HackerRank - World sprint #4 - equal stacks

equalStacks_p.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
         string[] tokens_n1 = Console.ReadLine().Split(' ');

            int n1 = Convert.ToInt32(tokens_n1[0]);
            int n2 = Convert.ToInt32(tokens_n1[1]);
            int n3 = Convert.ToInt32(tokens_n1[2]);

            string[] arr1 = Console.ReadLine().Split(' ');
            string[] arr2 = Console.ReadLine().Split(' ');
            string[] arr3 = Console.ReadLine().Split(' ');


            /*
            string[] arr1 = new string[] { "3", "2", "1", "1", "1" };
            string[] arr2 = new string[] { "4", "3", "2" };
            string[] arr3 = new string[] { "1", "1", "4", "1" }; 
            */
            Console.WriteLine(equalStack(arr1, 0, getSum(arr1, 0), arr2, 0, getSum(arr2, 0), arr3, 0, getSum(arr3, 0)));
        }


        public static int equalStack(string[] arr1, int index1, int total1,
            string[] arr2, int index2, int total2,
            string[] arr3, int index3, int total3)
        {
            if ((arr1 == null || index1 == arr1.Length) ||
                (arr2 == null || index2 == arr2.Length) ||
                (arr3 == null || index3 == arr3.Length))
                return 0;           

            while (index1 < arr1.Length &&
                  index2 < arr2.Length &&
                  index3 < arr3.Length
            )
            {
                int sum1 = total1;
                int sum2 = total2;
                int sum3 = total3;

                if (sum1 == sum2 && sum2 == sum3)
                    return sum1;

                int top1 = Convert.ToInt32(arr1[index1]);
                int top2 = Convert.ToInt32(arr2[index2]);
                int top3 = Convert.ToInt32(arr3[index3]);                

                int[] arr = new int[3] { sum1, sum2, sum3 };

                if (maximumNo(arr, 3) == 0)
                {
                    index1++;
                    total1 = total1 - top1;
                }
                else if (maximumNo(arr, 3) == 1)
                {
                    index2++;
                    total2 = total2 - top2;
                }
                else if (maximumNo(arr, 3) == 2)
                {
                    index3++;
                    total3 = total3 - top3;
                }
            }

            return 0; 
        }

        public static int maximumNo(int[] arr, int length)
        {
            int maxIndex = 0;
            for (int i = 1; i < length; i++)
            {
                if (arr[i] > arr[i - 1])
                    maxIndex = i;
            }
            return maxIndex;
        }

        public static int getSum(string[] arr1, int index)
        {
            int sum = 0;
            for (int i = index; i < arr1.Length; i++)
            {
                sum += Convert.ToInt32(arr1[i]);
            }
            return sum;
        }
}