Code Problem / Strings
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This problem asks you to find the first character in a string that is not repeated elsewhere in the string. For example, given the string "abcdab", the answer would be "c ".
About this solution: The candidate's solution is correct and demonstrates a level of completeness. The candidate's approach is also optimal, as it iterates through the string only once to create the dictionary and then iterates through the string again to find the first character that is not repeated.