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) { // Start typing your C/C++ solution below // DO NOT write int main() function vector<int> result; for(int i = 0; i < 1<<n; i++){ result.push_back(i ^ (i>>1)); } return result; } };