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# 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
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