class Solution {
    public static List<List<String>> displayTable(List<List<String>> orders) {
        int table; String food;
        Map<Integer, TreeMap<String, Integer>> map = new TreeMap<>();
        Set<String> set = new TreeSet<>();
        for (List<String> order : orders) {
            table = Integer.parseInt(order.get(1));food = order.get(2);
            set.add(food);
            TreeMap<String, Integer> foodMap;
            if (map.get(table) == null) foodMap = new TreeMap<>();
            else foodMap = map.get(table);
            foodMap.put(food, foodMap.getOrDefault(food, 0) +1);
            map.put(table, foodMap);
        }