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Longest Turbulent Subarray

Given an integer array arr, return the length of a maximum size turbulent subarray of arr.

Given an integer array arr, return the length of a maximum size turbulent subarray of arr.

A subarray is turbulent if the comparison sign flips between each adjacent pair of elements in the subarray.

More formally, a subarray [arr[i], arr[i + 1], ..., arr[j]] of arr is said to be turbulent if and only if:

Longest Turbulent Subarray diagram

Example 1

Input: arr = [9,4,2,10,7,8,8,1,9]

Output: 5

Explanation: arr[1] > arr[2] < arr[3] > arr[4] < arr[5]

Example 2

Input: arr = [4,8,12,16]

Output: 2

Example 3

Input: arr = [100]

Output: 1

Constraints

  • 1 <= arr.length <= 4 * 10^4
  • 0 <= arr[i] <= 10^9

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