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add leetcode problem-cn part3

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算法题（国内版）/problem (English)/交替位二进制数(English) [binary-number-with-alternating-bits].html Normal file
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<p>Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong> n = 5
<strong>Output:</strong> true
<strong>Explanation:</strong> The binary representation of 5 is: 101
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong> n = 7
<strong>Output:</strong> false
<strong>Explanation:</strong> The binary representation of 7 is: 111.</pre>
<p><strong>Example 3:</strong></p>
<pre>
<strong>Input:</strong> n = 11
<strong>Output:</strong> false
<strong>Explanation:</strong> The binary representation of 11 is: 1011.</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 2<sup>31</sup> - 1</code></li>
</ul>