【44】89. Gray Code

89. Gray Code

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• Total Accepted: 80601
 
• Total Submissions: 203541
 
• Difficulty: Medium
 
• Contributors: Admin

 

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

class Solution {
public:
    vector<int> grayCode(int n) {
        vector<int> res;
        for(int i = 0; i < pow(2, n); i++){
            res.push_back((i >> 1) ^ i);
        }
        return res;
    }
};