Решила несколькими способами, результат выдает, но валидатор не принимает... Я что-то в условии не понимаю?
package com.javarush.task.task22.task2207;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
/*
Обращенные слова
*/
public class Solution {
public static List<Pair> result = new LinkedList<>();
public static void main(String[] args) {
try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileInputStream file = new FileInputStream(reader.readLine())) {
byte[] buffer = new byte[file.available()];
file.read(buffer);
String fileString = new String(buffer, "UTF-8");
ArrayList<String> words = new ArrayList<>(Arrays.asList(fileString.split("[ \n]")));
for (int i = 0; i < words.size() - 1; i++) {
String word1 = words.get(i);
for (int j = i + 1; j < words.size(); j++) {
String word2 = words.get(j);
if(word2.equals(new StringBuilder(word1).reverse().toString())) {
Pair pair = new Pair();
pair.first = word1;
pair.second = words.remove(words.indexOf(word2));
result.add(pair);
if (i == words.size() - 2) {
break;
}
}
}
}
for(Pair pair : result) {
System.out.println(pair);
}
}
catch(Exception e) {
System.out.println("Oops! Something went wrong!");
}
}
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;
}
}
}