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

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            "title": "Number of 1 Bits",
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            "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?",
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                    "code": "class Solution(object):\n    def hammingWeight(self, n):\n        \"\"\"\n        :type n: int\n        :rtype: int\n        \"\"\"\n        ",
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