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

Sparse Arrays

  • danielsson_jacob
     + 0 comments

    My Java solution:

    public static List<Integer> matchingStrings(List<String> stringList, List<String> queries) {
        // Write your code here
        Map<String, Integer> stringCount = new HashMap<>();
        stringList.forEach(entry -> stringCount.compute(entry, (k, v) -> v == null ? 1 : v + 1));
        return queries.stream().map(query -> stringCount.getOrDefault(query, 0)).collect(Collectors.toList());
    }