Problem 2202. Flip the bit

Given an input character string (e.g. '1001'), return a character string with the bits flipped ('0110').

Solve

Last Solution submitted on Jan 23, 2026

David Young on 20 Feb 2014

The test suite does not check that the solution is a character string, but the problem definition requires that it should.

the cyclist on 20 Feb 2014

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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