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Write a function that takes in an array of integers and returns a boolean representing whether the array is monotonic.

An array is said to be monotonic if its elements, left to right , are entirely non-increasing or entirely non-decreasing.

Non-increasing elements aren't neccessarily exclusively decreasing; they simply don't increase. Similarly, non-decreasing elements aren't exclusively increasing; they simply don't decrease.

Note that empty arrays and arrays of one element are monotonic.

Input:

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Google Summer of Code 2022 Final Report

Organization: JBoss

Mentors:

• Max Rydahl Andersen
• Lukas Krejci