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

namespace zad_399
{
    class Program
    {
        static void Main(string[] args)
        {
            int n;

            do
            {
                Console.Write("Enter n: ");
                n = int.Parse(Console.ReadLine());
            } while (n > 31 || n <= 0);
            Console.WriteLine();

            double[] A, B, C;
            Console.WriteLine("For station A:\n");
            A = enterValues(n);

            Console.WriteLine("For station B:\n");
            B = enterValues(n);

            Console.WriteLine("For station C:\n");
            C = enterValues(n);

            Console.WriteLine();

            //a
            Console.Write("Days it didnt rain in station A:\n{0} => ", daysItDidntRain(A).Count);
            string daysItDidntRainStr = "";
            foreach (var day in daysItDidntRain(A))
            {
                daysItDidntRainStr += day + ", ";
            }
            if (daysItDidntRainStr.Length <= 0)
            {
                daysItDidntRainStr = "none, ";
            }
            Console.WriteLine(daysItDidntRainStr.Substring(0, daysItDidntRainStr.Length - 2));
            daysItDidntRainStr = "";
            Console.WriteLine();

            //b
            Console.Write("Days it didnt rain in station B:\n{0} => ", daysItDidntRain(B).Count);
            foreach (var day in daysItDidntRain(B))
            {
                daysItDidntRainStr += day + ", ";
            }
            if (daysItDidntRainStr.Length <= 0)
            {
                daysItDidntRainStr = "none, ";
            }
            Console.WriteLine(daysItDidntRainStr.Substring(0, daysItDidntRainStr.Length - 2));
            daysItDidntRainStr = "";
            Console.WriteLine();


            //c
            Console.Write("Days it didnt rain in station C:\n{0} => ", daysItDidntRain(C).Count);
            foreach (var day in daysItDidntRain(C))
            {
                daysItDidntRainStr += day + ", ";
            }
            if (daysItDidntRainStr.Length <= 0)
            {
                daysItDidntRainStr = "none, ";
            }
            Console.WriteLine(daysItDidntRainStr.Substring(0, daysItDidntRainStr.Length - 2));
            Console.WriteLine();

        }

        static List<int> daysItDidntRain(double[] days)
        {
            List<int> daysIndex = new List<int>();
            for (int i = 0; i < days.Length; i++)
            {
                if (days[i] == 0)
                {
                    daysIndex.Add(i + 1);
                }
            }
            return daysIndex;
        }

        static double[] enterValues(int n)
        {
            double[] days = new double[n];
            for (int i = 0; i < n; i++)
            {
                enterValue:
                Console.Write("Enter liters for m2 for day {0}: ", i + 1);
                days[i] = double.Parse(Console.ReadLine());
                if (days[i] < 0)
                {
                    Console.WriteLine("You can't enter negative value!");
                    goto enterValue;
                }
            }

            return days;
        }
    }
}