<p>实现 <a href="https://www.cplusplus.com/reference/valarray/pow/" target="_blank">pow(<em>x</em>, <em>n</em>)</a> ，即计算 x 的 n 次幂函数（即，x<sup><span style="font-size:10.8333px">n</span></sup>）。</p>

<p> </p>

<p><strong>示例 1：</strong></p>

<pre>
<strong>输入：</strong>x = 2.00000, n = 10
<strong>输出：</strong>1024.00000
</pre>

<p><strong>示例 2：</strong></p>

<pre>
<strong>输入：</strong>x = 2.10000, n = 3
<strong>输出：</strong>9.26100
</pre>

<p><strong>示例 3：</strong></p>

<pre>
<strong>输入：</strong>x = 2.00000, n = -2
<strong>输出：</strong>0.25000
<strong>解释：</strong>2<sup>-2</sup> = 1/2<sup>2</sup> = 1/4 = 0.25
</pre>

<p> </p>

<p><strong>提示：</strong></p>

<ul>
	<li><code>-100.0 < x < 100.0</code></li>
	<li><code>-2<sup>31</sup> <= n <= 2<sup>31</sup>-1</code></li>
	<li><code>-10<sup>4</sup> <= x<sup>n</sup> <= 10<sup>4</sup></code></li>
</ul>
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