вроде работает как надо
package com.javarush.task.task22.task2207;
import java.io.*;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
/*
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();//"D:\\JavaTest\\123.txt";//
ArrayList<String> list = new ArrayList<String>();
BufferedReader br = new BufferedReader (new FileReader(file));
String line;
int count=0;
while(( line = br.readLine()) != null){
String d[]=line.split(" +");
for(int i=0;i<d.length;i++){
if (count ==0 && i==0){
d[i]=d[i].substring(1);
count++;
}
list.add(d[i]);
}
}
for(int i=0;i<list.size();i++){
for(int j=i+1;j<list.size();j++){
StringBuilder s= new StringBuilder(list.get(j));
s=s.reverse();
String ss=s.toString();
// System.out.println(ss+" "+list.get(i)+" "+list.get(i).equals(ss));
if (list.get(i).equals(ss)){
// System.out.println(i+" "+j);
Pair pair = new Pair();
pair.first=list.get(i);
pair.second=list.get(j);
if(list.size()>0)list.remove(i);else break;
if(list.size()>0) list.remove(j-1);else break;
i--;
result.add(pair);
break;
}
}
}
for(int i=0;i<result.size();i++){
System.out.println(result.get(i));
}
}
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 != null ? second :
second == null && first != null ? first :
first.compareTo(second) < 0 ? first + " " + second : second + " " + first;
}
}
}