Создаю и тестирую текстовики через идею, бом символы исключены
package com.javarush.task.task22.task2207;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
/*
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 FileReader(new BufferedReader(new InputStreamReader(System.in)).readLine()));
ArrayList<String> array = new ArrayList<>();
while (reader.ready()) {
array.addAll(Arrays.asList(reader.readLine().split(" ")));
}
for (int i = 1; i < array.size(); i++) {
String firstWord = array.get(i-1);
String secondWord = array.get(i);
if (firstWord.equals(new StringBuilder(secondWord).reverse().toString())) {
Pair p = new Pair();
p.first = firstWord;
p.second = secondWord;
array.remove(i-1);
array.remove(i-1);
i = 0;
result.add(p);
}
}
}
public static class Pair {
String first;
String second;
public Pair() {
}
@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;
}
}
}