mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.4 KiB
72 lines
2.4 KiB
5 months ago
|
## Valid Sudoku
|
||
|
|
|
||
|
|
### Instructions
|
||
|
|
|
||
|
|
Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:
|
||
|
|
|
||
|
|
1. Each row must contain the digits 1-9 without repetition.
|
||
|
|
2. Each column must contain the digits 1-9 without repetition.
|
||
|
|
3. Each of the nine 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition.
|
||
|
|
|
||
|
|
The Sudoku board could be partially filled, where empty cells are filled with the character '.'.
|
||
|
|
|
||
|
|
### Expected Class
|
||
|
|
|
||
|
|
```java
|
||
|
|
public class ValidSudoku {
|
||
|
|
public boolean isValidSudoku(char[][] board) {
|
||
|
|
// Implementation to determine if the Sudoku board is valid
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
### Usage
|
||
|
|
|
||
|
|
Here is a possible `ExerciseRunner.java` to test your class:
|
||
|
|
|
||
|
|
```java
|
||
|
|
public class ExerciseRunner {
|
||
|
|
public static void main(String[] args) {
|
||
|
|
ValidSudoku validSudoku = new ValidSudoku();
|
||
|
|
|
||
|
|
// Test case 1
|
||
|
|
char[][] board1 = {
|
||
|
|
{'5', '3', '.', '.', '7', '.', '.', '.', '.'},
|
||
|
|
{'6', '.', '.', '1', '9', '5', '.', '.', '.'},
|
||
|
|
{'.', '9', '8', '.', '.', '.', '.', '6', '.'},
|
||
|
|
{'8', '.', '.', '.', '6', '.', '.', '.', '3'},
|
||
|
|
{'4', '.', '.', '8', '.', '3', '.', '.', '1'},
|
||
|
|
{'7', '.', '.', '.', '2', '.', '.', '.', '6'},
|
||
|
|
{'.', '6', '.', '.', '.', '.', '2', '8', '.'},
|
||
|
|
{'.', '.', '.', '4', '1', '9', '.', '.', '5'},
|
||
|
|
{'.', '.', '.', '.', '8', '.', '.', '7', '9'}
|
||
|
|
};
|
||
|
|
System.out.println("Is board1 valid? " + validSudoku.isValidSudoku(board1)); // Expected output: true
|
||
|
|
|
||
|
|
// Test case 2
|
||
|
|
char[][] board2 = {
|
||
|
|
{'8', '3', '.', '.', '7', '.', '.', '.', '.'},
|
||
|
|
{'6', '.', '.', '1', '9', '5', '.', '.', '.'},
|
||
|
|
{'.', '9', '8', '.', '.', '.', '.', '6', '.'},
|
||
|
|
{'8', '.', '.', '.', '6', '.', '.', '.', '3'},
|
||
|
|
{'4', '.', '.', '8', '.', '3', '.', '.', '1'},
|
||
|
|
{'7', '.', '.', '.', '2', '.', '.', '.', '6'},
|
||
|
|
{'.', '6', '.', '.', '.', '.', '2', '8', '.'},
|
||
|
|
{'.', '.', '.', '4', '1', '9', '.', '.', '5'},
|
||
|
|
{'.', '.', '.', '.', '8', '.', '.', '7', '9'}
|
||
|
|
};
|
||
|
|
System.out.println("Is board2 valid? " + validSudoku.isValidSudoku(board2)); // Expected output: false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
### Expected Output
|
||
|
|
|
||
|
|
```shell
|
||
|
|
$ javac *.java -d build
|
||
|
|
$ java -cp build ExerciseRunner
|
||
|
|
Is board1 valid? true
|
||
|
|
Is board2 valid? false
|
||
|
|
$
|
||
|
|
```
|