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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).

class Solution:    # @param n, an integer    # @return an integer    def reverseBits(self, n):        b = bin(n)[:1:-1]        return int(b+'0'*(32-len(b)),2)

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