# Monotonic array

## Question

Can you check if a given array containing `n`

integers is monotonic? Your function should return `"true"`

if it is monotonic and `"false"`

if it's not.

An array is monotonic if it is either monotone increasing or monotone decreasing. An array `A`

is monotone increasing if for all `i <= j, A[i] <= A[j]`

. An array `A`

is monotone decreasing if for all `i <= j, A[i] >= A[j]`

.

For example:

```
Input : [6, 5, 4, 4]
Output : true
Input : [5, 5, 5, 4]
Output : true
Input : [5, 15, 20, 10]
Output : false
```