如何在特定空间输出有效数字列表？（对于Sudoku）

Question

这就是我所拥有的。该方法应输出该空间中所有可用数字的数组。由于某些原因，这不会针对相同的框/行/列过滤掉。应该如何正确编码？

  public int[] getAllowedValues(int row, int col){//both
    int[] allowedValues = new int[9];
    for(int i = 0; i < 9; i++){
      allowedValues[i] = i;
    }
    for(int i = 0; i < 9; i++){
      if(!(board[i][col] == 0)){
        allowedValues[board[i][col]] = 0; //anything with a 0 is illegal, with number means that number is legal
      }
      if(!(board[row][i] == 0)){
        allowedValues[board[row][i]] = 0; //anything with a 0 is illegal, with number means that number is legal
      }
    }
    int rowStart = 0; //rowStart is the top left coord of box the number is in
    if(row <= 3){ 
      rowStart = 1;
    } else if (row <= 6){
      rowStart = 4;
    } else if (row <= 9){
      rowStart = 7;
    }
    int colStart = 0; //colStart is the top left coord of the box the number is in
    if(col <= 3){
     colStart = 1;
    } else if (col <= 6){
     colStart = 4;
    } else if (col <= 9){
     colStart = 7;
    }
    for(int i = rowStart; i < rowStart + 3; i++){
      for(int j = colStart; j < colStart + 3; j++){
        if(!(board[i-1][j-1] == 0)){
          allowedValues[board[i-1][j-1]] = 0;
        }
      }
    }
    for(int i = row; i < 9; i++){
      for(int j = col; j < 9; j++){
        if((board[i][j] == 0)){
          allowedValues[board[i][j]] = 0;
        }
        if((board[j][i] == 0)){
          allowedValues[board[j][i]] = 0;
        }
      }
    }
    return allowedValues;
  }

Answer 1

我将为您提供编码方法的步骤。

1）导入ArrayList

2）创建一个值为1到9的ArrayList

3）对于行中的每个数字，列数或3 x 3平方（因此不是允许的数量），请使用以下代码：

//x is a number in the row/collumn/square and al is the ArrayList
if(al.contains(x))al.remove(al.indexOf(x));

4）将方法类型从int []更改为ArrayList

5）返回ArrayList

如果您有任何困难或需要帮助，请告诉我。