12 lines
260 B
Python
12 lines
260 B
Python
def has_dup(xs):
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seen = set()
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for x in xs:
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if x in seen:
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return True
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seen.add(x)
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return False
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if __name__ == "__main__":
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assert has_dup([1,2,3,1]) == True
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assert has_dup([1,2,3]) == False
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print("tests pass") |