用c语言写一个六子棋博弈树
时间: 2024-06-09 15:12:08 浏览: 11
好的,以下是一个使用C语言实现的六子棋博弈树:
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#define ROW 6
#define COL 6
#define MAX_LEVEL 3
int evaluate(char board[ROW][COL], char player);
int minmax(char board[ROW][COL], int level, int alpha, int beta, char player, int *best_x, int *best_y);
void print_board(char board[ROW][COL]);
bool check_win(char board[ROW][COL], char player);
int main() {
char board[ROW][COL] = {
{' ', ' ', ' ', ' ', ' ', ' '},
{' ', ' ', ' ', ' ', ' ', ' '},
{' ', ' ', ' ', ' ', ' ', ' '},
{' ', ' ', ' ', ' ', ' ', ' '},
{' ', ' ', ' ', ' ', ' ', ' '},
{' ', ' ', ' ', ' ', ' ', ' '}
};
int best_x, best_y;
minmax(board, 0, -10000, 10000, 'X', &best_x, &best_y);
printf("Best move: %d, %d\n", best_x, best_y);
return 0;
}
int evaluate(char board[ROW][COL], char player) {
int score = 0;
int i, j;
// Check rows
for (i = 0; i < ROW; i++) {
int count = 0;
for (j = 0; j < COL; j++) {
if (board[i][j] == player) {
count++;
} else if (board[i][j] != ' ') {
count = 0;
break;
}
}
score += count * count;
}
// Check columns
for (j = 0; j < COL; j++) {
int count = 0;
for (i = 0; i < ROW; i++) {
if (board[i][j] == player) {
count++;
} else if (board[i][j] != ' ') {
count = 0;
break;
}
}
score += count * count;
}
// Check diagonals
for (i = 0; i < ROW; i++) {
for (j = 0; j < COL; j++) {
if (board[i][j] == player) {
if (i + 5 < ROW && j + 5 < COL &&
board[i+1][j+1] == player &&
board[i+2][j+2] == player &&
board[i+3][j+3] == player &&
board[i+4][j+4] == player &&
board[i+5][j+5] == player) {
score += 1000;
}
if (i + 5 < ROW && j - 5 >= 0 &&
board[i+1][j-1] == player &&
board[i+2][j-2] == player &&
board[i+3][j-3] == player &&
board[i+4][j-4] == player &&
board[i+5][j-5] == player) {
score += 1000;
}
}
}
}
return score;
}
int minmax(char board[ROW][COL], int level, int alpha, int beta, char player, int *best_x, int *best_y) {
if (level == MAX_LEVEL || check_win(board, 'X') || check_win(board, 'O')) {
return evaluate(board, 'X') - evaluate(board, 'O');
}
int i, j;
int best_score = -10000;
for (i = 0; i < ROW; i++) {
for (j = 0; j < COL; j++) {
if (board[i][j] == ' ') {
board[i][j] = player;
int score = -minmax(board, level+1, -beta, -alpha, (player == 'X' ? 'O' : 'X'), &i, &j);
board[i][j] = ' ';
if (score > best_score) {
best_score = score;
*best_x = i;
*best_y = j;
}
if (score > alpha) {
alpha = score;
}
if (alpha >= beta) {
break;
}
}
}
}
return best_score;
}
void print_board(char board[ROW][COL]) {
int i, j;
for (i = 0; i < ROW; i++) {
for (j = 0; j < COL; j++) {
printf("| %c ", board[i][j]);
}
printf("|\n");
}
}
bool check_win(char board[ROW][COL], char player) {
int i, j;
// Check rows
for (i = 0; i < ROW; i++) {
int count = 0;
for (j = 0; j < COL; j++) {
if (board[i][j] == player) {
count++;
} else {
count = 0;
}
if (count == 6) {
return true;
}
}
}
// Check columns
for (j = 0; j < COL; j++) {
int count = 0;
for (i = 0; i < ROW; i++) {
if (board[i][j] == player) {
count++;
} else {
count = 0;
}
if (count == 6) {
return true;
}
}
}
// Check diagonals
for (i = 0; i < ROW; i++) {
for (j = 0; j < COL; j++) {
if (board[i][j] == player) {
if (i + 5 < ROW && j + 5 < COL &&
board[i+1][j+1] == player &&
board[i+2][j+2] == player &&
board[i+3][j+3] == player &&
board[i+4][j+4] == player &&
board[i+5][j+5] == player) {
return true;
}
if (i + 5 < ROW && j - 5 >= 0 &&
board[i+1][j-1] == player &&
board[i+2][j-2] == player &&
board[i+3][j-3] == player &&
board[i+4][j-4] == player &&
board[i+5][j-5] == player) {
return true;
}
}
}
}
return false;
}
```
这个六子棋博弈树使用了Minmax算法来搜索所有可能的下一步棋,并返回最优解。具体实现过程是:先定义一个evaluate函数,用来评估当前局面的得分,然后定义一个minmax函数,用来搜索下一步棋,并返回最优解的得分。在minmax函数中,使用循环来搜索所有可能的下一步棋,然后调用evaluate函数来评估当前局面的得分。利用alpha-beta剪枝可以大大提高搜索效率。最后,定义一个check_win函数来判断是否有玩家获胜。
由于六子棋的棋盘比较小,所以在这个实现中只搜索了3层,但是如果棋盘更大的话,需要调整MAX_LEVEL的值来避免占用过多的内存和时间。
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