Подскажите пожалуйста, что я пропустил. Проверял на тексте из примера, вывод соответствует
package com.javarush.task.task22.task2207;
import java.io.*;
import java.nio.charset.Charset;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/*
Обращенные слова
*/
public class Solution {
public static List<Pair> result = new LinkedList<>();
public static void main(String[] args) throws IOException {
BufferedReader fileNameReader = new BufferedReader(new InputStreamReader(System.in));
String fileName = fileNameReader.readLine();
fileNameReader.close();
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(fileName), "utf-8"));
Set<String> set = new TreeSet<>();
while(reader.ready()) {
Pattern p = Pattern.compile("[а-яА-Я]+");
Matcher m = p.matcher(reader.readLine());
while(m.find()) {
String next = m.group();
String nextReversed = new StringBuilder().append(next).reverse().toString();
if (set.contains(new StringBuilder().append(next).reverse().toString())) {
if (!result.contains(new Pair(nextReversed, next)))
result.add(new Pair(nextReversed, next));
} else {
set.add(next);
}
}
}
for (Pair pair : result) {
System.out.println(pair.first + " " + pair.second);
}
}
public static class Pair {
String first;
String second;
public Pair() {
}
public Pair(String first, String second) {
this.first = first;
this.second = second;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Pair pair = (Pair) o;
if (first != null ? !first.equals(pair.first) : pair.first != null) return false;
return second != null ? second.equals(pair.second) : pair.second == null;
}
@Override
public int hashCode() {
int result = first != null ? first.hashCode() : 0;
result = 31 * result + (second != null ? second.hashCode() : 0);
return result;
}
@Override
public String toString() {
return first == null && second == null ? "" :
first == null && second != null ? second :
second == null && first != null ? first :
first.compareTo(second) < 0 ? first + " " + second : second + " " + first;
}
}
}