Package g0101_0200.s0190_reverse_bits

Class Solution

java.lang.Object
g0101_0200.s0190_reverse_bits.Solution
public class Solution extends Object
190 - Reverse Bits.<p>Easy</p> <p>Reverse bits of a given 32 bits unsigned integer.</p> <p><strong>Note:</strong></p> <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&rsquo;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="_top">2&rsquo;s complement notation</a>. Therefore, in <strong>Example 2</strong> above, the input represents the signed integer <code>-3</code> and the output represents the signed integer <code>-1073741825</code>.</li> </ul> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> n = 00000010100101000001111010011100</p> <p><strong>Output:</strong> 964176192 (00111001011110000010100101000000)</p> <p><strong>Explanation:</strong> The input binary string <strong>00000010100101000001111010011100</strong> represents the unsigned integer 43261596, so return 964176192 which its binary representation is <strong>00111001011110000010100101000000</strong>.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> n = 11111111111111111111111111111101</p> <p><strong>Output:</strong> 3221225471 (10111111111111111111111111111111)</p> <p><strong>Explanation:</strong> The input binary string <strong>11111111111111111111111111111101</strong> represents the unsigned integer 4294967293, so return 3221225471 which its binary representation is <strong>10111111111111111111111111111111</strong>.</p> <p><strong>Constraints:</strong></p> <ul> <li>The input must be a <strong>binary string</strong> of length <code>32</code></li> </ul> <p><strong>Follow up:</strong> If this function is called many times, how would you optimize it?</p>

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • reverseBits

      public int reverseBits(int n)