C语言实现迷宫小游戏

代码如下，时间太晚，有空补注释：

#include<stdio.h>
#include<string.h>
#include<time.h>
#include<stdlib.h>
#include<windows.h>
#define n 21
#define m 37
#define up 1
#define down 2
#define left 3
#define right 4
#define Key_Up 72
#define Key_Down 80
#define Key_Right 77
#define Key_Left 75
typedef struct Point
{
    int x;
    int y;
    int pos;
}point;
HANDLE h_out_buf;//缓冲技术解决闪屏
COORD coord={0,0};
DWORD bytes=0;
char data[n+2][m*2+4];
int maze[n+2][m+2];
point p[10000];
int l=0;
point start,end;
void add(point t)
{
    p[l]=t;
    l++;
}
void add_neibor(point t)//将当前点周围的邻墙加入数组中
{
    point q;
    if(t.x+1<=n)
    {
        q=t;
        q.x=t.x+1;
        q.pos=down;
        add(q);
    }
    if(t.x-1>=1)
    {
        q=t;
        q.x=t.x-1;
        q.pos=up;
        add(q);
    }
    if(t.y+1<=m)
    {
        q=t;
        q.y=t.y+1;
        q.pos=right;
        add(q);
    }
    if(t.y-1>=1)
    {
        q=t;
        q.y=t.y-1;
        q.pos=left;
        add(q);
    }
}
void del(int index)
{
    int i;
    for(i=index;i<l-1;i++)
        p[i]=p[i+1];
    l--;
}
void show_maze()
{
    int i,j;
    for(i=0;i<n+2;i++)
    {
        for(j=0;j<m+2;j++)
        {
            if(!maze[i][j])
            {
                data[i][2*j]='*';
                data[i][2*j+1]=' ';
            }
            else if(maze[i][j]==1)
            {
                data[i][2*j]=' ';
                data[i][2*j+1]=' ';
            }
            else if(maze[i][j]==2)
            {
                data[i][2*j]=2;
                data[i][2*j+1]=' ';
            }
            else
            {
                data[i][2*j]=1;
                data[i][2*j+1]=' ';
            }
        }
    }
    for(i=0;i<n+2;i++)
    {
        coord.Y=i;
        WriteConsoleOutputCharacterA(h_out_buf, data[i], 2*j, coord, &bytes);
    }
    SetConsoleActiveScreenBuffer(h_out_buf);
}
void creat_maze()
{
    int i,j,x,y;
    point q;
    memset(maze,0,sizeof(maze));
    srand((unsigned)time(NULL));
    start.x=1;
    start.y=1;
    end.x=n;
    end.y=m;
    maze[1][1]=1;
    add_neibor(start);
    while(l)
    {
        int r=rand()%l;
        if(p[r].pos==up)
        {
            x=p[r].x-1;
            y=p[r].y;
        }
        if(p[r].pos==down)
        {
            x=p[r].x+1;
            y=p[r].y;
        }
        if(p[r].pos==left)
        {
            x=p[r].x;
            y=p[r].y-1;
        }
        if(p[r].pos==right)
        {
            x=p[r].x;
            y=p[r].y+1;
        }
        if(maze[x][y]==0)
        {
            maze[p[r].x][p[r].y]=1;
            maze[x][y]=1;
            q.x=x;
            q.y=y;
            add_neibor(q);
        }
        del(r);
    }
    maze[start.x][start.y]=2;
    maze[end.x][end.y]=3;
}
void win()
{
    int i,j;
    char a[30]="CONGRATULATIONS!";
    char b[30]="YOU WIN THIS GAME!";
    char c[30]="AUTHOR:天道铸魂";
    char d[30]="按任意键结束游戏";
    memset(data,0,sizeof(data));
    for(i=0;i<n+2;i++)
    {
        for(j=0;j<m+2;j++)
        {
            data[i][2*j]=' ';
            data[i][2*j+1]=' ';
        }
    }
    strcpy(data[7]+31,a);
    strcpy(data[9]+30,b);
    strcpy(data[11]+31,c);
    strcpy(data[18]+30,d);
    for(i=0;i<n+2;i++)
    {
        coord.Y=i;
        WriteConsoleOutputCharacterA(h_out_buf, data[i], 2*j, coord, &bytes);
    }
    SetConsoleActiveScreenBuffer(h_out_buf);
}
void play_game()
{
    int key1,key;
    point now;
    now.x=now.y=1;
    while(1)
    {
        show_maze();
        if(now.x==n&&now.y==m)
        {
            system("cls");
            win();
            break;
        }
        key1=getch();
        key=getch();
        if(key==Key_Up)
        {
            if(now.x-1>0)
            {
                if(maze[now.x-1][now.y])
                {
                    maze[now.x][now.y]=1;
                    now.x--;
                    maze[now.x][now.y]=2;
                }
            }
        }
        else if(key==Key_Down)
        {
            if(now.x+1<=n)
            {
                if(maze[now.x+1][now.y])
                {
                    maze[now.x][now.y]=1;
                    now.x++;
                    maze[now.x][now.y]=2;
                }
            }
        }    
        else if(key==Key_Left)
        {
            if(now.y-1>0)
            {
                if(maze[now.x][now.y-1])
                {
                    maze[now.x][now.y]=1;
                    now.y--;
                    maze[now.x][now.y]=2;
                }
            }
            
        }
        else if(key==Key_Right)
        {
            if(now.y+1>0)
            {
                if(maze[now.x][now.y+1])
                {
                    maze[now.x][now.y]=1;
                    now.y++;
                    maze[now.x][now.y]=2;
                }
            }
        }
    }
}
void start_game()
{
    creat_maze();
    play_game();
}
int main()
{
    h_out_buf = CreateConsoleScreenBuffer(GENERIC_WRITE,FILE_SHARE_WRITE,NULL,CONSOLE_TEXTMODE_BUFFER,NULL);
    CONSOLE_CURSOR_INFO cci;
    cci.bVisible = 0;
    cci.dwSize = 1;
    SetConsoleCursorInfo(h_out_buf, &cci);
    start_game();
    return 0;
}