In mathematics, a Hadamard matrix, named after the French mathematician Jacques Hadamard, is a square matrix whose entries are either +1 or −1 and whose rows are mutually orthogonal.
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I don't think the asserts are correct. Should they be assert(check1 && check2 && ~illegal)?
I've corrected the assert() calls in the test suite, as per Chris's feedback.
@Aadhithya T V, kindly make a note of how assert() function calls are used.