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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Stable-marriage-problem/C-sharp/stable-marriage-problem.cs Normal file
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using System;
using System.Collections.Generic;
namespace StableMarriage
{
class Person
{
private int _candidateIndex;
public string Name { get; set; }
public List<Person> Prefs { get; set; }
public Person Fiance { get; set; }
public Person(string name) {
Name = name;
Prefs = null;
Fiance = null;
_candidateIndex = 0;
}
public bool Prefers(Person p) {
return Prefs.FindIndex(o => o == p) < Prefs.FindIndex(o => o == Fiance);
}
public Person NextCandidateNotYetProposedTo() {
if (_candidateIndex >= Prefs.Count) return null;
return Prefs[_candidateIndex++];
}
public void EngageTo(Person p) {
if (p.Fiance != null) p.Fiance.Fiance = null;
p.Fiance = this;
if (Fiance != null) Fiance.Fiance = null;
Fiance = p;
}
}
static class MainClass
{
static public bool IsStable(List<Person> men) {
List<Person> women = men[0].Prefs;
foreach (Person guy in men) {
foreach (Person gal in women) {
if (guy.Prefers(gal) && gal.Prefers(guy))
return false;
}
}
return true;
}
static void DoMarriage() {
Person abe = new Person("abe");
Person bob = new Person("bob");
Person col = new Person("col");
Person dan = new Person("dan");
Person ed = new Person("ed");
Person fred = new Person("fred");
Person gav = new Person("gav");
Person hal = new Person("hal");
Person ian = new Person("ian");
Person jon = new Person("jon");
Person abi = new Person("abi");
Person bea = new Person("bea");
Person cath = new Person("cath");
Person dee = new Person("dee");
Person eve = new Person("eve");
Person fay = new Person("fay");
Person gay = new Person("gay");
Person hope = new Person("hope");
Person ivy = new Person("ivy");
Person jan = new Person("jan");
abe.Prefs = new List<Person>() {abi, eve, cath, ivy, jan, dee, fay, bea, hope, gay};
bob.Prefs = new List<Person>() {cath, hope, abi, dee, eve, fay, bea, jan, ivy, gay};
col.Prefs = new List<Person>() {hope, eve, abi, dee, bea, fay, ivy, gay, cath, jan};
dan.Prefs = new List<Person>() {ivy, fay, dee, gay, hope, eve, jan, bea, cath, abi};
ed.Prefs = new List<Person>() {jan, dee, bea, cath, fay, eve, abi, ivy, hope, gay};
fred.Prefs = new List<Person>() {bea, abi, dee, gay, eve, ivy, cath, jan, hope, fay};
gav.Prefs = new List<Person>() {gay, eve, ivy, bea, cath, abi, dee, hope, jan, fay};
hal.Prefs = new List<Person>() {abi, eve, hope, fay, ivy, cath, jan, bea, gay, dee};
ian.Prefs = new List<Person>() {hope, cath, dee, gay, bea, abi, fay, ivy, jan, eve};
jon.Prefs = new List<Person>() {abi, fay, jan, gay, eve, bea, dee, cath, ivy, hope};
abi.Prefs = new List<Person>() {bob, fred, jon, gav, ian, abe, dan, ed, col, hal};
bea.Prefs = new List<Person>() {bob, abe, col, fred, gav, dan, ian, ed, jon, hal};
cath.Prefs = new List<Person>() {fred, bob, ed, gav, hal, col, ian, abe, dan, jon};
dee.Prefs = new List<Person>() {fred, jon, col, abe, ian, hal, gav, dan, bob, ed};
eve.Prefs = new List<Person>() {jon, hal, fred, dan, abe, gav, col, ed, ian, bob};
fay.Prefs = new List<Person>() {bob, abe, ed, ian, jon, dan, fred, gav, col, hal};
gay.Prefs = new List<Person>() {jon, gav, hal, fred, bob, abe, col, ed, dan, ian};
hope.Prefs = new List<Person>() {gav, jon, bob, abe, ian, dan, hal, ed, col, fred};
ivy.Prefs = new List<Person>() {ian, col, hal, gav, fred, bob, abe, ed, jon, dan};
jan.Prefs = new List<Person>() {ed, hal, gav, abe, bob, jon, col, ian, fred, dan};
List<Person> men = new List<Person>(abi.Prefs);
int freeMenCount = men.Count;
while (freeMenCount > 0) {
foreach (Person guy in men) {
if (guy.Fiance == null) {
Person gal = guy.NextCandidateNotYetProposedTo();
if (gal.Fiance == null) {
guy.EngageTo(gal);
freeMenCount--;
} else if (gal.Prefers(guy)) {
guy.EngageTo(gal);
}
}
}
}
foreach (Person guy in men) {
Console.WriteLine("{0} is engaged to {1}", guy.Name, guy.Fiance.Name);
}
Console.WriteLine("Stable = {0}", IsStable(men));
Console.WriteLine("\nSwitching fred & jon's partners");
Person jonsFiance = jon.Fiance;
Person fredsFiance = fred.Fiance;
fred.EngageTo(jonsFiance);
jon.EngageTo(fredsFiance);
Console.WriteLine("Stable = {0}", IsStable(men));
}
public static void Main(string[] args)
{
DoMarriage();
}
}
}