2939. Maximum Xor Product

Given three integers a, b, and n, return the maximum value of (a XOR x) * (b XOR x) where 0 <= x < 2n. Since the answer may be too large, return it modulo 109 + 7. Note that XOR is the bitwise XOR operation. Example 1: Input: a = 12, b = 5, n = 4 Output: 98 Explanation: For x = 2, (a XOR x) = 14 and (b XOR x) = 7. Hence, (a XOR x) * (b XOR x) = 98. It can be shown that 98 is the maximum valu