static void PartTwo(string input)
{
var usedSquares = new List <UsedGridCell>();
for (int j = 0; j < 128; j++)
{
var ba = KnotHash.HashAsBoolArr(input + "-" + j);
for (int i = 0; i < 128; i++)
{
if (ba[i])
{
usedSquares.Add(new UsedGridCell(j, i));
}
}
}
int groupId = 0;
while (usedSquares.Any(s => !s.Visited))
{
usedSquares.First(s => !s.Visited).VisitAdjacent(usedSquares, groupId++);
}
Console.WriteLine("There are " + groupId + " regions present.");
}
static void PartOne(string input)
{
//for (int j = 0; j < 8; j++)
//{
// var ba = KnotHash.HashAsBoolArr(input + "-" + j);
// for (int i = 0; i < 8; i++)
// {
// Console.Write(ba[i] ? '#' : '.');
// }
// Console.WriteLine();
//}
int numUsed = 0;
for (int j = 0; j < 128; j++)
{
var ba = KnotHash.HashAsBoolArr(input + "-" + j);
// Count number of trues, and add to total
numUsed += ba.Count(b => b);
}
Console.WriteLine(numUsed + " squares are used");
}