16 lines
458 B
Python
16 lines
458 B
Python
def monotonic(l: list):
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"""Return True is list elements are monotonically increasing or decreasing.
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>>> monotonic([1, 2, 4, 20])
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True
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>>> monotonic([1, 20, 4, 10])
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False
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>>> monotonic([4, 1, 0, -10])
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True
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"""
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if len(l) <= 2:
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return True
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increasing = all(l[i] <= l[i + 1] for i in range(len(l) - 1))
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decreasing = all(l[i] >= l[i + 1] for i in range(len(l) - 1))
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return increasing or decreasing |