[해커랭크] A Very Big Sum

https://www.hackerrank.com/challenges/a-very-big-sum/problem?isFullScreen=true

A Very Big Sum | HackerRank

In this challenge, you need to calculate and print the sum of elements in an array, considering that some integers may be very large.

Function Description

Complete the  function with the following parameter(s):

• : an array of integers

Return

• : the sum of the array elements

Input Format

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

Output Format

Return the integer sum of the elements in the array.

Constraints

Sample Input

STDIN                                                   Function
-----                                                   --------
5                                                       arr[] size n = 5
1000000001 1000000002 1000000003 1000000004 1000000005  arr[...]  

Output

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 int C/C++/Java to store such sums.

 

 

import java.io.*;

import java.math.*;

import java.security.*;

import java.text.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.function.*;

import java.util.regex.*;

import java.util.stream.*;

import static java.util.stream.Collectors.joining;

import static java.util.stream.Collectors.toList;

class Result {

    /*

     * Complete the 'aVeryBigSum' function below.

     *

     * The function is expected to return a LONG_INTEGER.

     * The function accepts LONG_INTEGER_ARRAY ar as parameter.

     */

    public static long aVeryBigSum(List<Long> ar) {

    // Write your code here

        Long sum = 0L;

        for(Long num : ar){

            sum += num;

        }

        return sum;

    }

}

public class Solution {

    public static void main(String[] args) throws IOException {

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int arCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<Long> ar = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))

            .map(Long::parseLong)

            .collect(toList());

        long result = Result.aVeryBigSum(ar);

        bufferedWriter.write(String.valueOf(result));

        bufferedWriter.newLine();

        bufferedReader.close();

        bufferedWriter.close();

    }

}