find unique combinations in csharp

To find the unique combinations in C#, we can use the Combinations method available in the System.Linq library. This method returns all possible combinations of elements from a collection. We can then use the Distinct method to filter out the duplicate combinations.

Here is an example code snippet that finds unique combinations of three elements from a list of integers:

main.cs
using System;
using System.Linq;

class Program
{
    static void Main()
    {
        var list = new[] { 1, 2, 3, 4 };

        var combinations = from a in list
                           from b in list
                           from c in list
                           where a < b && b < c
                           select new[] { a, b, c };

        var uniqueCombinations = combinations.Distinct();

        foreach (var combination in uniqueCombinations)
        {
            Console.WriteLine(string.Join(", ", combination));
        }
    }
}
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In this example, we use LINQ to generate all possible combinations of three elements from the list. Then, we use the Distinct method to get only the unique combinations. Finally, we print out the unique combinations using the Console.WriteLine method.