public void Dequeue()
{
_queue.Enqueue(3);
_queue.Enqueue(4);
Assert.IsTrue(_queue.Dequeue() == 3);
Assert.IsTrue(_queue.Dequeue() == 4);
var ex = Assert.Throws <InvalidOperationException>(() => _queue.Dequeue());
Assert.IsTrue(ex.Message == ExceptionMessage);
}
public void TestQueue()
{
var queue = new QueueLinkedList<int>();
queue.Enqueue(10);
Assert.Equal(1, queue.Count);
queue.Enqueue(20);
Assert.Equal(2, queue.Count);
Assert.False(queue.IsEmpty);
Assert.Equal(10, queue.Dequeue());
Assert.Equal(20, queue.Dequeue());
Assert.True(queue.IsEmpty);
}
public static T BreadthFirstSearch <T>(this Graph <T> graph, Func <T, bool> matchFunc)
where T : class
{
if (graph.IsEmpty)
{
return(null);
}
graph.Nodes.ForEach(x => x._isVisited = false);
IQueue <GraphNode <T> > queue = new QueueLinkedList <GraphNode <T> >();
queue.Enqueue(graph.Nodes[0]);
while (!queue.IsEmpty)
{
var node = queue.Dequeue();
if (node._isVisited)
{
continue;
}
if (matchFunc(node.Data))
{
return(node.Data);
}
node.Edges.ForEach(x => queue.Enqueue(x.To));
node._isVisited = true;
}
return(null);
}
public void LevelOrderTraversal()
{
if (_rootNode == null)
{
Console.WriteLine("Tree is empty!");
return;
}
var queue = new QueueLinkedList <NodeTree <TData> >();
queue.Enqueue(_rootNode);
while (queue.Size() != 0)
{
var dequeuedElement = queue.Dequeue();
Console.WriteLine(dequeuedElement.Data);
if (dequeuedElement.LeftChild != null)
{
queue.Enqueue(dequeuedElement.LeftChild);
}
if (dequeuedElement.RightChild != null)
{
queue.Enqueue(dequeuedElement.RightChild);
}
}
Console.WriteLine();
}
public BreadthFirstSearch(Graph G, int s)
{
var V = G.V();
this.s = s;
var queue = new QueueLinkedList <int>();
queue.Enqueue(s);
marked = new bool[V];
edgeTo = new int[V];
marked[s] = true;
while (!queue.IsEmpty)
{
var v = queue.Dequeue();
foreach (var w in G.adj(v))
{
if (marked[w])
{
continue;
}
edgeTo[w] = v;
marked[w] = true;
queue.Enqueue(w);
}
}
}
private bool HasAugmentedPath(FlowNetwork G)
{
var V = G.V();
edgeTo = new FlowEdge[V];
marked = new bool[V];
var queue = new QueueLinkedList <int>();
queue.Enqueue(s);
while (!queue.IsEmpty)
{
var x = queue.Dequeue();
marked[x] = true;
foreach (var e in G.adj(x))
{
var w = e.other(x);
if (!marked[w] && e.residualCapacityTo(w) > 0)
{
queue.Enqueue(w);
edgeTo[w] = e;
if (w == t)
{
return(true);
}
}
}
}
return(false);
}
/// <summary>
/// This Method is used to test the DecksOfCardsUsingQueue Class.
/// </summary>
public static void DeckOfCardsUsingQueue()
{
try
{
Console.WriteLine();
Console.WriteLine("-----------------Deck of Cards Using Queue Program-----------------");
Console.WriteLine();
string[] suits = { "Clubs", "Diamonds", "Hearts", "Spades" };
string[] rank = { "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King", "Ace" };
QueueLinkedList player1 = new QueueLinkedList();
QueueLinkedList player2 = new QueueLinkedList();
QueueLinkedList player3 = new QueueLinkedList();
QueueLinkedList player4 = new QueueLinkedList();
player1 = Utility.DeckOfCard(suits, rank);
player2 = Utility.DeckOfCard(suits, rank);
player3 = Utility.DeckOfCard(suits, rank);
player4 = Utility.DeckOfCard(suits, rank);
while (player1.Size() != 0)
{
player1.Dequeue();
}
Console.WriteLine();
while (player2.Size() != 0)
{
player2.Dequeue();
}
Console.WriteLine();
while (player3.Size() != 0)
{
player3.Dequeue();
}
Console.WriteLine();
while (player4.Size() != 0)
{
player4.Dequeue();
}
Console.WriteLine();
}
catch (Exception e)
{
Console.WriteLine("Message: {0}", e.Message);
}
}
/// <summary>
/// Breadth-first search (BFS) is an algorithm for traversing or searching tree or graph data structures.
/// Finds all vertices that can be reached by the starting vertex.
/// </summary>
/// <param name="rootVertex"></param>
/// <returns></returns>
public Dictionary <T, BfsVertexInfo <T> > BreadthFirstSearch(T rootVertex, Action <T> preVisit = null)
{
// Traversed graph information
var visitedVerticesInfo = new Dictionary <T, BfsVertexInfo <T> >();
if (!_aList.ContainsKey(rootVertex))
{
return(visitedVerticesInfo);
}
// Initialize it
foreach (var i in _aList)
{
visitedVerticesInfo[i.Key] = new BfsVertexInfo <T>();
}
// Set the distance for the root vertex
visitedVerticesInfo[rootVertex] = new BfsVertexInfo <T>()
{
Distance = 0
};
// Create a queue and add root vertex
QueueLinkedList <T> queue = new QueueLinkedList <T>();
queue.Enqueue(rootVertex);
// As long as the queue is not empty:
while (!queue.IsEmpty())
{
// Repeatedly dequeue a vertex u from the queue.
var vertex = queue.Dequeue();
Console.Write(vertex + " ");
// Trace the path
preVisit?.Invoke(vertex);
// For each neighbor v of u that has not been visited:
foreach (var neighbor in _aList[vertex])
{
if (visitedVerticesInfo[neighbor].Distance == null)
{
// Set distance to 1 greater than u's distance
visitedVerticesInfo[neighbor].Distance = visitedVerticesInfo[vertex].Distance + 1;
// Set predecessor to u
visitedVerticesInfo[neighbor].Predecessor = vertex;
// Enqueue v
queue.Enqueue(neighbor);
}
}
}
return(visitedVerticesInfo);
}
public static void Main(string[] args)
{
QueueLinkedList <int> queue = new QueueLinkedList <int>();
Console.WriteLine($"Size(): {queue.Size()}");
Console.WriteLine($"IsEmpty(): {queue.IsEmpty()}");
Console.WriteLine();
queue.Enqueue(10);
queue.Enqueue(20);
queue.Enqueue(30);
queue.Enqueue(40);
Console.WriteLine($"Size(): {queue.Size()}");
Console.WriteLine($"IsEmpty(): {queue.IsEmpty()}");
Console.WriteLine();
Console.WriteLine($"Dequeue(): {queue.Dequeue().ToString()}");
Console.WriteLine($"Dequeue(): {queue.Dequeue().ToString()}");
Console.WriteLine();
Console.WriteLine($"Size(): {queue.Size()}");
// Expected Output:
// ------------------
// Size(): 0
// IsEmpty(): True
//
// Enqueue(): 10
// Enqueue(): 20
// Enqueue(): 30
// Enqueue(): 40
//
// Size(): 4
// IsEmpty(): False
//
// Dequeue(): 10
// Dequeue(): 20
//
// Size(): 2
}
public static void TraverseBreadthFirst <T>(this SearchTree <T> tree, Action <T> action)
where T : class
{
IQueue <TreeNode <T> > queue = new QueueLinkedList <TreeNode <T> >(); // TODO test circular
queue.Enqueue(tree.Root);
while (!queue.IsEmpty)
{
var node = queue.Dequeue();
action(node.Data);
node.Children.ForEach(queue.Enqueue);
}
}
public void Test()
{
var queue = new QueueLinkedList <int>();
queue.Enqueue(1);
queue.Enqueue(2);
queue.Enqueue(3);
Assert.AreEqual("123", queue.GetValues());
Assert.AreEqual(1, queue.Dequeue());
Assert.AreEqual("23", queue.GetValues());
}
public void EmptyQueueDequeueUnderflow()
{
var queue = new QueueLinkedList <int>();
try
{
queue.Dequeue();
}
catch (InvalidOperationException ex)
{
Assert.AreEqual("The Queue is empty.", ex.Message);
}
}
static void QueueLinkedList()
{
QueueLinkedList queue = new QueueLinkedList();
queue.Enqueue(1);
queue.Enqueue(2);
queue.Enqueue(3);
queue.Enqueue(4);
queue.Enqueue(5);
queue.Enqueue(6);
queue.Enqueue(7);
foreach (int val in queue.GetEnumerator())
{
Console.WriteLine(val);
}
Console.WriteLine("Peek");
Console.WriteLine(queue.Peek());
Console.WriteLine(queue.Peek());
Console.WriteLine("Pop");
Console.WriteLine(queue.Dequeue());
Console.WriteLine(queue.Dequeue());
Console.WriteLine(queue.Dequeue());
Console.WriteLine(queue.Dequeue());
Console.WriteLine("Remaining");
foreach (int val in queue.GetEnumerator())
{
Console.WriteLine(val);
}
Console.Read();
}
public void QueueUnderflow()
{
var queue = new QueueLinkedList <int>();
var size = 1000;
for (int i = 0; i < size; i++)
{
queue.Enqueue(i);
}
for (int i = 0; i < size; i++)
{
queue.Dequeue();
}
try
{
queue.Dequeue();
}
catch (InvalidOperationException ex)
{
Assert.AreEqual("The Queue is empty.", ex.Message);
}
}
public void MultipleEnqueueDequeueReturnValues()
{
var queue = new QueueLinkedList <int>();
var size = 50;
for (int i = 0; i < size; i++)
{
queue.Enqueue(i);
}
for (int i = 0; i < size; i++)
{
var dequeued = queue.Dequeue();
Assert.AreEqual(i, dequeued);
}
}
public void StackSizeDecreases()
{
var queue = new QueueLinkedList <int>();
var size = 100;
for (int i = 0; i < size; i++)
{
queue.Enqueue(i);
}
for (int i = 0; i < size; i++)
{
queue.Dequeue();
}
Assert.AreEqual(0, queue.Size());
}
public static T BreadthFirstSearch <T>(this SearchTree <T> tree, Func <T, bool> matchFunc)
where T : class
{
IQueue <TreeNode <T> > queue = new QueueLinkedList <TreeNode <T> >();
queue.Enqueue(tree.Root);
while (!queue.IsEmpty)
{
var node = queue.Dequeue();
if (matchFunc(node.Data))
{
return(node.Data);
}
node.Children.ForEach(queue.Enqueue);
}
return(null);
}
/// <summary>
/// TODO: Add a description what is going on here
/// </summary>
/// <param name="graph"></param>
/// <param name="source"></param>
/// <returns></returns>
public static BfsVertexInfo <int?>[] DoBfs(int[][] graph, int source)
{
BfsVertexInfo <int?>[] bfsInfo = new BfsVertexInfo <int?> [graph.Length];
// Initialize bfsInfo array
for (int i = 0; i < graph.Length; i++)
{
bfsInfo[i] = new BfsVertexInfo <int?>
{
Distance = null,
Predecessor = null
};
}
bfsInfo[source].Distance = 0;
var queue = new QueueLinkedList <int>();
queue.Enqueue(source);
while (!queue.IsEmpty())
{
var u = queue.Dequeue();
for (int i = 0; i < graph[u].Length; i++)
{
var v = graph[u][i];
if (bfsInfo[v].Distance == null)
{
bfsInfo[v].Distance = bfsInfo[u].Distance + 1;
bfsInfo[v].Predecessor = u;
queue.Enqueue(v);
}
}
}
return(bfsInfo);
}
