GaussTrick

package ListsLab;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;


public class GaussTrick {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        List<Integer> num = Arrays.stream(reader.readLine().split(" "))
                .map(Integer::parseInt).collect(Collectors.toList());

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

        while (num.size() > 0) {
            if (num.size() % 2 == 0) {
                int sum = 0;
                sum = num.get(0) + num.get(num.size() - 1);
                numbersOfSum.add(sum);
                num.remove(0);
                num.remove(num.size() - 1);
            } else {
                while (num.size() > 1){
                    int sum = 0;
                    sum = num.get(0) + num.get(num.size() - 1);
                    numbersOfSum.add(sum);
                    num.remove(0);
                    num.remove(num.size() - 1);
                }
                break;

            }
        }
        for (Integer integer : numbersOfSum) {
            System.out.print(integer + " ");

        }

    }
}