PopulationCounter

namespace PopulationCounter
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    public class PopulationCounter
    {
        public static void Main()
        {
            Dictionary<string, Dictionary<string, double>> mydictionary = new Dictionary<string, Dictionary<string, double>>();

            string input = Console.ReadLine();

            while (input != "report")
            {
                string[] inputArguments = input.Split('|');
                string city = inputArguments[0];
                string country = inputArguments[1];
                int population = int.Parse(inputArguments[2]);

                if (!mydictionary.ContainsKey(country))
                {
                    mydictionary.Add(country, new Dictionary<string, double>());
                }

                mydictionary[country].Add(city, population);

                input = Console.ReadLine();
            }

            var orderedCountries = mydictionary.OrderByDescending(x=>x.Value.Values.Sum());

            foreach (var countryName in orderedCountries)
            {
                Console.WriteLine($"{countryName.Key} (total population: {countryName.Value.Sum(x => x.Value)})");

                var orderedCities = countryName.Value.OrderByDescending(x => x.Value);

                foreach (var cityName in orderedCities)
                {
                    Console.WriteLine($"=>{cityName.Key}: {cityName.Value}");
                }
            }
        }
    }
}

//Sofia|Bulgaria|1 000 000
//Veliko Tarnovo|Bulgaria|2 000 000
//London|UK|4 000 000
//Rome|Italy|3 000 000
//report