leetcode-problemset/leetcode-cn/originData/exchange-lcci.json

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        "question": {
            "questionId": "100182",
            "questionFrontendId": "面试题 05.07",
            "categoryTitle": "LCCI",
            "boundTopicId": 46356,
            "title": "Exchange LCCI",
            "titleSlug": "exchange-lcci",
            "content": "<p>Write a program to swap odd and even bits in an integer with as few instructions as possible (e.g., bit 0 and bit 1 are swapped, bit 2 and bit 3 are swapped, and so on).</p>\r\n\r\n<p><strong>Example1:</strong></p>\r\n\r\n<pre>\r\n<strong> Input</strong>: num = 2（0b10）\r\n<strong> Output</strong> 1 (0b01)\r\n</pre>\r\n\r\n<p><strong>Example2:</strong></p>\r\n\r\n<pre>\r\n<strong> Input</strong>: num = 3\r\n<strong> Output</strong>: 3\r\n</pre>\r\n\r\n<p><strong>Note:</strong></p>\r\n\r\n<ol>\r\n\t<li><code>0 &lt;= num &lt;=</code>&nbsp;2^30 - 1</li>\r\n\t<li>The result integer fits into 32-bit integer.</li>\r\n</ol>\r\n",
            "translatedTitle": "配对交换",
            "translatedContent": "<p>配对交换。编写程序，交换某个整数的奇数位和偶数位，尽量使用较少的指令（也就是说，位0与位1交换，位2与位3交换，以此类推）。</p>\n\n<p> <strong>示例1:</strong></p>\n\n<pre>\n<strong> 输入</strong>：num = 2（或者0b10）\n<strong> 输出</strong> 1 (或者 0b01)\n</pre>\n\n<p> <strong>示例2:</strong></p>\n\n<pre>\n<strong> 输入</strong>：num = 3\n<strong> 输出</strong>：3\n</pre>\n\n<p> <strong>提示:</strong></p>\n\n<ol>\n<li><code>num</code>的范围在[0, 2^30 - 1]之间，不会发生整数溢出。</li>\n</ol>\n",
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                    "name": "Bit Manipulation",
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            "hints": [
                "交换每一对意味着把偶数位移到左边，奇数位移到右边。你能把这个问题分成几个部分吗？",
                "你能创建一个代表偶数位的数字吗？那么你可以将偶数位移过一位吗？",
                "二进制的1010等价于十进制的10，也相当于十六进制的0xA。那么二进制的101010...在十六进制中是什么？也就是说，你要如何表示1在奇数位上的1和0交替序列？如果反过来呢（1在偶数位）？",
                "尝试用掩码0xaaaaaaaa和0x55555555提取偶数位和奇数位。然后尝试移动偶数位和奇数位来创建正确的数字。"
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