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[8/16] 387. First Unique Character in a String

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Given a string sfind the first non-repeating character in it and return its index. If it does not exist, return -1.

 

Example 1:

Input: s = "leetcode"
Output: 0

Example 2:

Input: s = "loveleetcode"
Output: 2

Example 3:

Input: s = "aabb"
Output: -1

 

Constraints:

  • 1 <= s.length <= 105
  • s consists of only lowercase English letters.
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import collections
class Solution:
    def firstUniqChar(self, s: str) -> int:
        counter = collections.Counter(s)
        
        for i, char in enumerate(s):
            if counter[char] == 1:
                return i
        
        
        return -1
            
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