reverse-bits

Reverse Bits

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reverseBits

Reverse bits of a given 32 bits unsigned integer.

Note:

<ul>
	<li>Note that in some languages, such as Java, there is no unsigned integer type. In this case, both input and output will be given as a signed integer type. They should not affect your implementation, as the integer&#39;s internal binary representation is the same, whether it is signed or unsigned.</li>
	<li>In Java, the compiler represents the signed integers using <a href="https://en.wikipedia.org/wiki/Two%27s_complement" target="_blank">2&#39;s complement notation</a>. Therefore, in Example 2 above, the input represents the signed integer <code>-3</code> and the output represents the signed integer <code>-1073741825</code>.</li>
</ul>

&nbsp;
Example 1:

<pre>
Input: n = 00000010100101000001111010011100
Output: 964176192 (00111001011110000010100101000000)
Explanation: The input binary string 00000010100101000001111010011100 represents the unsigned integer 43261596, so return 964176192 which its binary representation is 00111001011110000010100101000000.
</pre>

Example 2:

<pre>
Input: n = 11111111111111111111111111111101
Output: 3221225471 (10111111111111111111111111111111)
Explanation: The input binary string 11111111111111111111111111111101 represents the unsigned integer 4294967293, so return 3221225471 which its binary representation is 10111111111111111111111111111111.
</pre>

&nbsp;
Constraints:

<ul>
	<li>The input must be a binary string of length <code>32</code></li>
</ul>

&nbsp;
Follow up: If this function is called many times, how would you optimize it?

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