TwoSum.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LeetCodeSolutions.LeetCodeProblems
{
    public class TwoSumSolution
    {
        public int[] TwoSum(int[] nums, int target)
        {

            int[] result = new int[2];

            for(int i = 0; i < nums.Length; i++)
            {
                for(var j = i + 1; j < nums.Length; j++)
                {
                    if (nums[i] + nums[j] == target)
                    {
                       result[0] = i;
                       result[1] = j;
                        return result;
                    }
                }
            }

            return result;
        }
}