using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(string.Join(",", TwoSum(new[]{3, 3}, 6)));

    }

​

    public static int[] TwoSum(int[] nums, int target)

    {

        var solution = new int[2];

        var numsTemp = new int[nums.Length];

        Array.Copy(nums, numsTemp, nums.Length);

        for (int index = 0; index < numsTemp.Length; index++)

        {

            int currentNum = numsTemp[index];

            for (int innerIndex = index + 1; innerIndex < numsTemp.Length; innerIndex++)

            {

                if (nums[index] + nums[innerIndex] == target) {

                    solution[0] = index;

                    solution[1] = innerIndex;

                    return solution;

                }

            }

        }

​

        return solution;

    }

}