Gray_Code.cpp

class Solution {
public:
    unsigned int binary2gray(unsigned int bi) {
        return (bi >> 1) ^ bi;
    }
    vector<int> grayCode(int n) {
        vector<int> res;
        for (unsigned int i = 0; i < pow(2, n); i++) {
            res.push_back(binary2gray(i));
        }
        return res;
    }
};