ZigZag_Print_New

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

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

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

        System.out.println("Enter number of rows!");
        int n = Integer.parseInt(reader.readLine());

        String firstRow = " ";
        String secondRow = " ";
        for (int i = 0; i < n; i++) {
            System.out.println("Enter two numbers!");
            String[] input = reader.readLine().split("\\s+");
            if (i % 2 == 0) {
                firstRow += input[0] + " ";
                secondRow += input[1] + " ";
            } else {
                firstRow += input[1] + " ";
                secondRow += input[0] + " ";
            }
        }
        System.out.println(String.join(" ", firstRow).trim());
        System.out.println(String.join(" ", secondRow).trim());
    }
}