Challenge: Equal Points

Lab Java Intermediate 20 points

Write a class Point with x and y and override equals (and hashCode) so points with the same coordinates are equal. Read two points and print same if they are equal, otherwise different.

Input

Four whole numbers: x1 y1 x2 y2.

Output

same or different.

Example

Input

1 2 1 2

Output

same

Sample input available Sample output available

Editor

Java

Hints

The parameter of equals must be Object, not Point.

Use instanceof, then cast to Point.

Solution explanation

With the parameter type Object our method really overrides Object.equals, so it's used everywhere Java compares objects.

Show solution

import java.util.Objects;
import java.util.Scanner;

class Point {
    int x, y;

    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Point)) return false;
        Point p = (Point) o;
        return x == p.x && y == p.y;
    }

    @Override
    public int hashCode() {
        return Objects.hash(x, y);
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Point a = new Point(sc.nextInt(), sc.nextInt());
        Point b = new Point(sc.nextInt(), sc.nextInt());
        System.out.println(a.equals(b) ? "same" : "different");
    }
}

Output

Answer