Couples Frequency

import java.util.LinkedHashMap;
import java.util.Map.Entry;
import java.util.Scanner;


public class CouplesFrequency {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        String sequence = input.nextLine();
        String[] numbers = sequence.split(" ");

        LinkedHashMap<String, Double> map = new LinkedHashMap<String, Double>();

        for (int i = 0; i < numbers.length - 1; i++) {
            String couple = numbers[i] + " " + numbers[i + 1];

            if (!map.containsKey(couple)) {
                map.put(couple, 1.0);
            } else {
                map.put(couple, map.get(couple) + 1.0);
            }
        }

        for (Entry<String, Double> entry : map.entrySet()) {
            System.out.printf("%s -> %.2f%%", entry.getKey(),
                    (entry.getValue() / (numbers.length - 1)) * 100);
            System.out.println();
        }
    }

}