ChainCollector
Bot này thích chuỗi 1 . Anh ấy muốn càng nhiều trong số họ càng tốt. Đôi khi anh ta thậm chí hy sinh một phần nhỏ của chuỗi để giành được phần lớn hơn.
[1] Một chuỗi bao gồm các cây bút được nối với nhau bằng hàng rào mở, trong đó mỗi cây bút có 1 hoặc 2 hàng rào mở. Nếu một cây bút duy nhất thuộc về chuỗi có thể được hoàn thành, thì do quy tắc vô địch, toàn bộ chuỗi cũng có thể được hoàn thành.
package pigpen.players;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.TreeMap;
import pigpen.Board;
import pigpen.Pen;
import pigpen.Player;
public class ChainCollector extends Player {
private enum Direction {
TOP, RIGHT, BOTTOM, LEFT;
public Direction opposite() {
return values()[(ordinal() + 2) % 4];
}
}
private enum ChainEndType {
OPEN, CLOSED, LOOP
}
private static class PenEx {
private final int id;
private final List<Fence> openFences = new ArrayList<>();
private boolean used = false;
public PenEx(int id) {
super();
this.id = id;
}
public void addOpenFence(Direction direction, PenEx child) {
openFences.add(new Fence(this, direction, child));
if (child != null) {
child.openFences.add(new Fence(child, direction.opposite(), this));
}
}
}
private static class Fence {
public final PenEx parent;
public final Direction direction;
public final PenEx child;
public Fence(PenEx parent, Direction direction, PenEx child) {
super();
this.parent = parent;
this.direction = direction;
this.child = child;
}
public int[] getMove() {
if (parent == null) {
return new int[] { child.id, direction.opposite().ordinal() };
} else {
return new int[] { parent.id, direction.ordinal() };
}
}
}
private static class Moves {
private final TreeMap<Integer, List<Fence>> map = new TreeMap<>();
public void add(int score, Fence move) {
List<Fence> list = map.get(score);
if (list == null) {
list = new ArrayList<>();
map.put(score, list);
}
list.add(move);
}
public boolean isEmpty() {
return map.isEmpty();
}
public boolean hasExactlyOne() {
return map.size() == 1 && map.firstEntry().getValue().size() == 1;
}
public int getLowestScore() {
return map.firstKey();
}
public int[] getLowMove() {
return map.firstEntry().getValue().get(0).getMove();
}
public int[] getHighMove() {
return map.lastEntry().getValue().get(0).getMove();
}
}
private static class BoardEx {
private final List<PenEx> pens = new ArrayList<>();
private final Moves neutralMoves = new Moves();
private final Moves finisherMoves = new Moves();
private final Moves safeFinisherMoves = new Moves();
private final Moves sacrificeMoves = new Moves();
private final Moves badMoves = new Moves();
public BoardEx(Board board) {
super();
PenEx[][] tmp = new PenEx[board.rows][board.cols];
for (int row = 0; row < board.rows; ++row) {
for (int col = 0; col < board.cols; ++col) {
Pen pen = board.getPenAt(row, col);
int[] fences = pen.fences();
PenEx penEx = new PenEx(pen.id());
tmp[row][col] = penEx;
pens.add(penEx);
if (fences[Pen.TOP] == 0) {
penEx.addOpenFence(Direction.TOP, row == 0 ? null : tmp[row - 1][col]);
}
if (row == board.rows - 1 && fences[Pen.BOTTOM] == 0) {
penEx.addOpenFence(Direction.BOTTOM, null);
}
if (fences[Pen.LEFT] == 0) {
penEx.addOpenFence(Direction.LEFT, col == 0 ? null : tmp[row][col - 1]);
}
if (col == board.cols - 1 && fences[Pen.RIGHT] == 0) {
penEx.addOpenFence(Direction.RIGHT, null);
}
}
}
}
private ChainEndType followChain(Fence begin, List<Fence> result) {
Fence current = begin;
for (;;) {
current.parent.used = true;
result.add(current);
if (current.child == null) {
return ChainEndType.OPEN;
}
List<Fence> childFences = current.child.openFences;
switch (childFences.size()) {
case 1:
current.child.used = true;
return ChainEndType.CLOSED;
case 2:
if (current.child == begin.parent) {
return ChainEndType.LOOP;
} else {
current = current.direction.opposite() == childFences.get(0).direction ?
childFences.get(1) : childFences.get(0);
}
break;
case 3:
case 4:
return ChainEndType.OPEN;
default:
throw new IllegalStateException();
}
}
}
public void findChains() {
for (PenEx pen : pens) {
if (!pen.used && pen.openFences.size() > 0) {
if (pen.openFences.size() < 3) {
List<Fence> fences = new ArrayList<>();
ChainEndType type1 = pen.openFences.size() == 1 ?
ChainEndType.CLOSED : followChain(pen.openFences.get(1), fences);
if (type1 == ChainEndType.LOOP) {
badMoves.add(fences.size(), fences.get(0));
} else {
Collections.reverse(fences);
ChainEndType type2 = followChain(pen.openFences.get(0), fences);
if (type1 == ChainEndType.OPEN && type2 == ChainEndType.CLOSED) {
type1 = ChainEndType.CLOSED;
type2 = ChainEndType.OPEN;
Collections.reverse(fences);
}
if (type1 == ChainEndType.OPEN) {
badMoves.add(fences.size() - 1, fences.get(fences.size() / 2));
} else if (type2 == ChainEndType.CLOSED) {
finisherMoves.add(fences.size() + 1, fences.get(0));
if (fences.size() == 3) {
sacrificeMoves.add(fences.size() + 1, fences.get(1));
} else {
safeFinisherMoves.add(fences.size() + 1, fences.get(0));
}
} else {
finisherMoves.add(fences.size(), fences.get(0));
if (fences.size() == 2) {
sacrificeMoves.add(fences.size(), fences.get(1));
} else {
safeFinisherMoves.add(fences.size(), fences.get(0));
}
}
}
} else {
pen.used = true;
for (Fence fence : pen.openFences) {
if (fence.child == null || fence.child.openFences.size() > 2) {
neutralMoves.add(fence.child == null ? 0 : fence.child.openFences.size(), fence);
}
}
}
}
}
}
public int[] bestMove() {
if (!neutralMoves.isEmpty()) {
if (!finisherMoves.isEmpty()) {
return finisherMoves.getHighMove();
}
return neutralMoves.getHighMove();
}
if (!safeFinisherMoves.isEmpty()) {
return safeFinisherMoves.getHighMove();
}
if (badMoves.isEmpty() && !finisherMoves.isEmpty()) {
return finisherMoves.getHighMove();
}
if (!sacrificeMoves.isEmpty()) {
if (sacrificeMoves.hasExactlyOne()) {
if (badMoves.getLowestScore() - sacrificeMoves.getLowestScore() >= 2) {
return sacrificeMoves.getLowMove();
} else {
return finisherMoves.getHighMove();
}
} else {
return finisherMoves.getHighMove();
}
}
if (!badMoves.isEmpty()) {
return badMoves.getLowMove();
}
return null;
}
}
@Override
public int[] pick(Board board, int id, int round) {
BoardEx boardEx = new BoardEx(board);
boardEx.findChains();
return boardEx.bestMove();
}
}
