using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] arr = {2,7,11,15};

        int[] resultSet = twoSumValue.twoSum(arr,9);

        Console.WriteLine("First value is  " +resultSet[0]);

        Console.WriteLine("Second value is  " +resultSet[1]);

}

public class twoSumValue 

{

    public static int[] twoSum(int[] arr, int target) {

        int[] result = new int[2];

        Dictionary<int,int> map = new Dictionary<int,int>();

        for(int i=0; i<arr.Length;i++) {

            int key = target - arr[i];

            Console.WriteLine("***************");

            Console.WriteLine(key);

            if(map.ContainsKey(key)){

                Console.WriteLine("I entered here");

                result[1] =  i ;

                result[0] = map[target-arr[i]];

                return result;

            }

            map.Add(arr[i], i  );   

        }

        return result;

    }

}

}