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            "questionId": "191",
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            "categoryTitle": "Algorithms",
            "boundTopicId": 1126,
            "title": "Number of 1 Bits",
            "titleSlug": "number-of-1-bits",
            "content": "<p>Write a function that takes an unsigned integer and returns the number of &#39;1&#39; bits it has (also known as the <a href=\"http://en.wikipedia.org/wiki/Hamming_weight\" target=\"_blank\">Hamming weight</a>).</p>\n\n<p><strong>Note:</strong></p>\n\n<ul>\n\t<li>Note that in some languages, such as Java, there is no unsigned integer type. In this case, the input will be given as a signed integer type. It should not affect your implementation, as the integer&#39;s internal binary representation is the same, whether it is signed or unsigned.</li>\n\t<li>In Java, the compiler represents the signed integers using <a href=\"https://en.wikipedia.org/wiki/Two%27s_complement\" target=\"_blank\">2&#39;s complement notation</a>. Therefore, in <strong>Example 3</strong>, the input represents the signed integer. <code>-3</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 00000000000000000000000000001011\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The input binary string <strong>00000000000000000000000000001011</strong> has a total of three &#39;1&#39; bits.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 00000000000000000000000010000000\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The input binary string <strong>00000000000000000000000010000000</strong> has a total of one &#39;1&#39; bit.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 11111111111111111111111111111101\n<strong>Output:</strong> 31\n<strong>Explanation:</strong> The input binary string <strong>11111111111111111111111111111101</strong> has a total of thirty one &#39;1&#39; bits.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The input must be a <strong>binary string</strong> of length <code>32</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<strong>Follow up:</strong> If this function is called many times, how would you optimize it?",
            "translatedTitle": "位1的个数",
            "translatedContent": "<p>编写一个函数，输入是一个无符号整数（以二进制串的形式），返回其二进制表达式中数字位数为 '1' 的个数（也被称为<a href=\"https://baike.baidu.com/item/%E6%B1%89%E6%98%8E%E9%87%8D%E9%87%8F\" target=\"_blank\">汉明重量</a>）。</p>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>请注意，在某些语言（如 Java）中，没有无符号整数类型。在这种情况下，输入和输出都将被指定为有符号整数类型，并且不应影响您的实现，因为无论整数是有符号的还是无符号的，其内部的二进制表示形式都是相同的。</li>\n\t<li>在 Java 中，编译器使用<a href=\"https://baike.baidu.com/item/二进制补码/5295284\" target=\"_blank\">二进制补码</a>记法来表示有符号整数。因此，在上面的 <strong>示例 3</strong> 中，输入表示有符号整数 <code>-3</code>。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>00000000000000000000000000001011\n<strong>输出：</strong>3\n<strong>解释：</strong>输入的二进制串 <code><strong>00000000000000000000000000001011</strong> 中，共有三位为 '1'。</code>\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>00000000000000000000000010000000\n<strong>输出：</strong>1\n<strong>解释：</strong>输入的二进制串 <strong>00000000000000000000000010000000</strong> 中，共有一位为 '1'。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>11111111111111111111111111111101\n<strong>输出：</strong>31\n<strong>解释：</strong>输入的二进制串 <strong>11111111111111111111111111111101</strong> 中，共有 31 位为 '1'。</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>输入必须是长度为 <code>32</code> 的 <strong>二进制串</strong> 。</li>\n</ul>\n\n<ul>\n</ul>\n\n<p> </p>\n\n<p><strong>进阶</strong>：</p>\n\n<ul>\n\t<li>如果多次调用这个函数，你将如何优化你的算法？</li>\n</ul>\n",
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