No java ! here is my code golf version var map = new BufferedReader(new InputStreamReader(in, UTF_8)) .lines() .flatMap(compile(" "

No java ! here is my code golf version var map = new BufferedReader(new InputStreamReader(in, UTF_8)) .lines() .flatMap(compile(" ")::splitAsStream) .collect(groupingBy(w -> w, () -> new TreeMap<>(reverseOrder()), counting())); It obviously doesn't work without the imports import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.TreeMap; import static java.lang.System.in; import static java.nio.charset.StandardCharsets.UTF_8; import static java.util.Collections.reverseOrder; import static java.util.regex.Pattern.compile; import static java.util.stream.Collectors.counting; import static java.util.stream.Collectors.groupingBy;