?

package com.javarush.task.task22.task2209; import java.io.*; import java.util.ArrayList; import java.util.List; import java.util.StringTokenizer; /* Составить цепочку слов */ public class Solution { public static void main(String[] args) throws Exception { StringBuilder sb = new StringBuilder(); try { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); BufferedReader fileReader = new BufferedReader(new FileReader(reader.readLine())); String string; while((string = fileReader.readLine()) != null) { sb.append(string.trim()); } } catch (IOException e) { e.printStackTrace(); } StringBuilder result = getLine(sb.toString().trim().split(" ")); System.out.println(result.toString()); } public static StringBuilder getLine(String... words) { StringBuilder stringBuilder = new StringBuilder(); ArrayList<String> arrayList = new ArrayList<>(); for (String string : words) { arrayList.add(string); } int index = 0; for (int j = 0; j < arrayList.size(); j++) { boolean b = false; for (int i = 0; i < arrayList.size(); i++) { b = (arrayList.get(j).substring(0, 1).equals(arrayList.get(i).substring(arrayList.get(i).length()-1))&&i!=j); index = j; if (b) break; } if (!b) break; } stringBuilder.append(arrayList.get(index)); ArrayList <String> arrayList1 = (ArrayList<String>) arrayList.clone(); for (int i = 0; 1 < arrayList.size();) { for (int j = 0; j < arrayList1.size(); j++) { String s = String.valueOf(stringBuilder); String s1 = s.toUpperCase(); if (s.endsWith(String.valueOf(arrayList1.get(j).charAt(0)))||s1.endsWith(String.valueOf(arrayList1.get(j).charAt(0)))) { stringBuilder.append(" ").append(arrayList1.get(j)); i = j; arrayList.remove(i); arrayList1.remove(j); break; } } } // String s = String.valueOf(stringBuilder); // String[] strings = s.split(" "); // strings[strings.length-1] = ""; // stringBuilder = strings; return stringBuilder; } }