first_unique_character_in_a_string

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387. First Unique Character in a String (Easy)

Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1.

Examples:

s = "leetcode"
return 0.
s = "loveleetcode",
return 2.

Note: You may assume the string contain only lowercase letters.

Related Topics

[Hash Table] [String]

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