public/subjects/java/piscine/WeddingComplex

WeddingComplex

Instructions

Create a file WeddingComplex.java.

Write a function createBestCouple that returns a map of name from the first map associated with a name from the second list.
Each map argument will be composed as follows :

• Key: The name of the member to marry
• Value: The ordered list of preference containing members (keys) from the other map.

To objective of this function is to determine the best couple possible.
The optimal solution occurs when, considering a particular member named Alice, if there exists a preferred partner Bob over the selected partner Charly, then Bob is happier with his chosen partner Daphnee compared to being with Alice.

With an example :

• First map :
• Naruto orders his preferences : Sakura > Hinata
• Sasuke orders his preferences : Sakura > Hinata
• Second map :
• Sakura orders her preferences : Sasuke > Naruto
• Hinata orders her preferences : Naruto > Sasuke

A correct solution for this example is :

• Sasuke <-> Sakura (they are both with their first preference)
• Naruto <-> Hinata (Naruto would prefere Sakura, but Sakura is happier with Sasuke, Hinata has her first choice)

All the test will be chosen to guarantee such a solution exists. More than one solution could exist.

In order to simplify, the list will always have the same size.

Expected Functions

import java.util.List;
import java.util.Map;

public class WeddingComplex {
    public static Map<String, String> createBestCouple(Map<String, List<String>> first, Map<String, List<String>> second) {
        // your code here
    }
}

Usage

Here is a possible ExerciseRunner.java to test your function :

import java.util.List;
import java.util.Map;

public class ExerciseRunner {

    public static void main(String[] args) {
        System.out.println(WeddingComplex.createBestCouple(
                Map.of("Naruto", List.of("Sakura", "Hinata"), "Sasuke", List.of("Sakura", "Hinata")),
                Map.of("Sakura", List.of("Sasuke", "Naruto"), "Hinata", List.of("Naruto", "Sasuke"))));
    }
}

and its output :

$ javac *.java -d build
$ java -cp build ExerciseRunner 
{Sasuke=Sakura, Naruto=Hinata}
$ 

Notions

Wedding Algorithm
Map