#638Easy#24 in EPAM Systems's list· asked at 14 companies
First Unique Character in a String
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What we know
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 <= 10^5 - •
sconsists of only lowercase English letters.