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34 lines
683 B
HTML
34 lines
683 B
HTML
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<p>给定整数 <code>n</code> ，返回 <em>所有小于非负整数 <code>n</code> 的质数的数量</em> 。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>n = 10
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<strong>输出：</strong>4
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<strong>解释：</strong>小于 10 的质数一共有 4 个, 它们是 2, 3, 5, 7 。
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>n = 0
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<strong>输出：</strong>0
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre>
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<strong>输入：</strong>n = 1
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<strong>输出</strong>：0
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= n <= 5 * 10<sup>6</sup></code></li>
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</ul>
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