HackerRank Solution: A Very Big Sum Explained Step-by-Step | Partha Kuchana

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 ar) {
// Write your code here
long sum=0;

for (Long value : ar){
sum += value;
}

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 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();
}
}