Couples Frequency

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


public class CouplesFrequency {


    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        String[] inputNums = input.nextLine().split(" ");
        Map<String, Integer> couples = new LinkedHashMap<>();
        for (int i = 0; i < inputNums.length-1; i++){
            String temp = inputNums[i]+" "+inputNums[i+1];
            if (couples.containsKey(temp)){
                //int oldCount = couples.get(temp);
                //couples.put(temp, oldCount+1);
                couples.computeIfPresent(temp, (k, v) -> v + 1);
            }
            else {
                couples.put(temp, 1);
            }
        }
        for(Map.Entry<String,Integer> entry : couples.entrySet()) {
            String key = entry.getKey();
            Integer value = entry.getValue();
            double length = inputNums.length-1;
            double percentage = (value*100)/length;
            System.out.printf("%s -> %.2f%%\n",key,percentage);
        }
    }
}