Monotonic array

class Solution:
    def isMonotonic(self, nums: List[int]) -> bool:
        increasing = decreasing = True
        for i in range(len(nums) - 1):
            if nums[i] > nums[i + 1]:
                increasing = False
            if nums[i] < nums[i + 1]:
                decreasing = False
        return increasing or decreasing

Monotonic Array

Difficulty: Easy

An array is monotonic if it is either monotone increasing or monotone decreasing.

An array nums is monotone increasing if for all i <= j, nums[i] <= nums[j]. An array nums is monotone decreasing if for all i <= j, nums[i] >= nums[j].

Given an integer array nums, return true if the given array is monotonic, or false otherwise.

 

Example 1:

Input: nums = [1,2,2,3]
Output: true

Example 2:

Input: nums = [6,5,4,4]
Output: true

Example 3:

Input: nums = [1,3,2]
Output: false

 

Constraints:

  • 1 <= nums.length <= 105
  • -105 <= nums[i] <= 105