Calculate the product of all the elements in an array.
Example 1:
Input:
5
1 2 3 4 5
Output:
120

Example 2:
Input:
10
5 5 5 5 5 5 5 5 5 5
Output:
9765625

Your Task:
You don't need to read input or print anything. Your task is to complete the function product() which takes the array Arr[] and its size N as inputs and returns the product of all elements.
Expected Time Complexity: O(N)
Expected Auxiliary Space: O(1)

Constraints:
1 ≤ N ≤ 10
1 ≤ A[i] ≤ 5

见题面

见题面