I need some help. I am having a hard time find the recurrence when given an algorithm in c++. The algorithm is a Max search: Its where program, and the program goes through the array from first element to last, or last to first (depends on how you program it) to look for the largest value. In this case it says if you give the program n elements (1.......n), the program goes from (0....n-1) because array indexing starts from 0 until n-1. So say you have:

1 2 3 4 5 6, and you want the element at A[0], you get 1, say A[5] = 6, and so on. Here is the algorithm goes n-1 to 0, and where "A" is the array:

Algorithm recursiveMax(A,n)

Input: Array A storing n>= 1 integers

Output: The Maximum element in A

if n = 1 then //if there is only 1 element in array

return A[0]

else

return max{recursiveMax(A,n-1), A[n-1]}

The book says the recurrence is:

f(n) = 3 when n=1 and f(n-1) + 7 otherwise

Now I understand where the three is coming from, its when you have the best case where there is only 1 element in the array so if preforms 3 steps to the program. But how about the second part?