89.Gray Code

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

};

转载于:https://www.cnblogs.com/smallredness/p/10676108.html