1835 - Find XOR Sum of All Pairs Bitwise AND\.

Hard

The XOR sum of a list is the bitwise XOR of all its elements. If the list only contains one element, then its XOR sum will be equal to this element.

• For example, the XOR sum of [1,2,3,4] is equal to 1 XOR 2 XOR 3 XOR 4 = 4, and the XOR sum of [3] is equal to 3.

You are given two 0-indexed arrays arr1 and arr2 that consist only of non-negative integers.

Consider the list containing the result of arr1[i] AND arr2[j] (bitwise AND) for every (i, j) pair where 0 <= i < arr1.length and 0 <= j < arr2.length.

Return the XOR sum of the aforementioned list.

Example 1:

Input: arr1 = 1,2,3, arr2 = 6,5

Output: 0

Explanation: The list = 1 AND 6, 1 AND 5, 2 AND 6, 2 AND 5, 3 AND 6, 3 AND 5 = 0,1,2,0,2,1. The XOR sum = 0 XOR 1 XOR 2 XOR 0 XOR 2 XOR 1 = 0.

Example 2:

Input: arr1 = 12, arr2 = 4

Output: 4

Explanation: The list = 12 AND 4 = 4. The XOR sum = 4.

Constraints:

• <code>1 <= arr1.length, arr2.length <= 10⁵</code>

• <code>0 <= arr1i, arr2j<= 10⁹</code>