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14 def first_non_repeated_character(s): 15 """O(2n) == O(n)""" 16 char_count_map = collections.defaultdict(lambda: 0) 17 for ch in s: # O(n) 18 char_count_map[ch] += 1 19 for ch in s: # O(n) 20 if char_count_map[ch] == 1: 21 return ch 22 return None