bitwise_and_num_range.py (677B)
| # 201. Bitwise AND of Numbers Range
import math
"""
given two integers 'm' and 'n' that represent the range '[m,
n]', return the bitwise and of all numbers in this range, inclusive.
"""
class Solution(object):
def rangeBitwiseAnd(self, m, n):
"""
:type m: int
:type n: int
:rtype: int
"""
if m == n:
return m
diff = n - m
msb = 1 << math.floor(math.log2(diff))
bit_rem = (msb << 1) - 1
return m & m & ~bit_rem
if __name__ == "__main__":
obj = Solution()
print(obj.rangeBitwiseAnd(5, 7))
print(obj.rangeBitwiseAnd(0, 0))
print(obj.rangeBitwiseAnd(1, 82747883))
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