DaysOfYear, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            foreach(string day in GetDaysOfYear(2020)){
                Console.WriteLine(day);
            }
        }
        
        public static IEnumerable<string> GetDaysOfYear(int year)
        {
            string[] months = new string[]{ "января", "февраля", "марта", "апреля", "мая", "июня", "июля", "августа", "сентября", "октября", "ноября", "декабря"};
            int[] duration = new int[]{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

if(year % 4 == 0){
                duration[1] = 29;
            }

for(int m = 0; m < monthes.Length; m++)
            {
                for(int d = 1; d <= duration[m]; d++)
                {
                    yield return $"{d} {monthes[m]}";
                }
            }
        }
    }
    
    
}

Show compiler warnings [ + ] Show input
Compilation time: 0,3 sec, absolute running time: 0,13 sec, cpu time: 0,08 sec, average memory usage: 20 Mb, average nr of threads: 3, absolute service time: 0,46 sec