// list - для загрузки всех слов из файла
List<String> list = new ArrayList<>();
// list1 - для хранения слов, которые уже были добавлены в result
List<String> list1 = new ArrayList<>();
package com.javarush.task.task22.task2207;
import java.io.*;
import java.nio.file.FileVisitResult;
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) throws IOException {
List<String> list = new ArrayList<>();
List<String> list1 = new ArrayList<>();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName = reader.readLine();
FileReader fileReader = new FileReader(fileName);
reader = new BufferedReader(fileReader);
while (reader.ready()) {
String s = reader.readLine();
String[] arr = s.split(" ");
for (int i = 0; i < arr.length; i++) {
list.add(arr[i]);
}
}
fileReader.close();
for (int i = 0; i < list.size() - 1; i++) {
for (int j = i + 1; j < list.size(); j++) {
// StringBuilder stringBuilder = new StringBuilder(list.get(j)).reverse();
if (list.get(i).equals(new StringBuilder(list.get(j)).reverse().toString())) {
if (list1.contains(list.get(i)) == false) {
list1.add(list.get(i));
Pair pair = new Pair();
pair.first = list.get(i);
pair.second = list.get(j);
result.add(pair);
} else {
list.remove(j);
j--;
}
}
}
}
for (Pair pair : result) {
System.out.println(pair.toString());
}
}
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;
}
}
}