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.
\n
Example 1:
\n\n\nInput: a = 12, b = 5, n = 4\nOutput: 98\nExplanation: For x = 2, (a XOR x) = 14 and (b XOR x) = 7. Hence, (a XOR x) * (b XOR x) = 98. \nIt can be shown that 98 is the maximum value of (a XOR x) * (b XOR x) for all 0 <= x < 2n.\n\n\nExample 2:
\n\n\nInput: a = 6, b = 7 , n = 5\nOutput: 930\nExplanation: For x = 25, (a XOR x) = 31 and (b XOR x) = 30. Hence, (a XOR x) * (b XOR x) = 930.\nIt can be shown that 930 is the maximum value of (a XOR x) * (b XOR x) for all 0 <= x < 2n.\n\n
Example 3:
\n\n\nInput: a = 1, b = 6, n = 3\nOutput: 12\nExplanation: For x = 5, (a XOR x) = 4 and (b XOR x) = 3. Hence, (a XOR x) * (b XOR x) = 12.\nIt can be shown that 12 is the maximum value of (a XOR x) * (b XOR x) for all 0 <= x < 2n.\n\n\n
\n
Constraints:
\n\n0 <= a, b < 2500 <= n <= 50ith bit, if both a and b have the same value, we can always make x’s ith bit different from a and b, so a ^ x and b ^ x both have the ith bit set.",
"Otherwise, we can only set the ith bit of one of a ^ x or b ^ x. Depending on the previous bits of a ^ x or b ^ x, we should set the smaller value’s ith bit."
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