896. Monotonic Array*
896. Monotonic Array* https://leetcode.com/problems/monotonic-array/ 题目描述 An array is monotonic if it is either monotone increasing or monotone decreasing. An array A is monotone increasing if for all i <= j, A[i] <= A[j] . An array A is monotone decreasing if for all i <= j, A[i] >= A[j] . Return true if and only if the given array A is monotonic. Example 1: Input: [ 1,2,2,3 ] Output: true Example 2: Input: [ 6,5,4,4 ] Output: true Example 3: Input: [ 1,3,2 ] Output: false Example 4: Input: [ 1,2,4,5 ] Output: true Example 5: Input: [ 1,1,1 ] Output: true Note: 1 <= A.length <= 50000 -100000