class sBox
{
  int iPos;
  int jPos;
  int num;
  
  boolean[] numPossible;
  
  boolean compSolved;
  
  sBox(int i, int j)
  {
    iPos = i;
    jPos = j;
    
    num = -1;
    
    numPossible = new boolean[9];
    
    compSolved = false;
    
    for(int x=0;x<numPossible.length;x++)
      numPossible[x] = true;
  }
  
  void display()
  {
    fill(0);
    
    if(num == -1)
    {
    for(int i=0;i<9;i++)
      if (numPossible[i])
        text(i+1,40*jPos+28+(i%3)*11,40*iPos+34+int(i/3)*10);
    }
    else
    {
      textSize(30);
      if (compSolved)
        fill(100);
      text(num,40*jPos+33,40*iPos+52); 
      textSize(11);
      fill(0);
    }
    
  }
  
  void setNum(int x)
  {
    for(int i=0;i<9;i++)
      numPossible[i] = false;
    
    numPossible[x-1] = true;
    
    num = x;
  }
  
  void ruleOut(int x)
  {
    numPossible[x-1] = false;
  }
  
  int numPossibilities()
  {
    int y=0;
    
    for(int i=0;i<9;i++)
      if(numPossible[i])
        y++;
    
    return y;
  }
  
  int[] getPossibilities()
  {
    int[] numbers = new int[numPossibilities()];
    
    int count = 0;
    
    for(int i=0;i<9;i++)
      if(numPossible[i])
      {
        numbers[count] = i;
        count++;
      }
      
    return numbers;
    
    
    
  }
  
}