Step by Step solution about How to resolve the algorithm Sort a list of object identifiers step by step in the C# programming language

The provided code is a C# program that sorts an array of Object Identifiers (OIDs) in lexicographical order. OIDs are hierarchical identifiers used in various network protocols, such as SNMP and LDAP.

Here's a detailed breakdown of the code:

1. Input Array:

   • The code defines an array called oids containing several OID strings. Each OID is represented as a dot-separated sequence of integers.

2. Custom Comparer:

   • A custom comparer is defined using Comparer<string>.Create. This comparer is used to sort the OIDs.
   • The comparer takes two OID strings as input and compares them element by element. It uses the Zip method to pair up the corresponding elements from both OIDs and compares them using CompareTo.
   • If any element comparison results in a non-zero value, it returns that value. Otherwise, it compares the lengths of the two OIDs to break ties.

3. Sorting:

   • The Array.Sort method is used to sort the oids array using the custom comparer.

4. Output:

   • After sorting, the sorted OIDs are printed to the console using Console.WriteLine.

Here's an example of how the code works:

Consider the following unsorted array of OIDs:

["1.3.6.1.4.1.11.2.17.19.3.4.0.10",
"1.3.6.1.4.1.11.2.17.5.2.0.79",
"1.3.6.1.4.1.11.2.17.19.3.4.0.4",
"1.3.6.1.4.1.11150.3.4.0.1",
"1.3.6.1.4.1.11.2.17.19.3.4.0.1",
"1.3.6.1.4.1.11150.3.4.0"]

When sorted using the custom comparer, the output would be:

1.3.6.1.4.1.11.2.17.19.3.4.0.1
1.3.6.1.4.1.11.2.17.19.3.4.0.4
1.3.6.1.4.1.11.2.17.19.3.4.0.10
1.3.6.1.4.1.11.2.17.5.2.0.79
1.3.6.1.4.1.11150.3.4.0
1.3.6.1.4.1.11150.3.4.0.1

In this sorted order, OIDs with shorter lengths are placed before those with longer lengths. Within OIDs of the same length, they are arranged in ascending order based on their individual elements.

using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public static void Main() {
        var oids = new [] {
            "1.3.6.1.4.1.11.2.17.19.3.4.0.10",
            "1.3.6.1.4.1.11.2.17.5.2.0.79",
            "1.3.6.1.4.1.11.2.17.19.3.4.0.4",
            "1.3.6.1.4.1.11150.3.4.0.1",
            "1.3.6.1.4.1.11.2.17.19.3.4.0.1",
            "1.3.6.1.4.1.11150.3.4.0"
        };

        var comparer = Comparer<string>.Create((a, b) => {
            int c = a.Split('.').Select(int.Parse)
	        .Zip(b.Split('.').Select(int.Parse),
                    (i, j) => i.CompareTo(j)).FirstOrDefault(x => x != 0);
            return c != 0 ? c : a.Length.CompareTo(b.Length);
        });

        Array.Sort(oids, comparer);

        Console.WriteLine(string.Join(Environment.NewLine, oids));
    }
}