using System;

using System.Collections;

​

public class Program

{

    public void SubArray(int[] arr)

    {

        Hashtable sum = new Hashtable();

        int[] su = new int[arr.Length];

        int s = 0;

        int count = 0;

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

        {

            s = s + arr[i];

            su[i] = s;

            if (s == 0)

            {

                count++;

            }

​

            if (sum.ContainsKey(s))

            {

                count = count + Convert.ToInt32(sum[s]);

                sum[s] = Convert.ToInt32(sum[s]) + 1;

            }

            else

            {

                sum.Add(s, 1);

            }

        }

​

        Console.WriteLine(count);

    }

​

    public static void Main()

    {

        int[] arr = new int[]

        {

            6,

            -1,

            -3,

            4,

            -2,

            2,

            4,

            6,

            -12,

            -7

        };

        Program p = new Program();

        p.SubArray(arr);

    }

}