我用TicTacToe实现了一个MiniMax算法,但问题是计算机总是把'x‘放在下一个可能的位置,而不是对游戏进行评估。有人知道为什么吗?(问题只能出现在MiniMax函数或nextMove函数中。)提前谢谢!下面是代码:
int MiniMax(struct Game g, enum Symbol pl){
int score;
if (pl==CROSS)
{
score = -98765;
}
else score = 98765;
int temp_cross =0;
int temp_circle =0;
//base case
if (game_over(g) == CROSS)
return 10;
else if (game_over(g) == CIRCLE)
return -10;
else if (game_over(g) == FULL)
return 0;
int x,y;
for (y=0; y<SIZE_Y_AXIS; y++)
{
for (x=0; x<SIZE_X_AXIS; x++)
{
if (g.board.fields[x][y] == NONE)
{
if (pl == CROSS)
g.board.fields[x][y] = CROSS;
else g.board.fields[x][y] = CIRCLE;
if (pl == CROSS)
temp_cross= MiniMax(g, CIRCLE);
else temp_circle = MiniMax(g, CROSS);
g.board.fields[x][y] = NONE;
if ((pl == CROSS) && (temp_cross > score))
score = temp_cross;
else if ((pl == CIRCLE) && (temp_circle < score))
score = temp_circle;
}
}
}
return score;};
int nextMove(struct Game g, enum Symbol player){
int score_cross = -865435;
int score_cross_temp = 0;
int cross_position = 1;
int score_circle = 876545;
int score_circle_temp = 0;
int circle_position = 1;
int x,y;
for (y=0; y<SIZE_Y_AXIS; y++)
{
for (x=0; x<SIZE_X_AXIS; x++)
{
if (g.board.fields[x][y] == NONE)
{
if (player == CROSS)
{
score_cross_temp = MiniMax(g, CROSS);
printf("%d ",MiniMax(g, CROSS));
if (score_cross_temp > score_cross)
{
score_cross = score_cross_temp;
cross_position = (y)*3 + x+1;
}
}
else if (player == CIRCLE)
{
score_circle_temp = MiniMax(g, CIRCLE);
if (score_cross_temp < score_circle)
{
score_circle = score_circle_temp;
circle_position = (y)*3 + x+1;
}
}
}
}
}
if (player == CROSS)
{
//printf("%d",cross_position);
return cross_position;
}
else
{
//printf("%d",circle_position);
return circle_position;
}};
发布于 2015-01-23 03:24:54
我相信你的代码里有个bug。将分数初始化为10分,将临时变量设为任意高和低的数字。这是倒过来的。无论如何,TempCircle和TempCross都被覆盖了--我对minimax的调用。必须这样设置分数变量。替换
int score = 10;
int temp_cross = -9876543;
int temp_circle = 9876543;使用
int score;
if(pl==cross){
score = 9876543
}
else{
score = -9876543
}
int temp_cross;
int temp_circle;您的nextMove函数中似乎还存在另一个bug。我假设它的目的是迭代所有可能的移动,找到具有最高极小值的移动,并返回该移动(如果我错了请纠正我)。这不是该函数所做的。它迭代了所有的动作,但没有做任何动作。除了更新移动之外,X和y甚至从未使用过。您实际上是多次调用相同的极小值。相反,我要么完全摆脱这个函数,因为在minimax函数中有一种方法可以做到这一点,要么修复这个函数。要修复该函数,我会将其更改为:
int nextMove(struct Game g, enum Symbol player){
int score_cross = -865435;
int score_cross_temp = 0;
int cross_position = 1;
int score_circle = 876545;
int score_circle_temp = 0;
int circle_position = 1;
int x,y;
for (y=0; y<SIZE_Y_AXIS; y++)
{
for (x=0; x<SIZE_X_AXIS; x++)
{
if (g.board.fields[x][y] == NONE)
{
if (player == CROSS)
{
g.board.fields[x][y] = CROSS;
score_cross_temp = MiniMax(g, CIRCLE);
printf("%d ",MiniMax(g, CROSS));
g.board.fields[x][y] = NONE;
if (score_cross_temp > score_cross)
{
score_cross = score_cross_temp;
cross_position = (y)*3 + x+1;
}
}
else if (player == CIRCLE)
{
g.board.fields[x][y] = CIRCLE;
score_circle_temp = MiniMax(g, CROSS);
g.board.fields[x][y] = NONE;
if (score_cross_temp < score_circle)
{
score_circle = score_circle_temp;
circle_position = (y)*3 + x+1;
}
}
}
}
}
if (player == CROSS)
{
//printf("%d",cross_position);
return cross_position;
}
else
{
//printf("%d",circle_position);
return circle_position;
}
};或者您可以编辑minimax以跟踪对函数的调用。如果它是第一个递归调用(根),跟踪移动本身以及它的值。那就把行动还给我。
https://stackoverflow.com/questions/28098745
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