static void Main(string[] args)
{
var lines = File.ReadAllLines("input.txt");
var ascii = AsciiMap.CreateFrom(lines);
var map = ascii.ToAbstractMap(MapItem.FromChar);
var interestPoints = map.Where(item => item.IsDoor || item.IsKey).Select(JustCoords).ToHashSet();
var crossroads = map.Where((col, row, item) => {
if (item.IsWall)
{
return(false);
}
return(map.Neibneighbors(col, row)
.Where(_ => _.item.IsOpen)
.Count() != 2);
}).Select(JustCoords).ToHashSet();
var turns = map.Where((col, row, item) => {
if (item.IsWall)
{
return(false);
}
var neibneighbors = map.Neibneighbors(col, row).Where(_ => _.item.IsOpen).ToList();
if (neibneighbors.Count != 2)
{
return(false);
}
if (neibneighbors[0].col == neibneighbors[1].col)
{
return(false);
}
if (neibneighbors[0].row == neibneighbors[1].row)
{
return(false);
}
return(true);
}).Select(JustCoords).ToHashSet();
var nodes = interestPoints.Union(crossroads).Union(turns);
foreach ((var col, var row) in nodes)
{
ascii[col, row] = 'O';
}
ascii.WriteTo(Console.Out);
(int col, int row) JustCoords((int col, int row, MapItem _) item) => (item.col, item.row);
}
public void CreateFrom_Text_Samples(string text)
{
var map = AsciiMap.CreateFrom(text);
Assert.Equal(text.TrimEnd(), map.ToString().TrimEnd());
}