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            "title": "Circular Permutation in Binary Representation",
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            "content": "<p>Given 2 integers <code>n</code> and <code>start</code>. Your task is return <strong>any</strong> permutation <code>p</code>&nbsp;of <code>(0,1,2.....,2^n -1) </code>such that :</p>\r\n\r\n<ul>\r\n\t<li><code>p[0] = start</code></li>\r\n\t<li><code>p[i]</code> and <code>p[i+1]</code>&nbsp;differ by only one bit in their binary representation.</li>\r\n\t<li><code>p[0]</code> and <code>p[2^n -1]</code>&nbsp;must also differ by only one bit in their binary representation.</li>\r\n</ul>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> n = 2, start = 3\r\n<strong>Output:</strong> [3,2,0,1]\r\n<strong>Explanation:</strong> The binary representation of the permutation is (11,10,00,01). \r\nAll the adjacent element differ by one bit. Another valid permutation is [3,1,0,2]\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> n = 3, start = 2\r\n<strong>Output:</strong> [2,6,7,5,4,0,1,3]\r\n<strong>Explanation:</strong> The binary representation of the permutation is (010,110,111,101,100,000,001,011).\r\n</pre>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 &lt;= n &lt;= 16</code></li>\r\n\t<li><code>0 &lt;= start&nbsp;&lt;&nbsp;2 ^ n</code></li>\r\n</ul>",
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                    "lang": "C++",
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                    "code": "class Solution {\r\npublic:\r\n    vector<int> circularPermutation(int n, int start) {\r\n        \r\n    }\r\n};",
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                    "code": "class Solution {\r\n    public List<Integer> circularPermutation(int n, int start) {\r\n        \r\n    }\r\n}",
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                    "lang": "Python",
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                    "code": "class Solution(object):\r\n    def circularPermutation(self, n, start):\r\n        \"\"\"\r\n        :type n: int\r\n        :type start: int\r\n        :rtype: List[int]\r\n        \"\"\"",
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                    "code": "class Solution:\r\n    def circularPermutation(self, n: int, start: int) -> List[int]:",
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                    "lang": "C",
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                    "code": "/**\r\n * Note: The returned array must be malloced, assume caller calls free().\r\n */\r\nint* circularPermutation(int n, int start, int* returnSize){\r\n\r\n}",
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                    "code": "public class Solution {\r\n    public IList<int> CircularPermutation(int n, int start) {\r\n        \r\n    }\r\n}",
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                    "code": "/**\r\n * @param {number} n\r\n * @param {number} start\r\n * @return {number[]}\r\n */\r\nvar circularPermutation = function(n, start) {\r\n    \r\n};",
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                    "code": "# @param {Integer} n\r\n# @param {Integer} start\r\n# @return {Integer[]}\r\ndef circular_permutation(n, start)\r\n    \r\nend",
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                    "code": "class Solution {\r\n    func circularPermutation(_ n: Int, _ start: Int) -> [Int] {\r\n        \r\n    }\r\n}",
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                    "code": "func circularPermutation(n int, start int) []int {\r\n    \r\n}",
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                    "code": "object Solution {\r\n    def circularPermutation(n: Int, start: Int): List[Int] = {\r\n        \r\n    }\r\n}",
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                    "code": "class Solution {\r\n    fun circularPermutation(n: Int, start: Int): List<Int> {\r\n        \r\n    }\r\n}",
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                    "code": "impl Solution {\r\n    pub fn circular_permutation(n: i32, start: i32) -> Vec<i32> {\r\n        \r\n    }\r\n}",
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                "Use gray code to generate a n-bit sequence.",
                "Rotate the sequence such that its first element is start."
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