Problem 61117. First Unique Character

Created by Edward

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Given a character vector s, return the first character that appears exactly once in s.
If every character repeats at least once, return the empty char '' (1×0 char).

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Last Solution submitted on Dec 11, 2025

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Christian Schröder on 8 Dec 2025 at 18:31

In addition to the broken test suite, '' is 0×0, not 1×0 (so the problem description is wrong), and it's generally better to test whether an array is empty by using isempty() rather than by explicitly comparing to e.g. ''.

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Problem 61117. First Unique Character

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Problem 61117. First Unique Character

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