_386.java

package com.fishercoder.solutions;

import java.util.ArrayList;
import java.util.List;

public class _386 {
    public static class Solution1 {
        //Radix sort doesn't apply here! Don't confuse yourself!

        //rewrote their solution from Python to Java:https://discuss.leetcode.com/topic/54986/python-memory-limit-exceeded-for-problem-386/17
        public List<Integer> lexicalOrder(int n) {
            List<Integer> result = new ArrayList();
            int i = 1;
            while (true) {
                result.add(i);
                if (i * 10 <= n) {
                    i *= 10;
                } else {
                    while (i % 10 == 9 || i == n) {
                        i /= 10;
                    }
                    if (i == 0) {
                        return result;
                    }
                    i++;
                }
            }
        }
    }
}