[leetcode]Gray Code @ Python
原题地址:https://oj.leetcode.com/problems/gray-code/
题意:
The gray code is a binary numeral system where two successive values differ in only one bit.
Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. A gray code sequence must begin with 0.
For example, given n = 2,
return [0,1,3,2]
. Its gray code sequence is:
00 - 0 01 - 1 11 - 3 10 - 2
Note:
For a given n, a gray code sequence
is not uniquely defined.
For example, [0,2,3,1]
is also a valid gray code
sequence according to the above definition.
For now, the judge is able to judge based on one instance of gray code sequence. Sorry about that.
解题思路:格雷码的生成,采用数学的方法。
代码:
class Solution: # @return a list of integers def grayCode(self, n): res=[] size=1<<n for i in range(size): res.append((i>>1)^i) return res
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