private int Searching(List <PairWithIndex> cats,
List <PairWithIndex> mice,
List <Pair> cheeses,
out List <List <Pair> > catsPath,
out List <List <Pair> > micePath,
SearchRule rule)
{
// initialize
int count = 0;
int height = board.GetLength(0);
int width = board.GetLength(1);
BoardState current = new BoardState(null, new List <BoardState>(), cats, mice, cheeses);
current.Gn = 0;
current.Hn = 0;
List <BoardState> searchList = new List <BoardState>();
searchList.Add(current);
BoardState checkBoard;
micePath = new List <List <Pair> >();
catsPath = new List <List <Pair> >();
while (searchList.Count > 0)
{
count++;
if (searchRule == SearchRule.AStar1 || searchRule == SearchRule.AStar2 || searchRule == SearchRule.AStar3)
{
searchList.Sort(new myComparer());
}
checkBoard = searchList[0];
searchList.Remove(searchList[0]);
// check cheeses
List <Pair> currentCheeses;
int cheesesNum = CheckCheeses(checkBoard.mice, checkBoard.cheeses, out currentCheeses);
if (cheesesNum == 0)
{
continue;
}
// check mice
List <PairWithIndex> currentMice;
int miceNum = CheckMice(checkBoard.mice, checkBoard.cats, checkBoard, out currentMice, micePath);
if (miceNum == 0)
{
for (int i = 0; i < checkBoard.cats.Count; i++)
{
List <Pair> catPath = new List <Pair>();
BoardState temp = checkBoard;
int index = checkBoard.cats[i].index;
while (temp.parent != null)
{
for (int k = 0; k < temp.cats.Count; k++)
{
if (temp.cats[k].index == index)
{
catPath.Insert(0, temp.cats[k].p);
break;
}
}
temp = temp.parent;
}
catsPath.Add(catPath);
}
break;
}
// mice move, only one possibility
List <PairWithIndex> miceMove = new List <PairWithIndex>();
for (int i = 0; i < currentMice.Count; i++)
{
// mice's next step
Pair p = Mouse.NextStep(currentMice[i].p, currentCheeses, width, height);
int index = currentMice[i].index;
PairWithIndex nextStep = new PairWithIndex(p, index);
miceMove.Add(nextStep);
}
// cats move, expand all possible states
List <List <PairWithIndex> > catsCandidateSet = new List <List <PairWithIndex> >();
for (int i = 0; i < checkBoard.cats.Count; i++)
{
List <PairWithIndex> oneCatMove = new List <PairWithIndex>();
List <Pair> candidates = Cat.FindCandidates(checkBoard.cats[i].p, board);
for (int j = 0; j < candidates.Count; j++)
{
Pair p = candidates[j];
int index = checkBoard.cats[i].index;
oneCatMove.Add(new PairWithIndex(p, index));
}
catsCandidateSet.Add(oneCatMove);
}
List <List <PairWithIndex> > catsMove = new List <List <PairWithIndex> >();
Expand(catsMove, catsCandidateSet, new List <PairWithIndex>(), 0);
switch (searchRule)
{
case SearchRule.DFS:
DFS(searchList, checkBoard, catsMove, miceMove, currentCheeses);
break;
case SearchRule.BFS:
BFS(searchList, checkBoard, catsMove, miceMove, currentCheeses);
break;
case SearchRule.AStar1:
AStar1(searchList, checkBoard, catsMove, miceMove, currentCheeses);
break;
case SearchRule.AStar2:
AStar2(searchList, checkBoard, catsMove, miceMove, currentCheeses);
break;
case SearchRule.AStar3:
AStar3(searchList, checkBoard, catsMove, miceMove, currentCheeses);
break;
}
}
return(count);
}
private int DLS(BoardState current, List <Pair> cheeses, List <List <Pair> > catsPath, List <List <Pair> > micePath, int limit, out int maxDepth)
{
// initialize
int count = 0;
int height = board.GetLength(0);
int width = board.GetLength(1);
List <BoardState> searchList = new List <BoardState>();
searchList.Add(current);
BoardState checkBoard;
maxDepth = -1;
while (searchList.Count > 0)
{
count++;
checkBoard = searchList[0];
searchList.Remove(searchList[0]);
// check cheeses
List <Pair> currentCheeses;
int cheesesNum = CheckCheeses(checkBoard.mice, checkBoard.cheeses, out currentCheeses);
if (cheesesNum == 0)
{
maxDepth = limit;
continue;
}
// check mice
List <PairWithIndex> currentMice;
int miceNum = CheckMice(checkBoard.mice, checkBoard.cats, checkBoard, out currentMice, micePath);
if (miceNum == 0)
{
for (int i = 0; i < checkBoard.cats.Count; i++)
{
List <Pair> catPath = new List <Pair>();
BoardState temp = checkBoard;
int index = checkBoard.cats[i].index;
while (temp.parent != null)
{
for (int k = 0; k < temp.cats.Count; k++)
{
if (temp.cats[k].index == index)
{
catPath.Insert(0, temp.cats[k].p);
break;
}
}
temp = temp.parent;
}
catsPath.Add(catPath);
}
Debug.Log("Solution is found in depth of " + checkBoard.Gn);
break;
}
// mice move, only one possibility
List <PairWithIndex> miceMove = new List <PairWithIndex>();
for (int i = 0; i < currentMice.Count; i++)
{
// mice's next step
Pair p = Mouse.NextStep(currentMice[i].p, currentCheeses, width, height);
int index = currentMice[i].index;
PairWithIndex nextStep = new PairWithIndex(p, index);
miceMove.Add(nextStep);
}
// cats move, expand all possible states
List <List <PairWithIndex> > catsCandidateSet = new List <List <PairWithIndex> >();
for (int i = 0; i < checkBoard.cats.Count; i++)
{
List <PairWithIndex> oneCatMove = new List <PairWithIndex>();
List <Pair> candidates = Cat.FindCandidates(checkBoard.cats[i].p, board);
for (int j = 0; j < candidates.Count; j++)
{
Pair p = candidates[j];
int index = checkBoard.cats[i].index;
oneCatMove.Add(new PairWithIndex(p, index));
}
catsCandidateSet.Add(oneCatMove);
}
List <List <PairWithIndex> > catsMove = new List <List <PairWithIndex> >();
Expand(catsMove, catsCandidateSet, new List <PairWithIndex>(), 0);
for (int i = 0; i < catsMove.Count; i++)
{
BoardState next = new BoardState(checkBoard, null, catsMove[i], miceMove, currentCheeses);
next.Gn = checkBoard.Gn + 1;
bool flag = false;
for (int x = 0; x < searchList.Count; x++)
{
if (searchList[x].Equals(next))
{
flag = true;
break;
}
}
if (!flag)
{
searchList.Add(next);
}
}
}
return(count);
}