private void BuildMap()
{
// Create the hasher
KnotHash hasher = new KnotHash();
// Prepare the input
string key = Aoc.Framework.Input.GetString(this);
// Build the map of used cells
int[,] grid = new int[128, 128];
for (int i = 0; i < 128; ++i)
{
string row = key + "-" + i.ToString();
hasher.Compute(row, true);
byte[] hash = hasher.GetBytesHash();
for (int j = 0; j < 128; j++)
{
grid[i, j] = IsUsed(hash, j) ? 0 : -1;
}
}
// Count bits
_bits = 0;
for (int i = 0; i < 128; ++i)
{
for (int j = 0; j < 128; j++)
{
if (grid[i, j] >= 0)
{
_bits++;
}
}
}
// Build groups
_groupId = 1;
for (int i = 0; i < 128; i++)
{
for (int j = 0; j < 128; j++)
{
if (grid[i, j] == 0)
{
BuildGroup(grid, i, j, _groupId++);
}
}
}
}
