Logs Aggregator

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


public class Task4 {

    private static class Info {
        public int duration;
        public TreeSet<String> IPs;
        public Info(int d, String IP) {
            duration = d;
            IPs = new TreeSet<String>() {{ add(IP); }};
        }
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt(); sc.nextLine();
        String line, IP, name;
        int duration;
        String[] arguments;

        TreeMap<String, Info> data = new TreeMap<>();
        Info temp;

        for (int i = 0; i < n; i++) {
            line = sc.nextLine();
            arguments = line.split(" ");
            IP = arguments[0];
            name = arguments[1];
            duration = Integer.parseInt(arguments[2]);
            if ((temp = data.putIfAbsent(name, new Info(duration, IP))) != null) {
                temp.duration += duration;
                temp.IPs.add(IP);
                data.put(name, temp);
            }
        }

        for (String _name : data.keySet()) {
            temp = data.get(_name);
            System.out.println(_name + ": " + temp.duration + " " + temp.IPs);
        }
    }

}