Input - nums = { 1,3,5,7,2,6,4,9} and k = 3

Given an interger array and a range k , output the minimum element within k continuous range
min{1,3,5} min =1
min{3,5,7} min =3
min{5,7,2} min = 2
.....

Output - {1,3,2,2,2,4}

This should be solve in O(n)