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leetcode-problemset/leetcode-cn/problem (Chinese)/计数质数 [count-primes].html
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<p>给定整数 <code>n</code> ,返回 <em>所有小于非负整数&nbsp;<code>n</code>&nbsp;的质数的数量</em></p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>n = 10
<strong>输出:</strong>4
<strong>解释:</strong>小于 10 的质数一共有 4 个, 它们是 2, 3, 5, 7 。
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>n = 0
<strong>输出:</strong>0
</pre>
<p><strong>示例 3</strong></p>
<pre>
<strong>输入:</strong>n = 1
<strong>输出</strong>0
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>0 &lt;= n &lt;= 5 * 10<sup>6</sup></code></li>
</ul>