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https://github.com/TheAlgorithms/Python.git
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21c99d2ae2
* added is_contains_unique_chars() * added is_contains_unique_chars() * added stackoverflow reference
32 lines
876 B
Python
32 lines
876 B
Python
def is_contains_unique_chars(input_str: str) -> bool:
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"""
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Check if all characters in the string is unique or not.
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>>> is_contains_unique_chars("I_love.py")
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True
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>>> is_contains_unique_chars("I don't love Python")
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False
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Time complexity: O(n)
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Space compexity: O(1) 19320 bytes as we are having 144697 characters in unicode
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"""
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# Each bit will represent each unicode character
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# For example 65th bit representing 'A'
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# https://stackoverflow.com/a/12811293
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bitmap = 0
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for ch in input_str:
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ch_unicode = ord(ch)
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ch_bit_index_on = pow(2, ch_unicode)
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# If we already turned on bit for current character's unicode
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if bitmap >> ch_unicode & 1 == 1:
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return False
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bitmap |= ch_bit_index_on
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return True
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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