Class Solution

  • All Implemented Interfaces:

    
    public final class Solution
    
                        

    190 - Reverse Bits.

    Easy

    Reverse bits of a given 32 bits unsigned integer.

    Note:

    • 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's internal binary representation is the same, whether it is signed or unsigned.

    • In Java, the compiler represents the signed integers using 2's complement notation. Therefore, in Example 2 above, the input represents the signed integer -3 and the output represents the signed integer -1073741825.

    Example 1:

    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.

    Example 2:

    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.

    Constraints:

    • The input must be a binary string of length 32

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

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
    • Field Summary

      Fields 
      Modifier and Type Field Description
    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
    • Method Summary

      Modifier and Type Method Description
      final Integer reverseBits(Integer n)
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait