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  1. import java.io.BufferedReader;
  2. import java.io.InputStreamReader;
  3. import java.io.IOException;
  4. import java.util.Set;
  5. import java.util.TreeSet;
  6.  
  7. public class Main {
  8.     public static void main(String[] args) throws IOException {
  9.         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  10.         String currentMovie = null;
  11.         Set<String> tagsSet = new TreeSet<>();
  12.         String line;
  13.  
  14.         while ((line = br.readLine()) != null) {
  15.             line = line.trim();
  16.             if (line.isEmpty()) continue;
  17.  
  18.             String[] parts = line.split("\t", 2);
  19.             String movieId = parts[0];
  20.             String tag = parts[1];
  21.  
  22.             if (!movieId.equals(currentMovie)) {
  23.                 if (currentMovie != null) {
  24.                     System.out.println(currentMovie + "\t" + String.join(",", tagsSet));
  25.                 }
  26.                 currentMovie = movieId;
  27.                 tagsSet.clear();
  28.             }
  29.             tagsSet.add(tag);
  30.         }
  31.         if (currentMovie != null) {
  32.             System.out.println(currentMovie + "\t" + String.join(",", tagsSet));
  33.         }
  34.     }
  35. }
  36.  
Success #stdin #stdout 0.09s 54988KB
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https://ideone.com/oZEAlX
language:
Java (HotSpot 12)
created:
6 days ago
visibility:
public

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