Проверяла на примере из условия - все сходится, а проверку не проходит
package com.javarush.task.task22.task2207;
import java.util.LinkedList;
import java.util.*;
import java.io.*;
/*
Обращенные слова
*/
public class Solution {
public static List<Pair> result = new LinkedList<>();
public static void main(String[] args) throws IOException{
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName = reader.readLine();
reader.close();
Scanner in = new Scanner(fileName);
List<String> words = new ArrayList<String>();
while (in.hasNext()) {
words.add(in.next());
}
int count = 0;
Iterator<String> iterator = words.iterator();
HashMap<String, Integer> map = new LinkedHashMap<String, Integer>();
while (iterator.hasNext()) {
String s = iterator.next();
if (!(s.equals((new StringBuilder(s)).reverse().toString()))) {
if (words.contains((new StringBuilder(s)).reverse().toString())) {
result.add(new Pair(s, (new StringBuilder(s)).reverse().toString()));
}
} else {
for (String st : words) {
if (st.equals(s)) count++;
}
if (!(map.containsKey(s))) map.put(s, count);
count = 0;
}
iterator.remove();
}
for (Map.Entry<String, Integer> pair : map.entrySet()) {
String key = pair.getKey();
Integer value = pair.getValue();
for (int i = 0; i < value/2; i++) {
result.add(new Pair(key, key));
}
}
}
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;
}
}
}