public static void SolvePartTwo()
{
var clayLocations = GetInput();
var sourceLocation = new XY(500, 0);
var map = new ClayMap(clayLocations);
var streamBuilder = new WaterStreamBuilder(sourceLocation, map);
var stream = streamBuilder.GetStream();
var result = stream.CountStableWater();
result.WriteLine("Day 17, Part 2: ");
}
private static StringBuilder CreateMap(XY sourceLocation, ClayMap clayMap, IDictionary <XY, Water> existingWater)
{
var topBoundary = 0;
var bottomBoundary = clayMap.ClayLocations.MinBy(l => l.Y).Y - 1;
var leftBoundary = clayMap.ClayLocations.MinBy(l => l.X).X - 5;
var rightBoundary = clayMap.ClayLocations.MaxBy(l => l.X).X + 5;
var yLocations = Enumerable.Range(bottomBoundary, topBoundary - bottomBoundary + 1).Reverse();
var xLocations = Enumerable.Range(leftBoundary, rightBoundary - leftBoundary + 1);
var builder = new StringBuilder();
foreach (var y in yLocations)
{
foreach (var x in xLocations)
{
var l = new XY(x, y);
if (clayMap.IsClayAtLocation(l))
{
builder.Append('#');
}
else if (existingWater.ContainsKey(l))
{
if (l == sourceLocation)
{
builder.Append('+');
}
else if (existingWater[l].IsStable)
{
builder.Append('~');
}
else
{
builder.Append('|');
}
}
else
{
builder.Append(' ');
}
}
builder.AppendLine();
}
return(builder);
}
public Water[] SpreadStreamAtLocation(XY location, ClayMap clayMap)
{
var water = GetWater(location);
var directionsToFlow = GetFlowDirections(water.Location, clayMap);
var newAddedWater = new Water[directionsToFlow.Length];
for (var i = 0; i < directionsToFlow.Length; i++)
{
var newWater = water.FlowToDirection(directionsToFlow[i]);
newAddedWater[i] = newWater;
AddWater(newWater);
}
return(newAddedWater);
}
public static void SolvePartOne()
{
var clayLocations = GetInput();
var sourceLocation = new XY(500, 0);
var map = new ClayMap(clayLocations);
var stream = new WaterStreamBuilder(sourceLocation, map);
var water = stream.GetStream();
var result = water.Select(w => w.Location).Count(map.IsInClayArea);
//File.WriteAllText(
// Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "map.txt"),
// CreateMap(sourceLocation, map, water).ToString());
result.WriteLine("Day 17, Part 1: ");
}
private XY[] GetFlowDirections(XY location, ClayMap clayMap)
{
bool CanFlowToLocation(XY loc) => !clayMap.IsClayAtLocation(loc) && !HasWaterAtLocation(loc);
var locationBelow = location + XY.Down;
if (CanFlowToLocation(locationBelow))
{
return(XY.Down.RepeatOnce().ToArray());
}
var isWaterBelow = TryGetWater(locationBelow, out var waterBelow);
if (!isWaterBelow || waterBelow.IsStable)
{
return(Water.GetPossibleFlowDirections()
.Where(d => CanFlowToLocation(location + d))
.ToArray());
}
return(new XY[0]);
}
public WaterStreamBuilder(XY sourceLocation, ClayMap clayMap)
{
this.sourceLocation = sourceLocation;
this.clayMap = clayMap;
}
