package comp1110.exam;
import java.util.List;
import java.util.Set;
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* COMP1110 Final Exam, Question 1iii
public class Q1MealPlan {
* Each food is assigned to one of four groups.
public enum Meal {
BREAKFAST, LUNCH, DINNER, DESSERT
public static class Food {
String dish;
Meal meal;
public Food(String dish, Meal meal) {
this.dish = dish;
this.meal = meal;
public String toString() {
return dish + ” (” + meal.name().toLowerCase() + “)”;
* Get all meal plans that can be composed from the provided
* set of foods for the given number of meals.
* A meal plan is a sequence of foods that are eaten sequentially.
* One food is eaten per meal, and any food may only be eaten at most once.
* Foods must be eaten in order of their Meal type according to the following rules:
* – a BREAKFAST may only be followed by a LUNCH food;
* – a LUNCH may only be followed by a DINNER food;
* – an DINNER may only be followed by a DESSERT food; and
* – a DESSERT may only be followed by a BREAKFAST food.
* For example, the call
* getAllMealPlans([Cake (dessert), Risotto (dinner)], 2)
* returns a set containing a single plan:
* – [Risotto (dinner), Cake (dessert)]
* because a DINNER meal may only be followed by a DESSERT meal.
* The call
* getAllMealPlans([Cake (dessert), Vegetable Soup (lunch), Waffles (breakfast), Potato Gratin (dinner)], 4)
* returns a set containing four plans:
* – [ Waffles (breakfast), Vegetable Soup (lunch), Potato Gratin (dinner), Cake (dessert)]
* – [Vegetable Soup (lunch), Potato Gratin (dinner), Cake (dessert), Waffles (breakfast)]
* – [Potato Gratin (dinner), Cake (dessert), Waffles (breakfast), Vegetable Soup (lunch)]
* – [Cake (dessert), Waffles (breakfast), Vegetable Soup (lunch), Potato Gratin (dinner)]
* If no valid meal plan can be found, an empty list is returned.
* For example, the call:
* getAllMealPlans([ (dessert), Sushi (lunch)], 2)
* returns an empty set, because a DESSERT food cannot be followed by
* a LUNCH food, and a LUNCH food cannot be followed by a DESSERT food.
* @param foods the set of foods from which to construct a meal plan
* @param numMeals the number of meals
* @return the set of all possible meal plans of the provided foods for the
* given number of meals
public static Set
// FIXME complete this method
return null;
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