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[8/16] 387. First Unique Character in a String
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Easy
6436223Add to ListShareGiven a string s, find 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 <= 105sconsists of only lowercase English letters.
Accepted
1,206,113
Submissions
2,059,391
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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
