Given a n-bits number x, what is the sum of x to the binary inverted version of x? (this might be more simple than you think :-) )
in example:
n = 8 x = 1 (00000001) n-bit binary inverted x = 254 (11111110) then y = 255
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Sum of diagonal of a square matrix
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MATCH THE STRINGS (2 CHAR) very easy
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