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"""

Reverse bits of a given 32 bits unsigned integer.

For example, given input 43261596

(represented in binary as 00000010100101000001111010011100),

return 964176192

(represented in binary as 00111001011110000010100101000000).

"""

def reverse_bits(n):

m = 0

i = 0

while i < 32:

m = (m << 1) + (n & 1)

n >>= 1

i += 1

return m