Easy
Quiz
#387 First Unique Character in a String
APPROACH
Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.
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What is the optimal approach for this problem?
#387 First Unique Character in a String
APPROACH
Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.
What is the optimal approach for this problem?