From caaa46afe6d87196afed6082e9a512746fff032e Mon Sep 17 00:00:00 2001
From: amin <amin@192.168.11.142>
Date: Wed, 3 Jul 2024 03:20:12 +0100
Subject: [PATCH] test: adding subject and main

---
 .../valid-sudoku/ExerciseRunner.java          | 33 +++++++++
 .../java/checkpoints/valid-sudoku/README.md   | 71 +++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 subjects/java/checkpoints/valid-sudoku/ExerciseRunner.java
 create mode 100644 subjects/java/checkpoints/valid-sudoku/README.md

diff --git a/subjects/java/checkpoints/valid-sudoku/ExerciseRunner.java b/subjects/java/checkpoints/valid-sudoku/ExerciseRunner.java
new file mode 100644
index 000000000..480118bc0
--- /dev/null
+++ b/subjects/java/checkpoints/valid-sudoku/ExerciseRunner.java
@@ -0,0 +1,33 @@
+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
+    }
+}
diff --git a/subjects/java/checkpoints/valid-sudoku/README.md b/subjects/java/checkpoints/valid-sudoku/README.md
new file mode 100644
index 000000000..caf0b9061
--- /dev/null
+++ b/subjects/java/checkpoints/valid-sudoku/README.md
@@ -0,0 +1,71 @@
+## 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
+$
+```