| 28 | return true; |
| 29 | } |
| 30 | public boolean isValidSudoku(char[][] board) { |
| 31 | for(int i=0; i<9; i++){ |
| 32 | ArrayList<Integer> row = new ArrayList<>(); |
| 33 | for(int j=0; j<9; j++){ |
| 34 | if(board[i][j] != '.'){ |
| 35 | int num = board[i][j] - '0'; |
| 36 | row.add(num); |
| 37 | } |
| 38 | } |
| 39 | if(!isValid(row)){ |
| 40 | return false; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | for(int i=0; i<9; i++){ |
| 45 | ArrayList<Integer> col = new ArrayList<>(); |
| 46 | for(int j=0; j<9; j++){ |
| 47 | if(board[j][i] != '.'){ |
| 48 | int num = board[j][i] - '0'; |
| 49 | col.add(num); |
| 50 | } |
| 51 | } |
| 52 | if(!isValid(col)){ |
| 53 | return false; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | for(int i=0; i<9; i+=3){ |
| 58 | for(int j=0; j<9; j+=3){ |
| 59 | ArrayList<Integer> block = new ArrayList<>(); |
| 60 | for(int k=i;k<i+3;k++){ |
| 61 | for(int l=j;l<j+3;l++){ |
| 62 | if(board[k][l] != '.'){ |
| 63 | int num = board[k][l] - '0'; |
| 64 | block.add(num); |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | if(!isValid(block)){ |
| 69 | return false; |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | return true; |
| 75 | } |
| 76 | } |