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26 lines
496 B
HTML
26 lines
496 B
HTML
<p>给定一个整数 <code>n</code>，计算所有小于等于 <code>n</code> 的非负整数中数字 <code>1</code> 出现的个数。</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 = 13
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<strong>输出：</strong>6
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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> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= n <= 10<sup>9</sup></code></li>
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</ul>
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