122 lines
4.2 KiB
JavaScript
122 lines
4.2 KiB
JavaScript
function Person(name) {
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var candidateIndex = 0;
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this.name = name;
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this.fiance = null;
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this.candidates = [];
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this.rank = function(p) {
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for (i = 0; i < this.candidates.length; i++)
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if (this.candidates[i] === p) return i;
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return this.candidates.length + 1;
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}
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this.prefers = function(p) {
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return this.rank(p) < this.rank(this.fiance);
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}
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this.nextCandidate = function() {
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if (candidateIndex >= this.candidates.length) return null;
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return this.candidates[candidateIndex++];
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}
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this.engageTo = function(p) {
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if (p.fiance) p.fiance.fiance = null;
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p.fiance = this;
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if (this.fiance) this.fiance.fiance = null;
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this.fiance = p;
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}
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this.swapWith = function(p) {
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console.log("%s & %s swap partners", this.name, p.name);
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var thisFiance = this.fiance;
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var pFiance = p.fiance;
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this.engageTo(pFiance);
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p.engageTo(thisFiance);
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}
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}
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function isStable(guys, gals) {
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for (var i = 0; i < guys.length; i++)
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for (var j = 0; j < gals.length; j++)
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if (guys[i].prefers(gals[j]) && gals[j].prefers(guys[i]))
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return false;
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return true;
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}
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function engageEveryone(guys) {
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var done;
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do {
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done = true;
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for (var i = 0; i < guys.length; i++) {
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var guy = guys[i];
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if (!guy.fiance) {
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done = false;
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var gal = guy.nextCandidate();
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if (!gal.fiance || gal.prefers(guy))
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guy.engageTo(gal);
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}
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}
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} while (!done);
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}
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function doMarriage() {
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var abe = new Person("Abe");
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var bob = new Person("Bob");
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var col = new Person("Col");
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var dan = new Person("Dan");
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var ed = new Person("Ed");
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var fred = new Person("Fred");
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var gav = new Person("Gav");
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var hal = new Person("Hal");
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var ian = new Person("Ian");
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var jon = new Person("Jon");
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var abi = new Person("Abi");
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var bea = new Person("Bea");
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var cath = new Person("Cath");
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var dee = new Person("Dee");
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var eve = new Person("Eve");
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var fay = new Person("Fay");
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var gay = new Person("Gay");
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var hope = new Person("Hope");
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var ivy = new Person("Ivy");
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var jan = new Person("Jan");
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abe.candidates = [abi, eve, cath, ivy, jan, dee, fay, bea, hope, gay];
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bob.candidates = [cath, hope, abi, dee, eve, fay, bea, jan, ivy, gay];
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col.candidates = [hope, eve, abi, dee, bea, fay, ivy, gay, cath, jan];
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dan.candidates = [ivy, fay, dee, gay, hope, eve, jan, bea, cath, abi];
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ed.candidates = [jan, dee, bea, cath, fay, eve, abi, ivy, hope, gay];
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fred.candidates = [bea, abi, dee, gay, eve, ivy, cath, jan, hope, fay];
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gav.candidates = [gay, eve, ivy, bea, cath, abi, dee, hope, jan, fay];
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hal.candidates = [abi, eve, hope, fay, ivy, cath, jan, bea, gay, dee];
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ian.candidates = [hope, cath, dee, gay, bea, abi, fay, ivy, jan, eve];
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jon.candidates = [abi, fay, jan, gay, eve, bea, dee, cath, ivy, hope];
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abi.candidates = [bob, fred, jon, gav, ian, abe, dan, ed, col, hal];
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bea.candidates = [bob, abe, col, fred, gav, dan, ian, ed, jon, hal];
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cath.candidates = [fred, bob, ed, gav, hal, col, ian, abe, dan, jon];
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dee.candidates = [fred, jon, col, abe, ian, hal, gav, dan, bob, ed];
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eve.candidates = [jon, hal, fred, dan, abe, gav, col, ed, ian, bob];
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fay.candidates = [bob, abe, ed, ian, jon, dan, fred, gav, col, hal];
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gay.candidates = [jon, gav, hal, fred, bob, abe, col, ed, dan, ian];
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hope.candidates = [gav, jon, bob, abe, ian, dan, hal, ed, col, fred];
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ivy.candidates = [ian, col, hal, gav, fred, bob, abe, ed, jon, dan];
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jan.candidates = [ed, hal, gav, abe, bob, jon, col, ian, fred, dan];
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var guys = [abe, bob, col, dan, ed, fred, gav, hal, ian, jon];
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var gals = [abi, bea, cath, dee, eve, fay, gay, hope, ivy, jan];
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engageEveryone(guys);
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for (var i = 0; i < guys.length; i++) {
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console.log("%s is engaged to %s", guys[i].name, guys[i].fiance.name);
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}
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console.log("Stable = %s", isStable(guys, gals) ? "Yes" : "No");
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jon.swapWith(fred);
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console.log("Stable = %s", isStable(guys, gals) ? "Yes" : "No");
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}
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doMarriage();
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