g0901_1000.s0978_longest_turbulent_subarray

Class Solution

java.lang.Object

g0901_1000.s0978_longest_turbulent_subarray.Solution

public class Solution
extends Object

978 - Longest Turbulent Subarray.

Medium

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:

• For i <= k < j:
  • arr[k] > arr[k + 1] when k is odd, and
  • arr[k] < arr[k + 1] when k is even.
• Or, for i <= k < j:
  • arr[k] > arr[k + 1] when k is even, and
  • arr[k] < arr[k + 1] when k is odd.

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 * 104
• 0 <= arr[i] <= 109

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	maxTurbulenceSize(int[] arr)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

maxTurbulenceSize

public int maxTurbulenceSize(int[] arr)