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Task/Stable-marriage-problem/Java/stable-marriage-problem.java
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Task/Stable-marriage-problem/Java/stable-marriage-problem.java
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import java.util.*;
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public class Stable {
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static List<String> guys = Arrays.asList(
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new String[]{
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"abe", "bob", "col", "dan", "ed", "fred", "gav", "hal", "ian", "jon"});
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static List<String> girls = Arrays.asList(
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new String[]{
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"abi", "bea", "cath", "dee", "eve", "fay", "gay", "hope", "ivy", "jan"});
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static Map<String, List<String>> guyPrefers =
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new HashMap<String, List<String>>(){{
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put("abe",
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Arrays.asList("abi", "eve", "cath", "ivy", "jan", "dee", "fay",
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"bea", "hope", "gay"));
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put("bob",
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Arrays.asList("cath", "hope", "abi", "dee", "eve", "fay", "bea",
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"jan", "ivy", "gay"));
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put("col",
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Arrays.asList("hope", "eve", "abi", "dee", "bea", "fay", "ivy",
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"gay", "cath", "jan"));
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put("dan",
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Arrays.asList("ivy", "fay", "dee", "gay", "hope", "eve", "jan",
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"bea", "cath", "abi"));
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put("ed",
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Arrays.asList("jan", "dee", "bea", "cath", "fay", "eve", "abi",
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"ivy", "hope", "gay"));
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put("fred",
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Arrays.asList("bea", "abi", "dee", "gay", "eve", "ivy", "cath",
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"jan", "hope", "fay"));
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put("gav",
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Arrays.asList("gay", "eve", "ivy", "bea", "cath", "abi", "dee",
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"hope", "jan", "fay"));
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put("hal",
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Arrays.asList("abi", "eve", "hope", "fay", "ivy", "cath", "jan",
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"bea", "gay", "dee"));
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put("ian",
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Arrays.asList("hope", "cath", "dee", "gay", "bea", "abi", "fay",
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"ivy", "jan", "eve"));
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put("jon",
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Arrays.asList("abi", "fay", "jan", "gay", "eve", "bea", "dee",
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"cath", "ivy", "hope"));
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}};
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static Map<String, List<String>> girlPrefers =
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new HashMap<String, List<String>>(){{
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put("abi",
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Arrays.asList("bob", "fred", "jon", "gav", "ian", "abe", "dan",
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"ed", "col", "hal"));
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put("bea",
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Arrays.asList("bob", "abe", "col", "fred", "gav", "dan", "ian",
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"ed", "jon", "hal"));
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put("cath",
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Arrays.asList("fred", "bob", "ed", "gav", "hal", "col", "ian",
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"abe", "dan", "jon"));
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put("dee",
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Arrays.asList("fred", "jon", "col", "abe", "ian", "hal", "gav",
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"dan", "bob", "ed"));
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put("eve",
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Arrays.asList("jon", "hal", "fred", "dan", "abe", "gav", "col",
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"ed", "ian", "bob"));
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put("fay",
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Arrays.asList("bob", "abe", "ed", "ian", "jon", "dan", "fred",
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"gav", "col", "hal"));
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put("gay",
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Arrays.asList("jon", "gav", "hal", "fred", "bob", "abe", "col",
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"ed", "dan", "ian"));
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put("hope",
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Arrays.asList("gav", "jon", "bob", "abe", "ian", "dan", "hal",
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"ed", "col", "fred"));
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put("ivy",
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Arrays.asList("ian", "col", "hal", "gav", "fred", "bob", "abe",
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"ed", "jon", "dan"));
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put("jan",
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Arrays.asList("ed", "hal", "gav", "abe", "bob", "jon", "col",
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"ian", "fred", "dan"));
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}};
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public static void main(String[] args){
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Map<String, String> matches = match(guys, guyPrefers, girlPrefers);
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for(Map.Entry<String, String> couple:matches.entrySet()){
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System.out.println(
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couple.getKey() + " is engaged to " + couple.getValue());
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}
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if(checkMatches(guys, girls, matches, guyPrefers, girlPrefers)){
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System.out.println("Marriages are stable");
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}else{
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System.out.println("Marriages are unstable");
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}
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String tmp = matches.get(girls.get(0));
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matches.put(girls.get(0), matches.get(girls.get(1)));
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matches.put(girls.get(1), tmp);
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System.out.println(
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girls.get(0) +" and " + girls.get(1) + " have switched partners");
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if(checkMatches(guys, girls, matches, guyPrefers, girlPrefers)){
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System.out.println("Marriages are stable");
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}else{
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System.out.println("Marriages are unstable");
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}
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}
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private static Map<String, String> match(List<String> guys,
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Map<String, List<String>> guyPrefers,
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Map<String, List<String>> girlPrefers){
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Map<String, String> engagedTo = new TreeMap<String, String>();
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List<String> freeGuys = new LinkedList<String>();
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freeGuys.addAll(guys);
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while(!freeGuys.isEmpty()){
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String thisGuy = freeGuys.remove(0); //get a load of THIS guy
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List<String> thisGuyPrefers = guyPrefers.get(thisGuy);
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for(String girl:thisGuyPrefers){
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if(engagedTo.get(girl) == null){//girl is free
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engagedTo.put(girl, thisGuy); //awww
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break;
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}else{
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String otherGuy = engagedTo.get(girl);
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List<String> thisGirlPrefers = girlPrefers.get(girl);
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if(thisGirlPrefers.indexOf(thisGuy) <
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thisGirlPrefers.indexOf(otherGuy)){
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//this girl prefers this guy to the guy she's engaged to
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engagedTo.put(girl, thisGuy);
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freeGuys.add(otherGuy);
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break;
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}//else no change...keep looking for this guy
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}
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}
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}
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return engagedTo;
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}
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private static boolean checkMatches(List<String> guys, List<String> girls,
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Map<String, String> matches, Map<String, List<String>> guyPrefers,
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Map<String, List<String>> girlPrefers) {
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if(!matches.keySet().containsAll(girls)){
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return false;
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}
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if(!matches.values().containsAll(guys)){
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return false;
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}
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Map<String, String> invertedMatches = new TreeMap<String, String>();
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for(Map.Entry<String, String> couple:matches.entrySet()){
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invertedMatches.put(couple.getValue(), couple.getKey());
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}
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for(Map.Entry<String, String> couple:matches.entrySet()){
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List<String> shePrefers = girlPrefers.get(couple.getKey());
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List<String> sheLikesBetter = new LinkedList<String>();
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sheLikesBetter.addAll(shePrefers.subList(0, shePrefers.indexOf(couple.getValue())));
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List<String> hePrefers = guyPrefers.get(couple.getValue());
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List<String> heLikesBetter = new LinkedList<String>();
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heLikesBetter.addAll(hePrefers.subList(0, hePrefers.indexOf(couple.getKey())));
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for(String guy : sheLikesBetter){
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String guysFinace = invertedMatches.get(guy);
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List<String> thisGuyPrefers = guyPrefers.get(guy);
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if(thisGuyPrefers.indexOf(guysFinace) >
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thisGuyPrefers.indexOf(couple.getKey())){
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System.out.printf("%s likes %s better than %s and %s"
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+ " likes %s better than their current partner\n",
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couple.getKey(), guy, couple.getValue(),
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guy, couple.getKey());
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return false;
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}
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}
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for(String girl : heLikesBetter){
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String girlsFinace = matches.get(girl);
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List<String> thisGirlPrefers = girlPrefers.get(girl);
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if(thisGirlPrefers.indexOf(girlsFinace) >
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thisGirlPrefers.indexOf(couple.getValue())){
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System.out.printf("%s likes %s better than %s and %s"
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+ " likes %s better than their current partner\n",
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couple.getValue(), girl, couple.getKey(),
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girl, couple.getValue());
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return false;
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}
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}
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}
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return true;
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}
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}
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