JimAndTheOrders.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.Map.Entry;
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 {

	//https://www.hackerrank.com/challenges/jim-and-the-orders
    /*
     * Complete the 'jimOrders' function below.
     *
     * The function is expected to return an INTEGER_ARRAY.
     * The function accepts 2D_INTEGER_ARRAY orders as parameter.
     */

    public static List<Integer> jimOrders(List<List<Integer>> orders) {
    // Write your code here
    	List<Integer> orderList = new ArrayList<Integer>();
    	Iterator<List<Integer>> orderIterator = orders.iterator();
    	Map<Integer,Integer> map = new LinkedHashMap<Integer, Integer>();
    	int iteratorNum = 1;
    	while(orderIterator.hasNext()) {
    		List<Integer> listPoint = orderIterator.next();
//    		orderList.add(listPoint.get(0) + listPoint.get(1));  
    		map.put(iteratorNum, listPoint.get(0) + listPoint.get(1)); 
    		iteratorNum++;
    	}
    	
    	map = sortByValue(map);
    	
    	
    	orderList.addAll(map.keySet());
    	
    	return orderList;
    }
    
    public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
        List<Entry<K, V>> list = new ArrayList<>(map.entrySet());
        list.sort(Entry.comparingByValue());

        Map<K, V> result = new LinkedHashMap<>();
        for (Entry<K, V> entry : list) {
            result.put(entry.getKey(), entry.getValue());
        }

        return result;
    }

}

public class JimAndTheOrders {
    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 n = Integer.parseInt(bufferedReader.readLine().trim());

        List<List<Integer>> orders = new ArrayList<>();

        IntStream.range(0, n).forEach(i -> {
            try {
                orders.add(
                    Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
                        .map(Integer::parseInt)
                        .collect(toList())
                );
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        });

        List<Integer> result = Result.jimOrders(orders);

        bufferedWriter.write(
            result.stream()
                .map(Object::toString)
                .collect(joining(" "))
            + "\n"
        );

        bufferedReader.close();
        bufferedWriter.close();
    }
}