99. First Non-Repeating Character Index
EasyHash Map
Print the 0-based index of the first character that occurs exactly once, or -1.
Input format
A single line of lowercase letters.
Output format
The index, or -1.
Example 1
Input
leetcode
Output
0
Example 2
Input
loveleetcode
Output
2
Constraints
1 ≤ |s| ≤ 10⁵
Read input from standard input and print the answer to standard output. Your code is judged against 6 test cases, most of them hidden.
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