10. Logs Aggregator

package Uprajnenie;

import java.util.Map;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;

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


        int n = Integer.parseInt(scanner.nextLine());

        Map<String, UserData> userDataMap = new TreeMap<>();

        for (int i = 0; i < n; i++) {
            String[] logData = scanner.nextLine().split(" ");
            String ip = logData[0];
            String user = logData[1];
            int duration = Integer.parseInt(logData[2]);

            if (!userDataMap.containsKey(user)) {
                userDataMap.put(user, new UserData());
            }

            userDataMap.get(user).addSession(ip, duration);
        }

        for (Map.Entry<String, UserData> entry : userDataMap.entrySet()) {
            String user = entry.getKey();
            UserData userData = entry.getValue();

            System.out.printf("%s: %d [%s]%n", user, userData.getTotalDuration(), userData.getUniqueIPs());
        }
    }

    static class UserData {
        private int totalDuration;
        private Set<String> uniqueIPs;

        public UserData() {
            totalDuration = 0;
            uniqueIPs = new TreeSet<>();
        }

        public void addSession(String ip, int duration) {
            totalDuration += duration;
            uniqueIPs.add(ip);
        }

        public int getTotalDuration() {
            return totalDuration;
        }

        public String getUniqueIPs() {
            return String.join(", ", uniqueIPs);
        }
    }
}