When I check at Intelij that the output is the same as required but the validation is failed. I don't know why. Maybe someone has the idea why?
package com.codegym.task.task22.task2207;
import java.io.*;
import java.util.*;
/*
Inverted words
*/
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 st = reader.readLine();
List<String> list = new LinkedList<>();
HashSet<String> set = new HashSet<>();
LinkedHashMap<String, String> map = new LinkedHashMap<>();
list = Arrays.asList(st.split(" "));
for (String s : list) {
set.add(s);
}
for (int i = 1; i < list.size(); i++) {
String m = list.get(i);
StringBuilder rev = new StringBuilder(m);
rev = rev.reverse();
String revStr = rev.toString();
for (int j = 0; j < list.size(); j++) {
if (list.get(j).equals(revStr) && !list.get(j).equals("")) {
map.put(m, revStr);
list.set(j, "");
list.set(i, "");
}
}
}
for (Map.Entry<String, String> pairs : map.entrySet()) {
String key = pairs.getKey();
String value = pairs.getValue();
result.add(new Pair(key, value));
}
for (Pair listForOf : result)
System.out.println(listForOf);
}
public static class Pair {
String first;
String second;
public Pair() {
}
public Pair(String first, String second) {
this.first = first;
this.second = 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;
}
}
}