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<p>请你编写并返回一个&nbsp;<strong>计数器&nbsp;</strong>函数,它接收一个整型参数 n 。这个&nbsp;<strong>计数器&nbsp;</strong>函数最初返回 n每次调用它时返回前一个值加 1 的值 ( <code>n</code> ,&nbsp; <code>n + 1</code> ,&nbsp; <code>n + 2</code> ,等等)。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<b>输入:</b>
n = 10
["call","call","call"]
<b>输出:</b>[10,11,12]
<strong>解释:
</strong>counter() = 10 // 第一次调用 counter(),返回 n。
counter() = 11 // 返回上次调用的值加 1。
counter() = 12 // 返回上次调用的值加 1。
</pre>
<p><strong>示例 2</strong></p>
<pre>
<b>输入:</b>
n = -2
["call","call","call","call","call"]
<b>输出:</b>[-2,-1,0,1,2]
<b>解释:</b>counter() 最初返回 -2。然后在每个后续调用后增加 1。
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>-1000<sup>&nbsp;</sup>&lt;= n &lt;= 1000</code></li>
<li><code>最多对 counter() 进行 1000 次调用</code></li>
</ul>