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prestigegodson/first_repeating_character.py

Created March 17, 2021 11:48
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first_repeating_character.py
def first_repeating_character(characters):
if not characters:
return None
characterSet = set()
for c in characters:
if c in characterSet:
return c
else:
characterSet.add(c)
return None
print(first_repeating_character('ABCCABZC'))
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