Given an integer n, return all the numbers in the range [1, n] sorted in lexicographical order. Example 1: Input: n = 13 Output: [1,10,11,12,13,2,3,4,5,6,7,8,9] Example 2: Input: n = 2 Output: [1,2] Constraints: 1 <= n <= 5 * 104 Follow up: Could you optimize your solution to use O(n) runtime and O(1) space?