Почему не проходит?
package com.javarush.task.task22.task2207;
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 file = reader.readLine();
BufferedReader rd = new BufferedReader(new FileReader(file));
String s = "";
ArrayList<String> list = new ArrayList<>();
while(rd.ready()){s+=rd.readLine()+" ";}
reader.close();
s = s.trim();
rd.close();
Map<String, String> map = new HashMap<>();
String[] all = s.split(" ");
for(int i = 0;i<all.length;i++){
map.put(all[i],all[i]);
}
for(Map.Entry pi : map.entrySet()){
list.add((String) pi.getKey());
}
for(Map.Entry pi : map.entrySet()) {
String f =(String) pi.getKey();
String rf = new StringBuilder(f).reverse().toString();
for(int i = 0;i<list.size();i++){
if(list.get(i).equals(rf)){
Pair ir = new Pair();
ir.first = f;
ir.second = rf;
result.add(ir);
}
}
list.remove(f);
list.remove(rf);
}
}
public static class Pair {
String first;
String 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 :
second == null ? first :
first.compareTo(second) < 0 ? first + " " + second : second + " " + first;
}
}
}