leetcode-problemset/leetcode-cn/originData/number-of-1-bits.json

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            "questionId": "191",
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            "categoryTitle": "Algorithms",
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            "title": "Number of 1 Bits",
            "titleSlug": "number-of-1-bits",
            "content": "<p>Given a positive integer <code>n</code>, write a function that returns the number of <span data-keyword=\"set-bit\">set bits</span> in its binary representation (also known as the <a href=\"http://en.wikipedia.org/wiki/Hamming_weight\" target=\"_blank\">Hamming weight</a>).</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 11</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The input binary string <strong>1011</strong> has a total of three set bits.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 128</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The input binary string <strong>10000000</strong> has a total of one set bit.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 2147483645</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">30</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The input binary string <strong>1111111111111111111111111111101</strong> has a total of thirty set bits.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 2<sup>31</sup> - 1</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>给定一个正整数 <code>n</code>，编写一个函数，获取一个正整数的二进制形式并返回其二进制表达式中 <span data-keyword=\"set-bit\">设置位</span> 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>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 11\n<strong>输出：</strong>3\n<strong>解释：</strong>输入的二进制串 <code><strong>1011</strong>&nbsp;中，共有 3 个设置位。</code>\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 128\n<strong>输出：</strong>1\n<strong>解释：</strong>输入的二进制串 <strong>10000000</strong>&nbsp;中，共有 1 个设置位。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 2147483645\n<strong>输出：</strong>30\n<strong>解释：</strong>输入的二进制串 <strong>1111111111111111111111111111101</strong> 中，共有 30 个设置位。</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 2<sup>31</sup> - 1</code></li>\n</ul>\n\n<ul>\n</ul>\n\n<p>&nbsp;</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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