A cool algorithm to check a Sudoku field?

Question

Does anyone know a simple algorithm to check if a Sudoku-Configuration is valid? The simplest algorithm I came up with is (for a board of size n) in Pseudocode

f         


        

Answer 1

Here is what I just did for this:

boolean checkers=true;
String checking="";
    if(a.length/3==1){}
    else{
       for(int l=1; l9||a[i][j]<1){
                checkers=false;
                break;
            }
            else{
                col[a[i].length-j][i]=a[i][j];
            }
        }
    }
    String alia="";
    for(int i=0; i