c# -需要用于功率集/子集组合的算法，但仅适用于固定数量的元素

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        List<int> elements = new List<int> { 1, 2, 3 };
        List<List<int>> subsets = GenerateSubsets(elements);
        
        foreach (var subset in subsets)
        {
            Console.WriteLine(string.Join(", ", subset));
        }
    }

    static List<List<int>> GenerateSubsets(List<int> elements)
    {
        List<List<int>> subsets = new List<List<int>>();
        GenerateSubsetsHelper(elements, new List<int>(), 0, subsets);
        return subsets;
    }

    static void GenerateSubsetsHelper(List<int> elements, List<int> currentSubset, int index, List<List<int>> subsets)
    {
        subsets.Add(new List<int>(currentSubset));

        for (int i = index; i < elements.Count; i++)
        {
            currentSubset.Add(elements[i]);
            GenerateSubsetsHelper(elements, currentSubset, i + 1, subsets);
            currentSubset.RemoveAt(currentSubset.Count - 1);
        }
    }
}