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  1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStreamReader;
  4. import java.util.Map;
  5. import java.util.HashMap;
  6.  
  7. public class Main {
  8.     private static boolean isLetter(char c) {
  9.         return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
  10.     }
  11.  
  12.     private static void increaseFrequency(Map<String, Integer> words, String currentWord) {
  13.         if (words.containsKey(currentWord)) {
  14.             words.put(currentWord, words.get(currentWord) + 1);
  15.         } else {
  16.             words.put(currentWord, 1);
  17.         }
  18.     }
  19.  
  20.     private static boolean isMoreFrequent(StringBuilder currentWord, StringBuilder recurrentWord, int currentOcurance, int maxOcurance) {
  21.         return (currentOcurance > maxOcurance) || (currentOcurance == maxOcurance && (recurrentWord == null || recurrentWord.compareTo(currentWord) > 0));
  22.     }
  23.  
  24.     private static void updateRecurrentWord(StringBuilder recurrentWord, StringBuilder currentWord, int[] maxOcurance, int currentOcurance) {
  25.         if (isMoreFrequent(currentWord, recurrentWord, currentOcurance, maxOcurance[0])) {
  26.             recurrentWord.replace(0, recurrentWord.length(), currentWord.toString());
  27.             maxOcurance[0] = currentOcurance;
  28.         }
  29.     }
  30.  
  31.     public static String frequestWord(BufferedReader reader) throws IOException {
  32.         Map<String, Integer> words = new HashMap<>();
  33.         StringBuilder recurrentWord = new StringBuilder();
  34.         int[] maxOcurance = new int[1];
  35.         StringBuilder currentWord = new StringBuilder();
  36.         boolean wasLetter = false;
  37.         while (reader.ready()) {
  38.             char letter = (char)reader.read();
  39.             if (isLetter(letter)) {
  40.                 currentWord.append(letter);
  41.                 wasLetter = true;
  42.             } else if (wasLetter) {
  43.                 increaseFrequency(words, currentWord.toString());
  44.                 updateRecurrentWord(recurrentWord, currentWord, maxOcurance, words.get(currentWord.toString()));
  45.                 currentWord = new StringBuilder();
  46.                 wasLetter = false;
  47.             }
  48.         }
  49.  
  50.         return recurrentWord.toString();
  51.     }
  52.  
  53.     public static void main(String[] args) throws IOException {
  54.         BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
  55.         System.out.println(frequestWord(reader));
  56.     }
  57. }
Success #stdin #stdout 0.09s 54688KB
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https://ideone.com/W5amuy
language:
Java (HotSpot 12)
created:
18 hours ago
visibility:
public

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