六子棋启发式搜索c语言代码

以下是六子棋启发式搜索的C语言代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define BOARD_SIZE 6
#define MAX_DEPTH 5

typedef struct {
    int x;
    int y;
} Point;

int board[BOARD_SIZE][BOARD_SIZE];
int player = 1;

int evaluate() {
    int score = 0;
    // 统计玩家和对手的连续棋子数，计算得分
    for (int i = 0; i < BOARD_SIZE; i++) {
        for (int j = 0; j < BOARD_SIZE; j++) {
            if (board[i][j] == player) {
                // 统计横向连续棋子数
                int count = 1;
                for (int k = 1; k < 6 && j + k < BOARD_SIZE; k++) {
                    if (board[i][j + k] == player) {
                        count++;
                    } else {
                        break;
                    }
                }
                if (count == 5) {
                    return 10000;
                } else if (count > 1) {
                    score += count * count;
                }
                // 统计纵向连续棋子数
                count = 1;
                for (int k = 1; k < 6 && i + k < BOARD_SIZE; k++) {
                    if (board[i + k][j] == player) {
                        count++;
                    } else {
                        break;
                    }
                }
                if (count == 5) {
                    return 10000;
                } else if (count > 1) {
                    score += count * count;
                }
                // 统计右上方向连续棋子数
                count = 1;
                for (int k = 1; k < 6 && i - k >= 0 && j + k < BOARD_SIZE; k++) {
                    if (board[i - k][j + k] == player) {
                        count++;
                    } else {
                        break;
                    }
                }
                if (count == 5) {
                    return 10000;
                } else if (count > 1) {
                    score += count * count;
                }
                // 统计左上方向连续棋子数
                count = 1;
                for (int k = 1; k < 6 && i - k >= 0 && j - k >= 0; k++) {
                    if (board[i - k][j - k] == player) {
                        count++;
                    } else {
                        break;
                    }
                }
                if (count == 5) {
                    return 10000;
                } else if (count > 1) {
                    score += count * count;
                }
            }
        }
    }
    return score;
}

int alpha_beta_search(int depth, int alpha, int beta) {
    if (depth == 0) {
        return evaluate();
    }
    Point points[BOARD_SIZE * BOARD_SIZE];
    int num_points = 0;
    // 生成可行解
    for (int i = 0; i < BOARD_SIZE; i++) {
        for (int j = 0; j < BOARD_SIZE; j++) {
            if (board[i][j] == 0) {
                points[num_points].x = i;
                points[num_points].y = j;
                num_points++;
            }
        }
    }
    // 按照得分排序
    for (int i = 0; i < num_points - 1; i++) {
        for (int j = i + 1; j < num_points; j++) {
            board[points[i].x][points[i].y] = player;
            int score1 = evaluate();
            board[points[i].x][points[i].y] = 0;
            board[points[j].x][points[j].y] = player;
            int score2 = evaluate();
            board[points[j].x][points[j].y] = 0;
            if (score2 > score1) {
                Point temp = points[i];
                points[i] = points[j];
                points[j] = temp;
            }
        }
    }
    if (num_points == 0) {
        return evaluate();
    }
    if (player == 1) {
        int max_score = -10000;
        for (int i = 0; i < num_points; i++) {
            board[points[i].x][points[i].y] = player;
            player = 2;
            int score = alpha_beta_search(depth - 1, alpha, beta);
            player = 1;
            board[points[i].x][points[i].y] = 0;
            if (score > max_score) {
                max_score = score;
            }
            if (max_score >= beta) {
                return max_score;
            }
            if (max_score > alpha) {
                alpha = max_score;
            }
        }
        return max_score;
    } else {
        int min_score = 10000;
        for (int i = 0; i < num_points; i++) {
            board[points[i].x][points[i].y] = player;
            player = 1;
            int score = alpha_beta_search(depth - 1, alpha, beta);
            player = 2;
            board[points[i].x][points[i].y] = 0;
            if (score < min_score) {
                min_score = score;
            }
            if (min_score <= alpha) {
                return min_score;
            }
            if (min_score < beta) {
                beta = min_score;
            }
        }
        return min_score;
    }
}

int main() {
    // 初始化棋盘
    for (int i = 0; i < BOARD_SIZE; i++) {
        for (int j = 0; j < BOARD_SIZE; j++) {
            board[i][j] = 0;
        }
    }
    // 随机先手或后手
    srand(time(NULL));
    player = rand() % 2 + 1;
    while (1) {
        if (player == 1) {
            // 玩家输入落子位置
            int x, y;
            printf("Your turn: ");
            scanf("%d %d", &x, &y);
            if (x < 0 || x >= BOARD_SIZE || y < 0 || y >= BOARD_SIZE || board[x][y] != 0) {
                printf("Invalid move!\n");
                continue;
            }
            board[x][y] = player;
            // 判断玩家是否胜利
            int score = evaluate();
            if (score >= 10000) {
                printf("You win!\n");
                break;
            }
            player = 2;
        } else {
            // AI搜索最优解
            int max_score = -10000;
            Point best_point;
            for (int i = 0; i < BOARD_SIZE; i++) {
                for (int j = 0; j < BOARD_SIZE; j++) {
                    if (board[i][j] == 0) {
                        board[i][j] = player;
                        player = 2;
                        int score = alpha_beta_search(MAX_DEPTH, -10000, 10000);
                        player = 1;
                        board[i][j] = 0;
                        if (score > max_score) {
                            max_score = score;
                            best_point.x = i;
                            best_point.y = j;
                        }
                    }
                }
            }
            printf("AI's turn: %d %d\n", best_point.x, best_point.y);
            board[best_point.x][best_point.y] = player;
            // 判断AI是否胜利
            int score = evaluate();
            if (score >= 10000) {
                printf("AI wins!\n");
                break;
            }
            player = 1;
        }
    }
    return 0;
}

这段代码实现了基于α-β剪枝的六子棋启发式搜索算法，可以在控制台进行人机对弈。其中，evaluate()函数用于评估当前局面的得分，alpha_beta_search()函数用于执行α-β剪枝的搜索，main()函数实现了人机对弈的流程。