public int FindLongestPathThroughGrid(string seed, int rows, int cols)
{
MD5 md5Hash = MD5.Create();
StepInGrid firstLocation = new StepInGrid(seed, 0, 0, 0);
_queue.Add(firstLocation);
List <string> AllAnswers = new List <string>();
do
{
// Pop off queue
StepInGrid location = _queue[0];
_queue.RemoveAt(0);
if (location.X == rows && location.Y == cols)
{
AllAnswers.Add(location.CurrentPasscode.Substring(seed.Length));
}
else
{
ProcessOpenings(location, md5Hash, rows, cols);
}
} while (_queue.Any());
var sortedDescending = AllAnswers.OrderByDescending(x => x.Length).ToList();
return(sortedDescending[0].Length);
}
private void ProcessOpenings(StepInGrid location, MD5 md5Hash, int rows, int cols)
{
List <char> openings = OpenDoorsForRoom(location.CurrentPasscode, md5Hash);
if (openings[0] == 'O' && location.X >= 1)
{
StepInGrid north = new StepInGrid(location.CurrentPasscode + 'U', location.X - 1, location.Y, location.Step + 1);
_queue.Add(north);
}
if (openings[3] == 'O' && location.Y < cols)
{
StepInGrid east = new StepInGrid(location.CurrentPasscode + 'R', location.X, location.Y + 1, location.Step + 1);
_queue.Add(east);
}
if (openings[1] == 'O' && location.X < rows)
{
StepInGrid south = new StepInGrid(location.CurrentPasscode + 'D', location.X + 1, location.Y, location.Step + 1);
_queue.Add(south);
}
if (openings[2] == 'O' && location.Y >= 1)
{
StepInGrid west = new StepInGrid(location.CurrentPasscode + 'L', location.X, location.Y - 1, location.Step + 1);
_queue.Add(west);
}
}
public string FindShortestPathThroughGrid(string seed, int rows, int cols)
{
MD5 md5Hash = MD5.Create();
StepInGrid firstLocation = new StepInGrid(seed, 0, 0, 0);
_queue.Add(firstLocation);
do
{
// Pop off queue
StepInGrid location = _queue[0];
_queue.RemoveAt(0);
if (location.X == rows && location.Y == cols)
{
return(location.CurrentPasscode.Substring(seed.Length));
}
ProcessOpenings(location, md5Hash, rows, cols);
} while (1 == 1);
return("");
}
