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  1. Prepare
  2. Data Structures
  3. Arrays
  4. Sparse Arrays
  5. Discussions

Sparse Arrays

  • solomkinmv
     + 2 comments

    Your solution is very inefficient.

    Here I suggest you functional approach, better efficiency and readability.

    Scanner sc = new Scanner(System.in);

Map<String, Long> counterMap = Stream.generate(sc::next)
    .limit(sc.nextInt())
    .collect(groupingBy(identity(), counting()));

Stream.generate(sc::next)
    .limit(sc.nextInt())
    .map(query -> counterMap.getOrDefault(query, 0L))
    .forEach(System.out::println);

    P.S. imports are omitted.