static void Main(string[] args)
{
//ActivitySelectionProblem activitySelectionProblem = new ActivitySelectionProblem();
//KruskalsMSTalgorithm kruskalsMSTalgorithm = new KruskalsMSTalgorithm();
#region Disjoint Union Set
int n = 5;
DisjointUnionSets disjointUnionSets = new DisjointUnionSets(n);
// make relations
disjointUnionSets.Union(0, 2); // 0 is a friend of 2
disjointUnionSets.Union(4, 2); // 4 is a friend of 2
disjointUnionSets.Union(3, 1); // 3 is a friend of 1
if (disjointUnionSets.Find(4) == disjointUnionSets.Find(0)) // Check if 4 is a friend of 0
{
Console.WriteLine("Yes");
}
else
{
Console.WriteLine("No");
}
if (disjointUnionSets.Find(1) == disjointUnionSets.Find(0)) // Check if 1 is a friend of 0
{
Console.WriteLine("Yes");
}
else
{
Console.WriteLine("No");
}
#endregion
#region Program to detect cycle in a graph
GraphDSOptimized.GraphDS graph = new GraphDSOptimized.GraphDS(3, 3);
// Add edge 0-1
graph.Edges[0].Src = 0;
graph.Edges[0].Dest = 1;
// Add edge 1-2
graph.Edges[1].Src = 1;
graph.Edges[1].Dest = 2;
// Add edge 0-2
graph.Edges[2].Src = 0;
graph.Edges[2].Dest = 2;
Console.WriteLine(graph.HasCycle() ? "Graph contains cycle." : "Graph doesn't contain cycle.");
#endregion
#region Kruskal MST Optimized
KrushkalMSTAlgorithmOptimized krushkalMSTAlgorithmOptimized = new KrushkalMSTAlgorithmOptimized();
var resultMST = krushkalMSTAlgorithmOptimized.KruskalMST();
krushkalMSTAlgorithmOptimized.PrintMSTResult(resultMST);
#endregion
}
private static void TestDisjointSet()
{
var n = 5;
var dus = new DisjointUnionSets(5);
dus.Union(0, 2);
dus.Union(4, 2);
dus.Union(3, 1);
Console.WriteLine(dus.Find(4) == dus.Find(0));
Console.WriteLine(dus.Find(1) == dus.Find(0));
}
public IList <IList <string> > AccountsMerge(IList <IList <string> > accounts)
{
var unionSet = new DisjointUnionSets(10001);
var emailToName = new Dictionary <string, string>();
var emailToId = new Dictionary <string, int>();
var id = 0;
foreach (var account in accounts)
{
var name = account[0];
for (var i = 1; i < account.Count; i++)
{
var email = account[i];
emailToName[email] = name;
if (!emailToId.ContainsKey(email))
{
emailToId[email] = id++;
}
unionSet.Union(emailToId[account[1]], emailToId[email]);
}
}
var result = new Dictionary <int, List <string> >();
foreach (var email in emailToName.Keys)
{
var index = unionSet.Find(emailToId[email]);
if (!result.ContainsKey(index))
{
result[index] = new List <string>();
}
result[index].Add(email);
}
foreach (var emails in result.Values)
{
emails.Sort(string.CompareOrdinal);
emails.Insert(0, emailToName[emails[0]]);
}
return(new List <IList <string> >(result.Values));
}
