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- class Solution {
- public List<Integer> grayCode(int n) {
- List<Integer> res = new ArrayList<>();
- res.add(0);
- if (n > 0) {
- int adder = 1;
- for (int i = 1; i <= n; i++) {
- int len = res.size();
- for (int j = len - 1; j >= 0; j--) {
- res.add(res.get(j) + adder);
- }
- adder *= 2;
- }
- }
- return res;
- }
- }
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