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

void initializeArray(char **array, int width, int height)
{
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            array[i][j] = '.';
        }
    }

    // 隨機在地圖上放置 3 個 M 並且不重複
    int count = 0;
    while (count < 3)
    {
        int x = rand() % width;
        int y = rand() % height;
        if (array[y][x] == '.')
        {
            array[y][x] = 'M';
            count++;
        }
    }

    count = 0;

    while (count < 2)
    {
        int x = rand() % width;
        int y = rand() % height;
        if (array[y][x] == '.')
        {
            array[y][x] = 'B';
            count++;
        }
    }

    // 隨機放置 1 個 P 且上下左右都不會有 M
    int x = rand() % width;
    int y = rand() % height;
    while (array[y][x] != '.')
    {
        x = rand() % width;
        y = rand() % height;
    }
    array[y][x] = 'P';

    // 隨機放置 1 個 S 並確保 上下左右都不會有 P
    x = rand() % width;
    y = rand() % height;
    while (array[y][x] != '.' || (y > 0 && array[y - 1][x] == 'P') || (y < height - 1 && array[y + 1][x] == 'P') || (x > 0 && array[y][x - 1] == 'P') || (x < width - 1 && array[y][x + 1] == 'P'))
    {
        x = rand() % width;
        y = rand() % height;
    }
    array[y][x] = 'S';
}

void printArray(char **array, int width, int height)
{
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            printf("%c ", array[i][j]);
        }
        printf("\n");
    }
}

int move(char **array, int width, int height, char direction)
{

    int px = -1, py = -1;

    // 找玩家的位置
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            if (array[i][j] == 'P')
            {
                px = j;
                py = i;
                break;
            }
        }
        if (px != -1)
            break;
    }

    switch (direction)
    {
    case 'w':
        if (py > 0 && array[py - 1][px] != 'M' && array[py - 1][px] != 'S')
            if (py > 0 && array[py - 1][px] != 'M')
            {
                array[py][px] = '.';
                array[py - 1][px] = 'P';
            }else if (array[py - 1][px] == 'M')
            {
               return 1;
            }else
            {
                return 0;
            }
        break;

    case 's':
        if (py < height - 1 && array[py + 1][px] != 'M' && array[py + 1][px] != 'S')
        {
            array[py][px] = '.';
            array[py + 1][px] = 'P';
        }
        else if (array[py+1][px] == 'M')
        {
             return 1;
        }else
        {
            return 2;
        }
        break;

    case 'a':
        if (px > 0 && array[py][px - 1] != 'M' && array[py][px-1] != 'S')
        {
            array[py][px] = '.';
            array[py][px - 1] = 'P';
        }
        else if (array[py][px - 1] == 'M')
        {
             return 1;
        }else
        {
            return 2;
        }
        break;

    case 'd':
        if (px < width - 1 && array[py][px + 1] != 'M' && array[py][px +1] != 'S')
        {
            array[py][px] = '.';
            array[py][px + 1] = 'P';
        }
        else if (array[py][px + 1] == 'M')
        {
             return 1;
        }else
        {
            return 2;
        }
        break;

    default:
        printf("Invaild Input\n");
        return 0;
    }

    return 0;
}

// map中的所有 M 會向 上下左右 隨機移動一格
void moveMonster(char **array, int width, int height)
{
    // 找怪物的位置並回機移動一格
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            if (array[i][j] == 'M')
            {
                array[i][j] = '.';
                int direction;
                do
                {
                    direction = rand() % 4;
                    // 檢查移動後是否會超出地圖範圍
                    switch (direction)
                    {
                    case 0:
                        if (i > 0 && array[i - 1][j] != 'P')
                        {
                            i--;
                        }
                        break;

                    case 1:
                        if (i < height - 1 && array[i + 1][j] != 'P')
                        {
                            i++;
                        }
                        break;

                    case 2:
                        if (j > 0 && array[i][j - 1] != 'P')
                        {
                            j--;
                        }
                        break;

                    case 3:
                        if (j < width - 1 && array[i][j + 1] != 'P')
                        {
                            j++;
                        }
                        break;
                    }
                } while (i < 0 || i >= height || j < 0 || j >= width);
                array[i ][j] = '!';
            }
        }
    }

    //搜尋map並把所有!換成M
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {

            if (array[i][j] == '!')
            {
                array[i][j] = 'M';
            }
        }
    }
}

int main()
{
    int width, height;
    scanf("%d", &width);
    scanf("%d", &height);

    char **array = (char **)malloc(height * sizeof(char *));
        for (int i = 0; i < height; i++)
        {
            array[i] = (char *)malloc(width * sizeof(char));
        }

    initializeArray(array, width, height);

    printArray(array, width, height);

    int isGameOver = 0;

    while (isGameOver == 0)
    {
        // let user input direction
        char direction;
        scanf(" %c", &direction);
        switch (move(array, width, height, direction))
        {
        case 1:
            isGameOver = 1;
            printf("Game over!\n");
            break;
        case 2:
            isGameOver = 1;
            printf("You win!\n");
            break;
        default:
            break;
        }

        if (isGameOver == 1)
        {
            break;
        }

        moveMonster(array, width, height);

        printArray(array, width, height);
    }

    for (int i = 0; i < height; i++)
    {
        free(array[i]);
    }
    free(array);

    return 0;
}
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