Given is an array $A$ of $2n$ numbers, where $n$ is a positive integer. Give an algorithm to create an array $prod$ of length $2n$ where $$prod[i] \, = \, A[i] \times A[i+1] \times \cdots \times A[i+n-1],$$ ($A[x]$ means $A[x \ \text{mod}\ 2n]$) in $O(n)$ time [b]withou[/b]t using division. Assume that all binary arithmetic operations are $O(1)$
To solve the problem of creating an array \( \text{prod} \) of length \( 2n \) where each element \( \text{prod}[i] \) is the product of \( n \) consecutive elements in the array \( A \), we can use the following steps:

1. **Define the Problem Clearly:**
   Given an array \( A \) of length \( 2n \), we need to create an array \( \text{prod} \) such that:
   \[
   \text{prod}[i] = A[i] \times A[(i+1) \mod 2n] \times \cdots \times A[(i+n-1) \mod 2n]
   \]
   for \( i = 0, 1, \ldots, 2n-1 \).

2. **Create Intermediate Arrays:**
   We will create four intermediate arrays \( A_1, A_2, B_1, \) and \( B_2 \) of length \( n \) each.

   - \( A_1 \) will store the products of the first \( n \) elements of \( A \) in reverse order:
     \[
     A_1 = [a_n a_{n-1} \cdots a_1, \, a_n a_{n-1} \cdots a_2, \, \ldots, \, a_n a_{n-1}, \, a_n]
     \]
   - \( A_2 \) will store the cumulative products starting from \( a_{n+1} \):
     \[
     A_2 = [1, \, a_{n+1}, \, a_{n+1} a_{n+2}, \, \cdots, \, a_{n+1} a_{n+2} \cdots a_{2n-1}]
     \]
   - \( B_1 \) will store the products of the last \( n \) elements of \( A \) in reverse order:
     \[
     B_1 = [a_{n+1} a_{n+2} \cdots a_{2n}, \, a_{n+2} a_{n+3} \cdots a_{2n}, \, \ldots, \, a_{2n-1} a_{2n}, \, a_{2n}]
     \]
   - \( B_2 \) will store the cumulative products starting from \( a_1 \):
     \[
     B_2 = [1, \, a_1, \, a_1 a_2, \, \cdots, \, a_1 a_2 \cdots a_{n-1}]
     \]

3. **Compute the Final Arrays \( A \) and \( B \):**
   - Define \( A \) as the element-wise product of \( A_1 \) and \( A_2 \):
     \[
     A = A_1 \times A_2
     \]
   - Define \( B \) as the element-wise product of \( B_1 \) and \( B_2 \):
     \[
     B = B_1 \times B_2
     \]

4. **Combine the Results:**
   - Finally, concatenate \( A \) and \( B \) to form the array \( \text{prod} \):
     \[
     \text{prod} = [A, B]
     \]

5. **Time Complexity:**
   - Creating each of the arrays \( A_1, A_2, B_1, \) and \( B_2 \) takes \( O(n) \) time.
   - Computing the element-wise products \( A \) and \( B \) also takes \( O(n) \) time.
   - Concatenating \( A \) and \( B \) takes \( O(n) \) time.
   - Therefore, the overall time complexity is \( O(n) \).

The final answer is \( \boxed{ \text{prod} = [A, B] } \).