First Unique Character in a String · Coding Interview Practice

First Unique Character in a StringGiven a string, return the index of the first non-repeating character. If none exists, return -1.Constraints

1 <= s.length <= 10^5

s consists of only lowercase English letters

Examples

Input: s = "leetcode" Output: 0

Input: s = "loveleetcode" Output: 2

Input: s = "aabb" Output: -1

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