LeetCode_Gray Code

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.

class Solution {
public:
    vector<int> grayCode(int n) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        
        
        vector<int> result ;
        
        for(int i = 0; i< pow(2,n);i++)
        {
            int temp = (i>>1)^i;
            result.push_back(temp);
        }
        
        return result ;
        
    }
};

reference: http://baike.baidu.cn/view/358724.htm

http://blog.csdn.net/beiyeqingteng/article/details/7044471

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