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add leetcode problem-cn part3

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算法题（国内版）/problem (Chinese)/交替位二进制数 [binary-number-with-alternating-bits].html Normal file
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<p>给定一个正整数，检查它的二进制表示是否总是 0、1 交替出现：换句话说，就是二进制表示中相邻两位的数字永不相同。</p>
<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>n = 5
<strong>输出：</strong>true
<strong>解释：</strong>5 的二进制表示是：101
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>n = 7
<strong>输出：</strong>false
<strong>解释：</strong>7 的二进制表示是：111.</pre>
<p><strong>示例 3：</strong></p>
<pre>
<strong>输入：</strong>n = 11
<strong>输出：</strong>false
<strong>解释：</strong>11 的二进制表示是：1011.</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 2<sup>31</sup> - 1</code></li>
</ul>