PopulationCounter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _14_Populations
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, Dictionary<string, long>> countries = new Dictionary<string, Dictionary<string, long>>();
            while (true)
            {
                string[] input = Console.ReadLine().Split('|');
                if (input[0] == "report")
                {
                    break;
                }
                else
                {
                    string country = input[0];
                    string city = input[1];
                    long people = long.Parse(input[2]);
                    if (countries.ContainsKey(country))
                    {
                        countries[country].Add(city, people);
                    }
                    else
                    {
                        Dictionary<string, long> dictionary = new Dictionary<string, long>();
                        dictionary.Add(city, people);
                        countries.Add(country, dictionary);
                    }
                }
            }
            var orderedDict = countries.OrderByDescending(pair => pair.Value.Values.Sum()).ToDictionary(x => x.Key, x => x.Value);
            foreach (var pair in orderedDict)
            {
                var country = pair.Key;
                var cities = pair.Value;
                var orderedCities = cities
                    .OrderByDescending(x => x.Value)
                    .ToDictionary(x => x.Key, x => x.Value);


                Console.WriteLine($"{country} (total population: {orderedCities.Values.Sum()})");

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