public int MakeConnected(int n, int[][] connections)
{
if (connections.Length < n - 1)
{
return(-1);
}
QuickUnionUF uf = new QuickUnionUF(n);
int p;
int q;
for (int i = 0; i < connections.Length; i++)
{
p = connections[i][0];
q = connections[i][1];
if (uf.Find(p) != uf.Find(q))
{
uf.Uunion(p, q);
}
}
int requiredEdges = uf.Count - 1;
return(requiredEdges);
}
public void testUnionAndConnected_NewConnection()
{
QuickUnionUF quickUnionUF = new QuickUnionUF(10);
Assert.IsFalse(quickUnionUF.Connected(0, 1));
Assert.AreEqual(10, quickUnionUF.Count());
quickUnionUF.Union(0, 1);
Assert.IsTrue(quickUnionUF.Connected(0, 1));
Assert.AreEqual(9, quickUnionUF.Count());
Assert.AreEqual(1, quickUnionUF.Find(1));
Assert.AreEqual(1, quickUnionUF.Find(0));
}
public void testUnionAndConnected_MultiConnection()
{
QuickUnionUF quickUnionUF = new QuickUnionUF(10);
quickUnionUF.Union(0, 1);
quickUnionUF.Union(2, 1);
Assert.IsTrue(quickUnionUF.Connected(0, 1));
Assert.IsTrue(quickUnionUF.Connected(2, 1));
Assert.IsTrue(quickUnionUF.Connected(2, 0));
Assert.AreEqual(8, quickUnionUF.Count());
Assert.AreEqual(1, quickUnionUF.Find(1));
Assert.AreEqual(1, quickUnionUF.Find(0));
Assert.AreEqual(1, quickUnionUF.Find(2));
quickUnionUF.Union(2, 5);
Assert.IsTrue(quickUnionUF.Connected(0, 1));
Assert.IsTrue(quickUnionUF.Connected(2, 1));
Assert.IsTrue(quickUnionUF.Connected(2, 0));
Assert.IsTrue(quickUnionUF.Connected(5, 0));
Assert.IsTrue(quickUnionUF.Connected(5, 1));
Assert.IsTrue(quickUnionUF.Connected(5, 2));
Assert.AreEqual(7, quickUnionUF.Count());
Assert.AreEqual(5, quickUnionUF.Find(1));
Assert.AreEqual(5, quickUnionUF.Find(0));
Assert.AreEqual(5, quickUnionUF.Find(2));
Assert.AreEqual(5, quickUnionUF.Find(5));
}
public void testFind()
{
QuickUnionUF quickUnionUF = new QuickUnionUF(10);
for (int i = 0; i < 10; i++)
{
Assert.AreEqual(i, quickUnionUF.Find(i));
}
}
public void testFind_ParameterValidation_PLargerThanN()
{
QuickUnionUF quickUnionUF = new QuickUnionUF(10);
quickUnionUF.Find(11);
}
public void testFind_ParameterValidation_PEqualN()
{
QuickUnionUF quickUnionUF = new QuickUnionUF(10);
quickUnionUF.Find(10);
}
public void testFind_ParameterValidation_PLessThan0()
{
QuickUnionUF quickUnionUF = new QuickUnionUF(10);
quickUnionUF.Find(-1);
}
