programmers42576.java

package Programmers;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.StringTokenizer;

public class programmers42576 {
 public static void main(String[] args) throws IOException {
 BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
 StringTokenizer stringTokenizer = new StringTokenizer(in.readLine(), ", ");
 String[] participant = new String[stringTokenizer.countTokens()];
 int i = 0;
 /*
 input case1
 "leo", "kiki", "eden"
 "eden", "kiki"

 input case2
 "mislav", "stanko", "mislav", "ana"
 "stanko", "ana", "mislav"
 */
 while (stringTokenizer.hasMoreTokens()) {
 participant[i] = stringTokenizer.nextToken();
 participant[i] = participant[i].substring(1, participant[i].length() - 1);
 i++;
 }
 stringTokenizer = new StringTokenizer(in.readLine(), ",");
 String[] completion = new String[stringTokenizer.countTokens()];
 i = 0;

 while (stringTokenizer.hasMoreTokens()) {
 completion[i] = stringTokenizer.nextToken();
 completion[i] = completion[i].substring(1, completion[i].length() - 1);
 i++;
 }

 Solution42576 sc = new Solution42576();
 System.out.println(sc.solution(participant, completion));
 }
}

class Solution42576 {
 public String solution(String[] participant, String[] completion) {
 String answer = "";
 HashMap<String, Integer> hm = new HashMap<>();
 for (String player : participant)
 hm.put(player, hm.getOrDefault(player, 0) + 1);
 for (String player : completion)
 hm.put(player, hm.get(player) - 1);
 for (String key : hm.keySet()) {
 if (hm.get(key) != 0) {
 answer = key;
 System.out.println(answer);
 break;
 }
 }
 return answer;

 }
}