맥스 캣

Minimax 알고리즘을 구현하려고했습니다. 그러나 제한된 시간으로 인해 성능이 좋지 않습니다. 편집 : 이제 멀티 스레딩을 사용하지만 (내 컴퓨터에서 가장 작음) 깊이를 더 높게 설정할 수 없습니다. 그렇지 않으면 시간 초과가 발생합니다. 코어가 6 개 이상인 PC를 사용하면이 제출이 훨씬 나을 것입니다. 🙂

MaxCat vs Dijkstra :

package players;

import java.util.ArrayList;
import java.util.List;

import main.Field;

public class MaxCat implements Cat {
    final int[][] turns = { { -1, 1 }, { 0, 1 }, { -1, 0 }, { 1, 0 }, { 0, -1 }, { 1, -1 } };

    public String getName() {
        return "MaxCat";
    }

    public int[] takeTurn(Field f) {
        List<CatThread> threads = new ArrayList<>();
        int[] pos = f.findCat();
        for (int[] turn : turns) {
            if(f.read(pos[0]+turn[0], pos[1]+turn[1]) == Field.EMPTY){
                CatThread thread = new CatThread();
                thread.bestMove = turn;
                thread.field = new Field(f);
                thread.start();
                threads.add(thread);
            }
        }
        for (CatThread thread : threads) {
            try {
                thread.join();
            } catch (InterruptedException e) {}
        }
        int best = Integer.MIN_VALUE;
        int[] bestMove = { -1, 1 };
        for (CatThread thread : threads) {
            if (thread.score > best) {
                best = thread.score;
                bestMove = thread.bestMove;
            }
        }
        return bestMove;
    }

    class CatThread extends Thread {
        private Field field;
        private int[] bestMove;
        private int score;
        private final int DEPTH = 3;

        @Override
        public void run() {
            score = max(DEPTH, Integer.MIN_VALUE, Integer.MAX_VALUE);
        }

        int max(int depth, int alpha, int beta) {
            int pos[] = field.findCat();
            if (depth == 0 || field.isFinished()) {
                int moveCount = 0;
                for (int[] turn : turns) {
                    if(field.read(pos[0]+turn[0], pos[1]+turn[1]) == Field.EMPTY)
                        moveCount++;
                }
                return DEPTH-depth + moveCount;
            }
            int maxValue = alpha;
            for (int[] turn : turns) {
                if(field.read(pos[0]+turn[0], pos[1]+turn[1]) == Field.EMPTY) {
                    field.executeMove(turn);
                    int value = min(depth-1, maxValue, beta);
                    field.executeMove(new int[]{-turn[0], -turn[1]});
                    if (value > maxValue) {
                        maxValue = value;
                        if (maxValue >= beta)
                            break;
                    }
                }
            }
            return maxValue;
        }

        int min(int depth, int alpha, int beta) {
            if (depth == 0 || field.isFinished()) {
                int moveCount = 0;
                for (int[] turn : turns) {
                    int pos[] = field.findCat();
                    if(field.read(pos[0]+turn[0], pos[1]+turn[1]) == Field.EMPTY)
                        moveCount++;
                }
                return -depth - moveCount;
            }
            int[][] f = field.field;
            int minValue = beta;
            List<int[]> moves = generateBucketMoves();
            for (int[] move : moves) {
                f[move[0]][move[1]] = Field.BUCKET;
                int value = max(depth-1, alpha, minValue);
                f[move[0]][move[1]] = Field.EMPTY;
                if (value < minValue) {
                    minValue = value;
                    if (minValue <= alpha)
                        break;
                }
            }
            return minValue;
        }

        private List<int[]> generateBucketMoves() {
            int[][] f = field.field;
            List<int[]> list = new ArrayList<>();
            for (int i = 0; i < f.length; i++) {
                for (int j = 0; j < f[i].length; j++) {
                    if (f[i][j] == Field.EMPTY) {
                        list.add(new int[]{i,j});
                    }
                }
            }
            return list;
        }
    }
}

답변

package players;
/**
 * @author Cool Guy
 */

import main.Field;

public class SpiralCat implements Cat{
    public String getName(){
        return "SpiralCat";
    }
    public int[] takeTurn(Field f){
        int[][] turns = {{-1,1},{0,1},{1,0},{1,-1},{0,-1},{-1,0}};//all valid moves
        int[] move;
        int i = -1;
        do {
            i++;
            move = turns[i];
        } while(f.isValidMove(move) == false);
        return move;
    }
}

package players;

import java.util.Random;

import main.Field;

/**
* Run away from water buckets
* @author cain
*
*/

public class RabidCat implements Cat {

public RabidCat() {
}

@Override
public String getName() {
    return "RabidCat";
}

@Override
public int[] takeTurn(Field f) {
    int[][] directions = {{-1,1},{0,1},{-1,0},{1,0},{0,-1},{1,-1}};

    //where am I?
    int[] position = {0,0};
    for(int i = 0; i < 12; i++){
        for(int j = 0; j < 12; j++){
            if(f.read(i,j) == -1){
                position[0] = i;
                position[1] = j;
            }
        }
    }

    //Find the closest water
    int direction = 0;
    for(int d = 0; d < 10; d++){
        if(f.read(position[0] + d, position[1] - d) == 1 && f.isValidMove(directions[0])){
            direction = 1;
            break;
        }
        if(f.read(position[0], position[1] - d) == 1 && f.isValidMove(directions[1])){
            direction = 2;
            break;
        }
        if(f.read(position[0] + d, position[1]) == 1 && f.isValidMove(directions[2])){
            direction = 3;
            break;
        }
        if(f.read(position[0] - d, position[1]) == 1 && f.isValidMove(directions[3])){
            direction = 4;
            break;
        }
        if(f.read(position[0], position[1] + d) == 1 && f.isValidMove(directions[4])){
            direction = 5;
            break;
        }
        if(f.read(position[0] - d, position[1] + d) == 1 && f.isValidMove(directions[5])){
            direction = 6;
            break;
        }
    }

    //If there is no water near, wander
    while(direction == 0){
        Random rand = new Random();
        direction = rand.nextInt(6) + 1;
        if(!f.isValidMove(directions[direction - 1])){
            direction = 0;
        }
    }
    return directions[direction - 1];
}

}

package players;
/**
 * @author randomra
 */
import java.util.Arrays;

import main.Field;

public class ChoiceCat implements Cat {

    private class Values {
        public final int size;
        private double[][] f;

        Values(int size) {
            this.size = size;
            f = new double[size][size];
        }

        public double read(int[] p) {
            int i = p[0];
            int j = p[1];
            i = (i % size + size) % size;
            j = (j % size + size) % size;
            return f[i][j];
        }

        private double write(int[] p, double v) {
            int i = p[0];
            int j = p[1];
            i = (i % size + size) % size;
            j = (j % size + size) % size;
            return f[i][j] = v;
        }
    }

    final int[][] turns = { { -1, 1 }, { 0, 1 }, { 1, 0 }, { 1, -1 },
            { 0, -1 }, { -1, 0 } };// all valid moves CW order
    final int stepCheck = 5;

    public String getName() {
        return "ChoiceCat";
    }

    public int[] takeTurn(Field f) {

        int[] pos = f.findCat();
        int[] bestMove = { 0, 1 };
        double bestMoveValue = -1;
        for (int[] t : turns) {
            int[] currPos = { pos[0] + t[0], pos[1] + t[1] };
            double moveValue = movePosValue(currPos, f);
            if (moveValue > bestMoveValue) {
                bestMoveValue = moveValue;
                bestMove = t;
            }
        }
        return bestMove;
    }

    private double movePosValue(int[] pos, Field f) {

        Values v = new Values(f.SIZE);

        for (int ring = stepCheck; ring >= 0; ring--) {
            for (int phase = 0; phase < 2; phase++) {
                for (int sidepos = 0; sidepos < Math.max(1, ring); sidepos++) {
                    for (int side = 0; side < 6; side++) {
                        int[] evalPos = new int[2];
                        for (int coord = 0; coord < 2; coord++) {
                            evalPos[coord] = pos[coord] + turns[side][coord]
                                    * sidepos + turns[(side + 1) % 6][coord]
                                    * (ring - sidepos);
                        }
                        if (phase == 0) {
                            if (ring == stepCheck) {
                                // on outmost ring, init value
                                v.write(evalPos, -1);
                            } else {
                                v.write(evalPos, posValue(evalPos, v, f));
                            }
                        } else {
                            // finalize position value for next turn
                            v.write(evalPos, -v.read(evalPos));
                        }
                    }
                }
            }
        }

        return -v.read(pos);
    }

    private double posValue(int[] pos, Values v, Field f) {
        if (f.read(pos[0], pos[1]) == Field.BUCKET) {
            return 0;
        }
        int count = 0;
        double[] product = new double[6];
        for (int[] t : turns) {
            int[] tPos = new int[] { pos[0] + t[0], pos[1] + t[1] };
            if (v.read(tPos) > 0) {
                product[count] = 1 - 1 / (v.read(tPos) + 1);
                count++;
            }
        }
        Arrays.sort(product);
        double fp = 1;
        for (int i = 0; i < Math.min(count,2); i++) {
            fp *= product[5-i];
        }
        double retValue = Math.min(count,2) + fp;
        return -retValue;
    }
}

package players;

import main.Field;

public class StupidRightCat implements Cat{
    public String getName(){
        return "StupidRightCat";
    }
    public int[] takeTurn(Field f){
        int[][] turns = {{-1,1},{0,1},{-1,0},{1,0},{0,-1},{1,-1}};//all valid moves
        int[] move;

        if(f.isValidMove(turns[3])){
            return turns[3];
        } else {
            do {
                move = turns[(int) (turns.length * Math.random())];
            } while(f.isValidMove(move)==false);
            return move;//chose one at random
        }
    }
}