public void DemoTest()
{
IUnionFind uf = new QuickFind(10);
uf.Union(4, 3);
int[] ids = uf.GetIds();
Assert.AreEqual(3, ids[3]);
Assert.AreEqual(3, ids[4]);
uf.Union(3, 8);
ids = uf.GetIds();
Assert.AreEqual(8, ids[3]);
Assert.AreEqual(8, ids[4]);
uf.Union(6, 5);
ids = uf.GetIds();
Assert.AreEqual(5, ids[5]);
Assert.AreEqual(5, ids[6]);
uf.Union(9, 4);
ids = uf.GetIds();
Assert.AreEqual(8, ids[4]);
Assert.AreEqual(8, ids[9]);
uf.Union(2, 1);
ids = uf.GetIds();
Assert.AreEqual(1, ids[1]);
Assert.AreEqual(1, ids[2]);
Assert.IsTrue(uf.Connected(8, 9));
Assert.IsFalse(uf.Connected(5, 0));
uf.Union(5, 0);
ids = uf.GetIds();
Assert.AreEqual(0, ids[0]);
Assert.AreEqual(0, ids[5]);
Assert.AreEqual(0, ids[6]);
uf.Union(7, 2);
ids = uf.GetIds();
Assert.AreEqual(1, ids[1]);
Assert.AreEqual(1, ids[2]);
Assert.AreEqual(1, ids[7]);
uf.Union(6, 1);
ids = uf.GetIds();
Assert.AreEqual(1, ids[0]);
Assert.AreEqual(1, ids[1]);
Assert.AreEqual(1, ids[2]);
Assert.AreEqual(8, ids[3]);
Assert.AreEqual(8, ids[4]);
Assert.AreEqual(1, ids[5]);
Assert.AreEqual(1, ids[6]);
Assert.AreEqual(1, ids[7]);
Assert.AreEqual(8, ids[8]);
Assert.AreEqual(8, ids[9]);
}
public KruskalMst(EdgeWeightedGraph graph)
{
_mst = new Queue <Edge>();
var edges = graph.Edges();
Array.Sort(edges, (edge, edge1) => edge.CompareTo(edge1));
var vertices = graph.Vertices();
var uf = new QuickFind(vertices.Length);
var count = 0;
while (count < edges.Length && _mst.Count < vertices.Length - 1)
{
var edge = edges[count];
var v = edge.Either();
var w = edge.Other(v);
if (!uf.Connected(v, w))
{
uf.Union(v, w);
_mst.Enqueue(edge);
}
count++;
}
}
public void TestQuickFind()
{
var input = new List <int[]>()
{
new int[] { 1, 3 },
new int[] { 1, 4 },
new int[] { 8, 9 }
};
var N = 10;
var uf = new QuickFind(N);
foreach (var item in input)
{
uf.Union(item[0], item[1]);
}
Assert.Equal(uf.Connected(3, 4), true);
Assert.Equal(uf.Connected(9, 0), false);
}
public void QuickFind_TinyFile_True()
{
var dots = new Dots(@"DataStore\tinyUF.txt");
var quickFind = new QuickFind(dots.Count);
foreach (Tuple <int, int> item in dots.Items)
{
if (quickFind.Connected(item.Item1, item.Item2))
{
continue;
}
quickFind.Union(item.Item1, item.Item2);
}
Assert.Equal(2, quickFind.Count);
}
