Given two integer arrays A and B, return the maximum length of an subarray that appears in both arrays.
Example 1:
Input: A: [1,2,3,2,1] B: [3,2,1,4,7] Output: 3 Explanation: The repeated subarray with maximum length is [3, 2, 1].
Note:
<li>1 <= len(A), len(B) <= 1000</li>
<li>0 <= A[i], B[i] < 100</li>