For a given string of characters, s, your task is to find the first non-repeating character and return its index. Return −1 if there’s no unique character in the given string.
Constraints:
1≤s.length ...
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Solution: First Unique Character in a String
Statement▼
For a given string of characters, s, your task is to find the first non-repeating character and return its index. Return −1 if there’s no unique character in the given string.