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add leetcode problem-cn part3

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<p>如果数组是单调递增或单调递减的,那么它是&nbsp;<strong>单调 </strong><em></em></p>
<p>如果对于所有 <code>i &lt;= j</code><code>nums[i] &lt;= nums[j]</code>,那么数组 <code>nums</code> 是单调递增的。 如果对于所有 <code>i &lt;= j</code><code>nums[i]&gt; = nums[j]</code>,那么数组 <code>nums</code>&nbsp;是单调递减的。</p>
<p>当给定的数组 <code>nums</code>&nbsp;是单调数组时返回 <code>true</code>,否则返回 <code>false</code></p>
<p>&nbsp;</p>
<ol>
</ol>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>nums = [1,2,2,3]
<strong>输出:</strong>true
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>nums = [6,5,4,4]
<strong>输出:</strong>true
</pre>
<p><strong>示例 3</strong></p>
<pre>
<strong>输入:</strong>nums = [1,3,2]
<strong>输出:</strong>false
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
<li><code>-10<sup>5</sup>&nbsp;&lt;= nums[i] &lt;= 10<sup>5</sup></code></li>
</ul>