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leetcode-cn/problem (English)/配对交换(English) [exchange-lcci].html
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<p>Write a program to swap odd and even bits in an integer with as few instructions as possible (e.g., bit 0 and bit 1 are swapped, bit 2 and bit 3 are swapped, and so on).</p>
<p><strong>Example1:</strong></p>
<pre>
<strong> Input</strong>: num = 2（0b10）
<strong> Output</strong> 1 (0b01)
</pre>
<p><strong>Example2:</strong></p>
<pre>
<strong> Input</strong>: num = 3
<strong> Output</strong>: 3
</pre>
<p><strong>Note:</strong></p>
<ol>
<li><code>0 &lt;= num &lt;=</code>&nbsp;2^30 - 1</li>
<li>The result integer fits into 32-bit integer.</li>
</ol>
<p>Write a program to swap odd and even bits in an integer with as few instructions as possible (e.g., bit 0 and bit 1 are swapped, bit 2 and bit 3 are swapped, and so on).</p>
<p><strong>Example1:</strong></p>
<pre>
<strong> Input</strong>: num = 2（0b10）
<strong> Output</strong> 1 (0b01)
</pre>
<p><strong>Example2:</strong></p>