rotate array

rotate_array.txt

Given an array, rotate the array to the right by k steps, where k is non-negative.

example, we're give an array [1,2,3,4,5,6,7] and we want to rotate it by 3 times

nums = [1,2,3,4,5,6,7]
k = 3

we're going to modulo the k element, just incase the k element is more than the length of our array.

k = k % len(array)

we're going to solve this using using "O(1)" time complexity.

we're going to rotate the array, that means we've have two portion, the one that will be moved to right: [1234], and another portion 
that we'll move to left: [567] because it's the last K element.

first, we'll reverse the entire array, our result will be
[7, 6, 5, 4, 3, 2, 1]

the above array is not our expected result, so, we'll reverse the k element which is [7,6,5] 
and also reverse the other part [3,2,1] to be able to get our expected result.