Sorting

public class Pair implements Comparable<Pair> {
    private int a, b;
    public Pair(int x, int y) { a = x; b = y; }
    public int compareTo(Pair other) {
        if (this.a != other.a) return this.a - other.a;
        return this.b - other.b;
    }
    public int getA() { return a; }
    public int getB() { return b; }
}
// Usage:
Pair p = new Pair(2, 5);
Pair q = new Pair(2, 3);
System.out.print(p.compareTo(q) > 0);

• A

  Compile error

• B

  true

  check_circle
• C

  false

• D

  0