DIY: Monotonic Array
Solve the interview question "Monotonic Array" in this lesson.
We'll cover the following
Problem statement
An array is monotonic if it is either monotone increasing or monotone decreasing.
An array, arr,
is monotone increasing if arr[i] <= arr[i + 1]
for every element at each index i
. An array, arr
, is monotone decreasing if arr[i] >= arr[i + 1]
for every element at each index i
. Here, i
should be 0 <= i <= n-1
, where n
is the size of the list.
Return True
if and only if the given array, arr
, is monotonic.
Input
The input will be an array of integers. The following is an example input:
arr = [1, 2, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 9]
Output
The output will be a Boolean representing whether the array is monotonic or not. The following is an example output:
True
The array arr
is increasing.
Coding exercise
Implement the is_monotonic(arr)
function, where arr
is the array of integers. The function returns either True
or False
depending on whether the array is monotonic or not.
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