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All leaked interview problems are collected from Internet.

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**).

**Follow up**:

If this function is called many times, how would you optimize it?

Related problem: Reverse Integer

**Credits:**

Special thanks to @ts for adding this problem and creating all test cases.

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