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			29 lines
		
	
	
		
			719 B
		
	
	
	
		
			HTML
		
	
	
	
	
	
<p>输入一个整数 <code>n</code> ,求1~n这n个整数的十进制表示中1出现的次数。</p>
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<p>例如,输入12,1~12这些整数中包含1 的数字有1、10、11和12,1一共出现了5次。</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 = 12
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<strong>输出:</strong>5
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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 = 13
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<strong>输出:</strong>6</pre>
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<p> </p>
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<p><strong>限制:</strong></p>
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<ul>
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	<li><code>1 <= n < 2^31</code></li>
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</ul>
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<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>
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