Problem 2202. Flip the bit
Given an input character string (e.g. '1001'), return a character string with the bits flipped ('0110').
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2 Comments
The test suite does not check that the solution is a character string, but the problem definition requires that it should.
Added this check. (I messed it up a bit the first time I tried to do it, so sorry for some interim weirdness.)
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