Srbsko Unleashed

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;

public class test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        LinkedHashMap<String, LinkedHashMap<String, Integer>> venues = new LinkedHashMap<>();
        while (true) {
            String line = scanner.nextLine();

            if ("End".equals(line)) {
                break;
            }

            String[] tokens = line.split(" @");
            if (tokens.length != 2)
                continue;

            String singerName = tokens[0];
            String[] venueAndTicketTokens = tokens[1].split(" ");

            if (venueAndTicketTokens.length < 3) //venue name + ticket price + ticket count -> minimum 3 elements
                continue;

            int ticketCount = validateNumber(venueAndTicketTokens[venueAndTicketTokens.length - 1]);
            int ticketPrice = validateNumber(venueAndTicketTokens[venueAndTicketTokens.length - 2]);

            if (ticketCount == -1 || ticketPrice == -1)
                continue;

            String venueName = getVenueName(venueAndTicketTokens);

            venues.putIfAbsent(venueName, new LinkedHashMap<>());
            venues.get(venueName).putIfAbsent(singerName, 0);

            int currentSum = ticketCount * ticketPrice;
            venues.get(venueName).put(singerName, venues.get(venueName).get(singerName) + currentSum);
        }

        for (Map.Entry<String, LinkedHashMap<String, Integer>> entry : venues.entrySet()) {
            System.out.println(entry.getKey());
            entry.getValue()
                    .entrySet()
                    .stream()
                    .sorted((s1, s2) -> s2.getValue().compareTo(s1.getValue()))
                    .forEach(s -> System.out.printf("#  %s -> %d%n", s.getKey(), s.getValue()));
        }
    }

    private static String getVenueName(String[] venueAndTicketTokens) {
        String result = "";

        for (int i = 0; i < venueAndTicketTokens.length - 2; i++) {
            result += venueAndTicketTokens[i] + " ";
        }

        return result.trim();
    }

    private static int validateNumber(String element) {
        int number = -1;

        try {
            number = Integer.parseInt(element);
        } catch (NumberFormatException ignored) {
        }

        return number;
    }

}