using System;
using System.Collections;
public class SamplesStack  {

   public static void Main()  {

      // Creates and initializes a new Stack.
      Stack myStack = new Stack();
      myStack.Push("Hello");
      myStack.Push("World");
      myStack.Push("!");

      // Displays the properties and values of the Stack.
      Console.WriteLine( "myStack" );
      Console.WriteLine( "\tCount:    {0}", myStack.Count );
      Console.Write( "\tValues:" );
      PrintValues( myStack );
   }

   public static void PrintValues( IEnumerable myCollection )  {
      foreach ( Object obj in myCollection )
         Console.Write( "    {0}", obj );
      Console.WriteLine();
   }
}


/*
This code produces the following output.
myStack
    Count:    3
    Values:    !    World    Hello
*/

using System;
using System.Collections.Generic;

class Example
{
    public static void Main()
    {
        Stack<string> numbers = new Stack<string>();
        numbers.Push("one");
        numbers.Push("two");
        numbers.Push("three");
        numbers.Push("four");
        numbers.Push("five");

        // A stack can be enumerated without disturbing its contents.
        foreach( string number in numbers )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nPopping '{0}'", numbers.Pop());
        Console.WriteLine("Peek at next item to destack: {0}",
            numbers.Peek());
        Console.WriteLine("Popping '{0}'", numbers.Pop());

        // Create a copy of the stack, using the ToArray method and the
        // constructor that accepts an IEnumerable<T>.
        Stack<string> stack2 = new Stack<string>(numbers.ToArray());

        Console.WriteLine("\nContents of the first copy:");
        foreach( string number in stack2 )
        {
            Console.WriteLine(number);
        }

        // Create an array twice the size of the stack and copy the
        // elements of the stack, starting at the middle of the
        // array.
        string[] array2 = new string[numbers.Count * 2];
        numbers.CopyTo(array2, numbers.Count);

        // Create a second stack, using the constructor that accepts an
        // IEnumerable(Of T).
        Stack<string> stack3 = new Stack<string>(array2);

        Console.WriteLine("\nContents of the second copy, with duplicates and nulls:");
        foreach( string number in stack3 )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nstack2.Contains(\"four\") = {0}",
            stack2.Contains("four"));

        Console.WriteLine("\nstack2.Clear()");
        stack2.Clear();
        Console.WriteLine("\nstack2.Count = {0}", stack2.Count);
    }
}

/* This code example produces the following output:
five
four
three
two
one
Popping 'five'
Peek at next item to destack: four
Popping 'four'
Contents of the first copy:
one
two
three
Contents of the second copy, with duplicates and nulls:
one
two
three
stack2.Contains("four") = False
stack2.Clear()
stack2.Count = 0
 */

 using System;
 using System.Collections;
 public class SamplesQueue  {

    public static void Main()  {

       // Creates and initializes a new Queue.
       Queue myQ = new Queue();
       myQ.Enqueue("Hello");
       myQ.Enqueue("World");
       myQ.Enqueue("!");

       // Displays the properties and values of the Queue.
       Console.WriteLine( "myQ" );
       Console.WriteLine( "\tCount:    {0}", myQ.Count );
       Console.Write( "\tValues:" );
       PrintValues( myQ );
    }

    public static void PrintValues( IEnumerable myCollection )  {
       foreach ( Object obj in myCollection )
          Console.Write( "    {0}", obj );
       Console.WriteLine();
    }
 }
 /*
 This code produces the following output.
 myQ
     Count:    3
     Values:    Hello    World    !
*/

using System;
using System.Collections.Generic;

class Example
{
    public static void Main()
    {
        Queue<string> numbers = new Queue<string>();
        numbers.Enqueue("one");
        numbers.Enqueue("two");
        numbers.Enqueue("three");
        numbers.Enqueue("four");
        numbers.Enqueue("five");

        // A queue can be enumerated without disturbing its contents.
        foreach( string number in numbers )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nDequeuing '{0}'", numbers.Dequeue());
        Console.WriteLine("Peek at next item to dequeue: {0}",
            numbers.Peek());
        Console.WriteLine("Dequeuing '{0}'", numbers.Dequeue());

        // Create a copy of the queue, using the ToArray method and the
        // constructor that accepts an IEnumerable<T>.
        Queue<string> queueCopy = new Queue<string>(numbers.ToArray());

        Console.WriteLine("\nContents of the first copy:");
        foreach( string number in queueCopy )
        {
            Console.WriteLine(number);
        }

        // Create an array twice the size of the queue and copy the
        // elements of the queue, starting at the middle of the
        // array.
        string[] array2 = new string[numbers.Count * 2];
        numbers.CopyTo(array2, numbers.Count);

        // Create a second queue, using the constructor that accepts an
        // IEnumerable(Of T).
        Queue<string> queueCopy2 = new Queue<string>(array2);

        Console.WriteLine("\nContents of the second copy, with duplicates and nulls:");
        foreach( string number in queueCopy2 )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nqueueCopy.Contains(\"four\") = {0}",
            queueCopy.Contains("four"));

        Console.WriteLine("\nqueueCopy.Clear()");
        queueCopy.Clear();
        Console.WriteLine("\nqueueCopy.Count = {0}", queueCopy.Count);
    }
}

/* This code example produces the following output:
one
two
three
four
five
Dequeuing 'one'
Peek at next item to dequeue: two
Dequeuing 'two'
Contents of the copy:
three
four
five
Contents of the second copy, with duplicates and nulls:
three
four
five
queueCopy.Contains("four") = True
queueCopy.Clear()
queueCopy.Count = 0
 */

using System;
using System.Text;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create the link list.
        string[] words =
            { "the", "fox", "jumps", "over", "the", "dog" };
        LinkedList<string> sentence = new LinkedList<string>(words);
        Display(sentence, "The linked list values:");
        Console.WriteLine("sentence.Contains(\"jumps\") = {0}",
            sentence.Contains("jumps"));

        // Add the word 'today' to the beginning of the linked list.
        sentence.AddFirst("today");
        Display(sentence, "Test 1: Add 'today' to beginning of the list:");

        // Move the first node to be the last node.
        LinkedListNode<string> mark1 = sentence.First;
        sentence.RemoveFirst();
        sentence.AddLast(mark1);
        Display(sentence, "Test 2: Move first node to be last node:");

        // Change the last node to 'yesterday'.
        sentence.RemoveLast();
        sentence.AddLast("yesterday");
        Display(sentence, "Test 3: Change the last node to 'yesterday':");

        // Move the last node to be the first node.
        mark1 = sentence.Last;
        sentence.RemoveLast();
        sentence.AddFirst(mark1);
        Display(sentence, "Test 4: Move last node to be first node:");

        // Indicate the last occurence of 'the'.
        sentence.RemoveFirst();
        LinkedListNode<string> current = sentence.FindLast("the");
        IndicateNode(current, "Test 5: Indicate last occurence of 'the':");

        // Add 'lazy' and 'old' after 'the' (the LinkedListNode named current).
        sentence.AddAfter(current, "old");
        sentence.AddAfter(current, "lazy");
        IndicateNode(current, "Test 6: Add 'lazy' and 'old' after 'the':");

        // Indicate 'fox' node.
        current = sentence.Find("fox");
        IndicateNode(current, "Test 7: Indicate the 'fox' node:");

        // Add 'quick' and 'brown' before 'fox':
        sentence.AddBefore(current, "quick");
        sentence.AddBefore(current, "brown");
        IndicateNode(current, "Test 8: Add 'quick' and 'brown' before 'fox':");

        // Keep a reference to the current node, 'fox',
        // and to the previous node in the list. Indicate the 'dog' node.
        mark1 = current;
        LinkedListNode<string> mark2 = current.Previous;
        current = sentence.Find("dog");
        IndicateNode(current, "Test 9: Indicate the 'dog' node:");

        // The AddBefore method throws an InvalidOperationException
        // if you try to add a node that already belongs to a list.
        Console.WriteLine("Test 10: Throw exception by adding node (fox) already in the list:");
        try
        {
            sentence.AddBefore(current, mark1);
        }
        catch (InvalidOperationException ex)
        {
            Console.WriteLine("Exception message: {0}", ex.Message);
        }
        Console.WriteLine();

        // Remove the node referred to by mark1, and then add it
        // before the node referred to by current.
        // Indicate the node referred to by current.
        sentence.Remove(mark1);
        sentence.AddBefore(current, mark1);
        IndicateNode(current, "Test 11: Move a referenced node (fox) before the current node (dog):");

        // Remove the node referred to by current.
        sentence.Remove(current);
        IndicateNode(current, "Test 12: Remove current node (dog) and attempt to indicate it:");

        // Add the node after the node referred to by mark2.
        sentence.AddAfter(mark2, current);
        IndicateNode(current, "Test 13: Add node removed in test 11 after a referenced node (brown):");

        // The Remove method finds and removes the
        // first node that that has the specified value.
        sentence.Remove("old");
        Display(sentence, "Test 14: Remove node that has the value 'old':");

        // When the linked list is cast to ICollection(Of String),
        // the Add method adds a node to the end of the list.
        sentence.RemoveLast();
        ICollection<string> icoll = sentence;
        icoll.Add("rhinoceros");
        Display(sentence, "Test 15: Remove last node, cast to ICollection, and add 'rhinoceros':");

        Console.WriteLine("Test 16: Copy the list to an array:");
        // Create an array with the same number of
        // elements as the linked list.
        string[] sArray = new string[sentence.Count];
        sentence.CopyTo(sArray, 0);

        foreach (string s in sArray)
        {
            Console.WriteLine(s);
        }

        // Release all the nodes.
        sentence.Clear();

        Console.WriteLine();
        Console.WriteLine("Test 17: Clear linked list. Contains 'jumps' = {0}",
            sentence.Contains("jumps"));

        Console.ReadLine();
    }

    private static void Display(LinkedList<string> words, string test)
    {
        Console.WriteLine(test);
        foreach (string word in words)
        {
            Console.Write(word + " ");
        }
        Console.WriteLine();
        Console.WriteLine();
    }

    private static void IndicateNode(LinkedListNode<string> node, string test)
    {
        Console.WriteLine(test);
        if (node.List == null)
        {
            Console.WriteLine("Node '{0}' is not in the list.\n",
                node.Value);
            return;
        }

        StringBuilder result = new StringBuilder("(" + node.Value + ")");
        LinkedListNode<string> nodeP = node.Previous;

        while (nodeP != null)
        {
            result.Insert(0, nodeP.Value + " ");
            nodeP = nodeP.Previous;
        }

        node = node.Next;
        while (node != null)
        {
            result.Append(" " + node.Value);
            node = node.Next;
        }

        Console.WriteLine(result);
        Console.WriteLine();
    }
}

//This code example produces the following output:
//
//The linked list values:
//the fox jumps over the dog

//Test 1: Add 'today' to beginning of the list:
//today the fox jumps over the dog

//Test 2: Move first node to be last node:
//the fox jumps over the dog today

//Test 3: Change the last node to 'yesterday':
//the fox jumps over the dog yesterday

//Test 4: Move last node to be first node:
//yesterday the fox jumps over the dog

//Test 5: Indicate last occurence of 'the':
//the fox jumps over (the) dog

//Test 6: Add 'lazy' and 'old' after 'the':
//the fox jumps over (the) lazy old dog

//Test 7: Indicate the 'fox' node:
//the (fox) jumps over the lazy old dog

//Test 8: Add 'quick' and 'brown' before 'fox':
//the quick brown (fox) jumps over the lazy old dog

//Test 9: Indicate the 'dog' node:
//the quick brown fox jumps over the lazy old (dog)

//Test 10: Throw exception by adding node (fox) already in the list:
//Exception message: The LinkedList node belongs a LinkedList.

//Test 11: Move a referenced node (fox) before the current node (dog):
//the quick brown jumps over the lazy old fox (dog)

//Test 12: Remove current node (dog) and attempt to indicate it:
//Node 'dog' is not in the list.

//Test 13: Add node removed in test 11 after a referenced node (brown):
//the quick brown (dog) jumps over the lazy old fox

//Test 14: Remove node that has the value 'old':
//the quick brown dog jumps over the lazy fox

//Test 15: Remove last node, cast to ICollection, and add 'rhinoceros':
//the quick brown dog jumps over the lazy rhinoceros

//Test 16: Copy the list to an array:
//the
//quick
//brown
//dog
//jumps
//over
//the
//lazy
//rhinoceros

//Test 17: Clear linked list. Contains 'jumps' = False
//

// Create a new dictionary of strings, with string keys.
//
Dictionary<string, string> openWith =
    new Dictionary<string, string>();

// Add some elements to the dictionary. There are no
// duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("rtf", "wordpad.exe");

// The Add method throws an exception if the new key is
// already in the dictionary.
try
{
    openWith.Add("txt", "winword.exe");
}
catch (ArgumentException)
{
    Console.WriteLine("An element with Key = \"txt\" already exists.");
}

// The Item property is another name for the indexer, so you
// can omit its name when accessing elements.
Console.WriteLine("For key = \"rtf\", value = {0}.",
    openWith["rtf"]);

// The indexer can be used to change the value associated
// with a key.
openWith["rtf"] = "winword.exe";
Console.WriteLine("For key = \"rtf\", value = {0}.",
    openWith["rtf"]);

// If a key does not exist, setting the indexer for that key
// adds a new key/value pair.
openWith["doc"] = "winword.exe";

// The indexer throws an exception if the requested key is
// not in the dictionary.
try
{
    Console.WriteLine("For key = \"tif\", value = {0}.",
        openWith["tif"]);
}
catch (KeyNotFoundException)
{
    Console.WriteLine("Key = \"tif\" is not found.");
}

// When a program often has to try keys that turn out not to
// be in the dictionary, TryGetValue can be a more efficient
// way to retrieve values.
string value = "";
if (openWith.TryGetValue("tif", out value))
{
    Console.WriteLine("For key = \"tif\", value = {0}.", value);
}
else
{
    Console.WriteLine("Key = \"tif\" is not found.");
}

// ContainsKey can be used to test keys before inserting
// them.
if (!openWith.ContainsKey("ht"))
{
    openWith.Add("ht", "hypertrm.exe");
    Console.WriteLine("Value added for key = \"ht\": {0}",
        openWith["ht"]);
}

// When you use foreach to enumerate dictionary elements,
// the elements are retrieved as KeyValuePair objects.
Console.WriteLine();
foreach( KeyValuePair<string, string> kvp in openWith )
{
    Console.WriteLine("Key = {0}, Value = {1}",
        kvp.Key, kvp.Value);
}

// To get the values alone, use the Values property.
Dictionary<string, string>.ValueCollection valueColl =
    openWith.Values;

// The elements of the ValueCollection are strongly typed
// with the type that was specified for dictionary values.
Console.WriteLine();
foreach( string s in valueColl )
{
    Console.WriteLine("Value = {0}", s);
}

// To get the keys alone, use the Keys property.
Dictionary<string, string>.KeyCollection keyColl =
    openWith.Keys;

// The elements of the KeyCollection are strongly typed
// with the type that was specified for dictionary keys.
Console.WriteLine();
foreach( string s in keyColl )
{
    Console.WriteLine("Key = {0}", s);
}

// Use the Remove method to remove a key/value pair.
Console.WriteLine("\nRemove(\"doc\")");
openWith.Remove("doc");

if (!openWith.ContainsKey("doc"))
{
    Console.WriteLine("Key \"doc\" is not found.");
}

/* This code example produces the following output:
An element with Key = "txt" already exists.
For key = "rtf", value = wordpad.exe.
For key = "rtf", value = winword.exe.
Key = "tif" is not found.
Key = "tif" is not found.
Value added for key = "ht": hypertrm.exe
Key = txt, Value = notepad.exe
Key = bmp, Value = paint.exe
Key = dib, Value = paint.exe
Key = rtf, Value = winword.exe
Key = doc, Value = winword.exe
Key = ht, Value = hypertrm.exe
Value = notepad.exe
Value = paint.exe
Value = paint.exe
Value = winword.exe
Value = winword.exe
Value = hypertrm.exe
Key = txt
Key = bmp
Key = dib
Key = rtf
Key = doc
Key = ht
Remove("doc")
Key "doc" is not found.
*/

ass Program  
{  
    static void Main(string[] args)  
    {  
        // Create an array of 10 elements    
        int[] IntArray = new int[10] { 1, 3, 5, 7, 11, 13, 17, 19, 23, 31 };  
        // Value to search for    
        int target = 17;  
        int pos = Array.BinarySearch(IntArray, target);  
        if (pos >= 0)  
            Console.WriteLine($"Item {IntArray[pos].ToString()} found at position {pos + 1}.");  
        else  
            Console.WriteLine("Item not found");  
        Console.ReadKey();  
    }