nums[i] is posi...
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Understanding the Circular Array Loop Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are playing a game involving a circular array of non-zero integers nums. Each nums[i] denotes the number of indices forward/backward you must move if you are located at index i: If nums[i] is positive, move nums[i] steps forward, and If nums[i] is negative, move nums[i] steps backward. Since the array is circular, you may assume that moving forward from the last element puts you on the first element, and moving backwards from the first element puts you on the last element. A cycle in the array consists of a sequence of indices seq of length k where: Following the movement rules above results in the repeating index sequence seq[0] -> seq[1] -> ... -> seq[k - 1] -> seq[0] -> ... Every nums[seq[j]] is either all positive or all negative. k > 1 Return true if there is a cycle in nums, or false otherwise.
Circular Array Loop
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Get real-time assistance for Circular Array Loop problems during coding interviews. Interview Coder provides instant solutions and explanations.
Examples
nums = [2,-1,1,2,2]trueThe graph shows how the indices are connected. White nodes are jumping forward, while red is jumping backward. We can see the cycle 0 --> 2 --> 3 --> 0 --> ..., and all of its nodes are white (jumping in the same direction).
nums = [-1,-2,-3,-4,-5,6]falseThe graph shows how the indices are connected. White nodes are jumping forward, while red is jumping backward. The only cycle is of size 1, so we return false.
nums = [1,-1,5,1,4]trueThe graph shows how the indices are connected. White nodes are jumping forward, while red is jumping backward. We can see the cycle 0 --> 1 --> 0 --> ..., and while it is of size > 1, it has a node jumping forward and a node jumping backward, so it is not a cycle. We can see the cycle 3 --> 4 --> 3 --> ..., and all of its nodes are white (jumping in the same direction).
Constraints
1 <= nums.length <= 50001000 <= nums[i] <= 1000nums[i] != 0Follow up: Could you solve it in O(n) time complexity and O(1) extra space complexity?How Interview Coder Helps with Leetcode Problems
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