AVeryBigSum.cs

// Calculate and print the sum of the elements in an array, keeping in mind that some of those integers may be quite large.

// Function Description

// Complete the function aVeryBigSum described below to return the sum of all elements of the array.

// aVeryBigSum(integer: n, integer: arr_size, integer array: arr)
// Parameters:
// n: array size
// arr_size: array size
// ar: array of integers to sum
// Returns: integer sum of all array elements
// Constraints

// Raw Input Format

// The first line of the input consists of an integer . 
// The next line contains  space-separated integers contained in the array.

// Sample Input 0

// 5
// 1000000001 1000000002 1000000003 1000000004 1000000005
// Sample Output 0

// 5000000015
// Note:

// The range of the 32-bit integer is .
// When we add several integer values, the resulting sum might exceed the above range. You might need to use long long int in C/C++ or long data type in Java to store such sums.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Solution {

    /*
     * Complete the aVeryBigSum function below.
     */
    static long aVeryBigSum(int n, long[] ar) {
        /*
         * Write your code here.
         */
        long sum = 0;     
                      
        foreach (var element in ar) {
            Console.Out.WriteLine(element);
            sum += element;
        }
        
        return sum;
    }

    static void Main(string[] args) {
        TextWriter tw = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        int n = Convert.ToInt32(Console.ReadLine());

        long[] ar = Array.ConvertAll(Console.ReadLine().Split(' '), arTemp => Convert.ToInt64(arTemp))
        ;
        long result = aVeryBigSum(n, ar);

        tw.WriteLine(result);

        tw.Flush();
        tw.Close();
    }
}