0896. Monotonic Array

https://leetcode.com/problems/monotonic-array

Description

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

Example 4:

**Input:** nums = [1,2,4,5]
**Output:** true

Example 5:

**Input:** nums = [1,1,1]
**Output:** true

Constraints:

• 1 <= nums.length <= 105

• -105 <= nums[i] <= 105

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