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leetcode-problemset/leetcode-cn/problem (Chinese)/1~n 整数中 1 出现的次数 [1nzheng-shu-zhong-1chu-xian-de-ci-shu-lcof].html
2022-03-29 12:43:11 +08:00

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<p>输入一个整数 <code>n</code> 求1n这n个整数的十进制表示中1出现的次数。</p>
<p>例如输入12112这些整数中包含1 的数字有1、10、11和121一共出现了5次。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>n = 12
<strong>输出:</strong>5
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>n = 13
<strong>输出:</strong>6</pre>
<p> </p>
<p><strong>限制:</strong></p>
<ul>
<li><code>1 <= n < 2^31</code></li>
</ul>
<p>注意:本题与主站 233 题相同:<a href="https://leetcode-cn.com/problems/number-of-digit-one/">https://leetcode-cn.com/problems/number-of-digit-one/</a></p>