# 896. Monotonic Array """ 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. """ class Solution(object): def isMonotonic(self, nums): increasing = True decreasing = True for i in range(1, len(nums)): if nums[i] > nums[i - 1]: decreasing = False elif nums[i] < nums[i - 1]: increasing = False return increasing or decreasing if __name__ == "__main__": obj = Solution() print(obj.isMonotonic([1, 2, 2, 3])) # expect: True print(obj.isMonotonic([6, 5, 4, 4])) # expect: True print(obj.isMonotonic([1, 3, 2])) # expect: False