How to add element in a array of List of List

Question

4.00/5 (1 vote)

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Hello.
I created a array like :
List<List<ulong>>[] Lst = new List<List<ulong>>[20000];

How can I access the List of List in some index like Lst[1500] and add new List into that List of List? If a want to print the element of Lst[1500] then should I use this code:

<br />
var LstLst = Lst[1000];<br />
foreach (var LL in LstLst)<code>

{
foreach (var i in LL)
{
Console.Write(i);
}
Console.WriteLine();
}

??
Please help.

Posted 8-Feb-10 9:21am

Tapas Bose

Add a Solution

5 solutions

Solution 2

Not clear. Here is my code:

using System;<br />
using System.Collections.Generic;<br />
<br />
class CoveringCuboid<br />
{<br />
    static void Main()<br />
    {<br />
        List<List<ulong>>[] Lst = new List<List<ulong>>[20000];<br />
        DateTime StartTime = DateTime.Now;<br />
<br />
        ulong Limit = 20000;<br />
        ulong[] LayerArray = new ulong[Limit + 1];<br />
        <br />
        for (ulong X = 1; NumberOfBlock(X,X,X,1)<=Limit; X++)<br />
        {<br />
            for (ulong Y = X; NumberOfBlock(X, Y, Y, 1) <= Limit; Y++)<br />
            {<br />
                for (ulong Z = Y; NumberOfBlock(X, Y, Z, 1) <= Limit; Z++)<br />
                {<br />
                    for (ulong Layer = 1; NumberOfBlock(X, Y, Z, Layer) <= Limit; Layer++)<br />
                    {<br />
                        LayerArray[NumberOfBlock(X, Y, Z, Layer)]++;<br />
                        //I want to add here X, Y, Z, Layer, in the existing List at the index of <br />
                        //Lst[NumberOfBlock(x, Y, Z, Layer)].<br />
                    }<br />
                }<br />
            }<br />
        }<br />
<br />
        Console.WriteLine("\n  Result : " + Array.IndexOf<ulong>(LayerArray, 1000));<br />
<br />
        DateTime EndTime = DateTime.Now;<br />
<br />
        TimeSpan ExecutionTime = EndTime - StartTime;<br />
<br />
        Console.WriteLine("\n  Total Execution Time : {0} millisec.\n", ExecutionTime.TotalMilliseconds);<br />
<br />
        var a = Lst[1000];<br />
<br />
        foreach (var b in a)<br />
        {<br />
            foreach (var c in b)<br />
            {<br />
                Console.Write(c);<br />
<br />
            }<br />
            Console.WriteLine();<br />
        }<br />
    }<br />
<br />
    static ulong NumberOfBlock(ulong X, ulong Y, ulong Z, ulong Layer)<br />
    { <br />
        return 4 * (X + Y + Z + Layer - 2) * (Layer - 1) + 2 * (X * Y + X * Z + Y * Z);<br />
    }<br />
}

Posted 8-Feb-10 18:31pm

Tapas Bose

Solution 4

Dictionary is ok but is it possible to create such a data structure?

Posted 9-Feb-10 3:46am

Tapas Bose

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Christian Graus · Accepted Answer · 2010-02-08T09:31:00

Solution 1

Lst.Add(new List<ulong>); will add another list.

You access the internal lists by index.

Posted 8-Feb-10 9:31am

Christian Graus

Abhinav S · Accepted Answer · 2010-02-09T03:43:00

Solution 3

You could consider using some other collection like a Dictionary or a Hashtable instead of using a List of a List.

Posted 9-Feb-10 3:43am

Abhinav S

v2

AspDotNetDev · Accepted Answer · 2010-02-09T04:19:00

Solution 5

C#

Lst[1500].Add(new List<ulong>());

Yes, you could print the list of lists out that way. Though you might want to change Console.Write(i); to Console.Write(i.ToString() + " ");.

Posted 9-Feb-10 4:19am

AspDotNetDev