Triangle Classifier

Lab Java Intermediate 20 points

Read three side lengths. Print invalid if they can't form a triangle, otherwise equilateral, isosceles or scalene.

Input

Three positive integers.

Output

One word.

Example

Input

3 3 3

Output

equilateral

Sample input available Sample output available

Editor

Java

Hints

Sort the sides so the longest is last.

Valid if the two shorter sides add up to more than the longest.

Solution explanation

Sorting removes the need to check every arrangement of the sides.

Show solution

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] s = {sc.nextInt(), sc.nextInt(), sc.nextInt()};
        Arrays.sort(s);
        if (s[0] + s[1] <= s[2]) {
            System.out.println("invalid");
        } else if (s[0] == s[2]) {
            System.out.println("equilateral");
        } else if (s[0] == s[1] || s[1] == s[2]) {
            System.out.println("isosceles");
        } else {
            System.out.println("scalene");
        }
    }
}

Output

Answer