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                                对《迷宫探路》做了一点改进。小人在行走过程中不走回头路,即不重复经过同一点。                      /* crazymaze.c*/
  /* 2003-8-26 */
  #include stdlib.h
  #include time.h
  #include math.h
  #include stdio.h
  #include graphics.h
  #define N 22
  #define M 22
  #define MAXLEN 200;
  int bg[M][N];
  strUCt square{
      int x;
      int y;
      int direc;
  }p[200];
  void makebg(int,int);
  void drawbg(int[][],int,int,int,int,int);
  void drawman(int,int,int);
  void rect(int,int,int,int);void main(){/* main()开始 */
  int step=20;
  int len=10;
  int size=20;
  int x=0,y=0,x0=0,y0=0;
  int i=0,j=0,k=0,count=0;
  int gdriver=DETECT,gmode;
  char ch;
  int direc;
  makebg(M,N);
  /*  registerbgidriver(EGAVGA_driver);
   initgraph(&gdriver,&gmode,"c:urboc2");*/
  initgraph(&gdriver,&gmode,"c:c20gi");
  cleardevice();
  setwritemode(XOR_PUT);
  settextstyle(1,0,3);
  setcolor(GREEN);
  outtextxy(100,180,"Press Q to quit");
  setcolor(BLUE);
  setfillstyle(LINE_FILL,BLUE);drawbg(bg,M,N,size,0,0);
  setcolor(GREEN);
  outtextxy(60,120,"PRESS KEY 1 :YOU ,");
  outtextxy(70,150,"OTHER KEY :AUTOMATIC");
  setcolor(WH99vE);
  x+=len;y+=len;
  drawman(x,y,len);
  x0=x;y0=y;
  if((ch=getch())=='1'){
  /* 人工控制 */
  while((ch=getch())!='q'){
    delay(800);
    drawman(x,y,len);
    switch(ch){
      case 'a':
          if(j0&&bg[i][j-1]==0){
              if(xstep){x-=step;j--;};
          }
          break;
      case 's':
          if(iM-1&&bg[i+1][j]==0){
              if(y479-step){y+=step;i++;};
          }
          break;
      case 'd':
          if(jN-1&&bg[i][j+1]==0){
              if(x639-step){x+=step;j++;}
          }
          break;
      case 'w':
          if(i0&&bg[i-1][j]==0){
              if(ystep){y-=step;i--;}
          }
          break;
      default :break;
    }
    drawman(x,y,len);
   if(i=M-1&&j=N-1){
      settextstyle(4,0,3);
      setcolor(RED);
      outtextxy(150,260,"YOU WIN!");
    }
    setcolor(WH99vE);
  }
   closegraph();
  }/* 人工控制结束 */     
  else{
  /* 电脑控制 */
  /* direc表示上一步运动方向 */
  /* 并表示下一步运动方向 */
  /* 0~3分别表示 西、北、东、南 */direc=2;
  i=j=0;k=0;
  while(iM-1jN-1){
      switch(direc){
      case 0:
          /* 以3,0,1,2的次序尝试 */ 
          if(iM-1&&bg[i+1][j]==0){
              y+=step;i++;
              direc=3;
          }
          else if(j0&&bg[i][j-1]==0){
              x-=step;j--;
              direc=0;
          }
          else if(i0&&bg[i-1][j]==0){
              y-=step;i--;
              direc=1;
          }
          else {
              x+=step;j++;
              direc=2;
          }
          p[k].x=x;
          p[k].y=y;
          p[k].direc=direc;
          if(k0){
              count=k-1;
              while(count=0
              &&(p[count].x!=p[k].XP[count].y!=p[k].y))
              count--;
              if(count=0){
                  k=count;
                  p[k].direc=direc;
                  i=(p[k].y-len)/step;
                  j=(p[k].x-len)/step;
              }
          }
          k++;
          break;
      case 1:
          if(j0&&bg[i][j-1]==0){
              x-=step;j--;
              direc=0;
          }
          else if(i0&&bg[i-1][j]==0){
              y-=step;i--;
              direc=1;
          }
          else if(jN-1&&bg[i][j+1]==0){
              x+=step;j++;
              direc=2;
          }
          else{
              y+=step;i++;
              direc=3;
          }
          p[k].x=x;
          p[k].y=y;
          p[k].direc=direc;
          if(k0){
              count=k-1;
              while(count=0
              &&(p[count].x!=p[k].xp[count].y!=p[k].y))
              count--;
         &