public void ReadInput()
{
var path = Path.Combine(Directory.GetCurrentDirectory(), InputFile);
using (var reader = File.OpenText(path))
{
var line = reader.ReadLine();
while (line is not null)
{
List <int> temp = new List <int>();
foreach (var value in line.ToList())
{
temp.Add(value - '0');
}
HeightMap.Add(new List <int>(temp));
temp.Clear();
line = reader.ReadLine();
}
}
}