VectorExample

VectorExample.java

import java.util.Scanner;  // Import the Scanner class
import java.util.Vector; // import the ArrayList class
import java.util.Collections;


public class VectorExample {
  public static class Pair {
    private int first;
    private int second;;

    public Pair(int first, int second) {
      this.first = first;
      this.second = second;
    }

    public int  first() {return this.first;}
    public int second() {return this.second;}
  }

  public static void main(String[] args){
    int n, buff1, buff2;

    Scanner scanner = new Scanner(System.in);  // Create a Scanner object
    Vector<Pair> vec = new Vector<Pair>();

    n = scanner.nextInt();
    for(int i=0; i<n; i++) {
      buff1 = scanner.nextInt();
      buff2 = scanner.nextInt();

      Pair tmp = new Pair(buff1, buff2);

      vec.add(tmp);
    }

    Collections.sort(vec, (a, b) -> {
      int sum_a = a.first() + a.second();
      int sum_b = b.first() + b.second();
      return sum_b - sum_a;
    });

    for(int i=0; i<n; i++) {
      Pair tmp = vec.get(i);
      System.out.println(tmp.first + " " + tmp.second);
    }
  }
}