https://web.stanford.edu/class/archive/cs/cs107/cs107.1174/assign4/#2-sudoku-sets
2. Sudoku sets
Treating an unsigned type as a bit vector can compactlyrepresent and efficiently manipulate a set over a given range. Bitvectors are used in time and space-constrained situations toprovide dense storage and allow fast manipulation of the entiregroup of bits at once. In a bit vector, each individual bit isdesignated to represent a particular value and a bit is turned onto indicate its corresponding value is contained in the set. Inthis problem, we have sets drawn from the range [1-9]. A set isrepresented using an unsigned short (16 bits). The bit at thenth position (counting from least significant bit
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