First Non-Repeated Character

EasyPython

Problem

Given a string s, return the first character that appears exactly once in the string. If no such character exists, return an empty string "". The algorithm should preserve the original order of characters when deciding which unique character is first.

Constraints

0 <= len(s) <= 10^5
s contains printable ASCII characters
Return the character itself, not its index

Function Signature

def first_non_repeated_char(s):

CodePython 3

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