treemapUse.java

	

    import java.util.Scanner;
    import java.util.TreeMap;
     
    public class LogsAggregator {
     
            public static void main(String[] args) {
     
                    Scanner input = new Scanner(System.in);
                    int n = input.nextInt();
                    input.nextLine();
                    TreeMap<String, TreeMap<String, Integer>> allUsers = new TreeMap<>();
                    // fill map with ips,names,duration of all inputLines
                    for (int i = 0; i < n; i++) {
                            String[] inputLine = input.nextLine().split(" ");
                            String ip = inputLine[0];
                            String name = inputLine[1];
                            int duration = Integer.parseInt(inputLine[2]);
                            if (!allUsers.containsKey(name)) {
                                    allUsers.put(name, new TreeMap<>());
                                    allUsers.get(name).put(ip, duration);
                            } else if (allUsers.get(name).containsKey(ip)) {
                                    int currentDuration = allUsers.get(name).get(ip);
                                    allUsers.get(name).put(ip, currentDuration + duration);
     
                            } else {
                                    allUsers.get(name).put(ip, duration);
                            }
                    }
                    // print user-duration-ips
                    for (String user : allUsers.keySet()) {
                            System.out.print(user + ": ");
                            int allMinutes = 0;
     
                            for (String ip : allUsers.get(user).keySet()) {
                                    allMinutes += allUsers.get(user).get(ip);
                            }
                            System.out.print(allMinutes + " ");
                            System.out.print(allUsers.get(user).keySet());
                            System.out.println();
                    }
                    input.close();
            }
    }