Payam, this is a good puzzle, but the code in the template and the test suite gives away the answer. I suggest removing the code from the template and checking the validity of the answer by applying the rules to rows, columns, and 3x3 squares.
Given an unsigned integer x, find the largest y by rearranging the bits in x
Determine the number of odd integers in a vector
04 - Scalar Equations 3
PIN code III
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