Given 2 integers n and start. Your task is return any permutation p of (0,1,2.....,2^n -1) such that :
p[0] = startp[i] and p[i+1] differ by only one bit in their binary representation.p[0] and p[2^n -1] must also differ by only one bit in their binary representation.\r\n
Example 1:
\r\n\r\n\r\nInput: n = 2, start = 3\r\nOutput: [3,2,0,1]\r\nExplanation: 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\r\n\r\n
Example 2:
\r\n\r\n\r\nInput: n = 3, start = 2\r\nOutput: [2,6,7,5,4,0,1,3]\r\nExplanation: The binary representation of the permutation is (010,110,111,101,100,000,001,011).\r\n\r\n\r\n
\r\n
Constraints:
\r\n\r\n1 <= n <= 160 <= start < 2 ^ n给你两个整数 n 和 start。你的任务是返回任意 (0,1,2,,...,2^n-1) 的排列 p，并且满足：
p[0] = startp[i] 和 p[i+1] 的二进制表示形式只有一位不同p[0] 和 p[2^n -1] 的二进制表示形式也只有一位不同\n\n
示例 1：
\n\n\n输入：n = 2, start = 3\n输出：[3,2,0,1]\n解释：这个排列的二进制表示是 (11,10,00,01)\n 所有的相邻元素都有一位是不同的，另一个有效的排列是 [3,1,0,2]\n\n\n
示例 2：
\n\n\n输入：n = 3, start = 2\n输出：[2,6,7,5,4,0,1,3]\n解释：这个排列的二进制表示是 (010,110,111,101,100,000,001,011)\n\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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