private static int GetManhattanDistanceFromOneDIndex(Tuple <int, int> rcconfig, int index_a, int index_b)
{
Tuple <int, int> twod_index_a = HFunctions.OneDIndexToTwoDIndex(rcconfig, index_a);
Tuple <int, int> twod_index_b = HFunctions.OneDIndexToTwoDIndex(rcconfig, index_b);
int manhattan_dist = HFunctions.GetManhattanDistanceFromTwoDIndex(twod_index_a, twod_index_b);
return(manhattan_dist);
}
public static int MidRowManhattan(State s) //not admissable
{
int current_heuristic_value = 0;
//int number_of_asymmetry_pairs = 0;
int number_of_row = State.smRowColumnConfig.Item1;
int number_of_column = State.smRowColumnConfig.Item2;
int offset_first_row_last_row = (number_of_row - 1) * number_of_column;
int first_index_mid_row = ((number_of_row - 1) / 2) * number_of_column;
int last_index_mid_row = first_index_mid_row + number_of_column - 1;
//SortedSet<int> records_used_indexed_for_manhattan_dist = new SortedSet<int>();
for (int i = 0; i < number_of_column; i++)
{
int index_chip_top_row = i;
int index_chip_bottom_row = i + offset_first_row_last_row;
if (s.InnerChipsList[index_chip_top_row] != s.InnerChipsList[index_chip_bottom_row])
{
//number_of_asymmetry_pairs++;
int smallest_dist_of_bottomOrtop_mid_chips = int.MaxValue;
for (int j = first_index_mid_row; j <= last_index_mid_row; j++)
{
int index_chip_mid_row = j;
if (s.InnerChipsList[index_chip_top_row] == s.InnerChipsList[index_chip_mid_row])
{
//calculate bottom_mid distance when top == mid
int current_dist_of_bottom_mid_chips = HFunctions.GetManhattanDistanceFromOneDIndex(State.smRowColumnConfig, index_chip_bottom_row, index_chip_mid_row);
if (current_dist_of_bottom_mid_chips < smallest_dist_of_bottomOrtop_mid_chips)
{
smallest_dist_of_bottomOrtop_mid_chips = current_dist_of_bottom_mid_chips;
}
}
if (s.InnerChipsList[index_chip_bottom_row] == s.InnerChipsList[index_chip_mid_row])
{
//calculate top_mid distance when bottom == mid
int current_dist_of_top_mid_chips = HFunctions.GetManhattanDistanceFromOneDIndex(State.smRowColumnConfig, index_chip_top_row, index_chip_mid_row);
if (current_dist_of_top_mid_chips < smallest_dist_of_bottomOrtop_mid_chips)
{
smallest_dist_of_bottomOrtop_mid_chips = current_dist_of_top_mid_chips;
}
}
}
if (smallest_dist_of_bottomOrtop_mid_chips < int.MaxValue)
{
current_heuristic_value += (smallest_dist_of_bottomOrtop_mid_chips);
}
else
{
current_heuristic_value += 4; //which number is appropriate?
}
}
}
//int final_heuristic_value = (int)(((double)number_of_asymmetry_pairs / (double)State.smRowColumnConfig.Item2) * (double)current_heuristic_value);
return(current_heuristic_value);
}