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using System;
namespace aoc2019
{
class Program
{
static void Main(string[] args)
{
if (args.Length == 1 && int.TryParse(args[0], out int daynum))
{
if (daynum >= 0 && daynum <= 25)
{
Day day = DayFactory.GetDay(daynum);
day.AllParts();
}
else
{
Console.WriteLine($"{daynum} is an invalid day");
return;
}
}
else
{
for (var i = 1; i <= 25; ++i)
{
var day = DayFactory.GetDay(i);
if (day == null) continue;
Console.WriteLine($"Day {i}:");
day.AllParts();
}
}
}
}
}
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