diff --git a/3.cpp b/3.cpp
index d786e88..1308d99 100644
--- a/3.cpp
+++ b/3.cpp
@@ -1,36 +1,60 @@
-#include <stdio.h>
-#include <stdbool.h>
-
-bool panduan(int board[9][9]) {
-    for (int i = 0; i < 9; i++) {
-        bool row[10] = { 0 }, col[10] = { 0 }, block[10] = { 0 }; 
-        for (int j = 0; j < 9; j++) {
-            if (board[i][j] != 0) {
-                if (row[board[i][j]]) {
-                    printf("The number %d in row %d has been used!\n", board[i][j], i);
-                    return false;
-                }
-                row[board[i][j]] = true;
-            }
-           
-            if (board[j][i] != 0) {
-                if (col[board[j][i]]) {
-                    printf("The number %d in column %d has been used!\n", board[j][i], i);
-                    return false;
-                }
-                col[board[j][i]] = true;
-            }
-            
-            int blockRow = 3 * (i / 3), blockCol = 3 * (i % 3);
-            if (board[blockRow + j / 3][blockCol + j % 3] != 0) {
-                if (block[board[blockRow + j / 3][blockCol + j % 3]]) {
-                    printf("The number %d in block %d has been used!\n",
-                        board[blockRow + j / 3][blockCol + j % 3], (i / 3) * 3 + (i % 3));
-                    return false;
-                }
-                block[board[blockRow + j / 3][blockCol + j % 3]] = true;
-            }
-        }
-    }
-    return true;
-}
\ No newline at end of file
+#include <stdio.h>
+#include <stdbool.h>
+
+bool panduan(int board[9][9]) {
+    for (int i = 0; i < 9; i++) {
+        bool row[10] = { 0 }, col[10] = { 0 }, block[10] = { 0 };
+        for (int j = 0; j < 9; j++) {
+            if (board[i][j] != 0) {
+                if (row[board[i][j]]) {
+                    printf("The number %d in row %d has been used!\n", board[i][j], i);
+                    return false;
+                }
+                row[board[i][j]] = true;
+            }
+
+            if (board[j][i] != 0) {
+                if (col[board[j][i]]) {
+                    printf("The number %d in column %d has been used!\n", board[j][i], i);
+                    return false;
+                }
+                col[board[j][i]] = true;
+            }
+
+            int blockRow = 3 * (i / 3), blockCol = 3 * (i % 3);
+            if (board[blockRow + j / 3][blockCol + j % 3] != 0) {
+                if (block[board[blockRow + j / 3][blockCol + j % 3]]) {
+                    printf("The number %d in block %d has been used!\n",
+                        board[blockRow + j / 3][blockCol + j % 3], (i / 3) * 3 + (i % 3));
+                    return false;
+                }
+                block[board[blockRow + j / 3][blockCol + j % 3]] = true;
+            }
+        }
+    }
+    return true;
+}
+int main()
+{
+    int board[9][9] = {
+        {0, 0, 0, 0, 7, 0, 0, 0, 0},
+        {6, 0, 0, 1, 9, 5, 0, 0, 0},
+        {0, 9, 8, 0, 0, 0, 0, 6, 0},
+        {8, 0, 0, 0, 6, 0, 0, 0, 3},
+        {4, 0, 0, 8, 0, 3, 0, 0, 1},
+        {7, 0, 0, 0, 2, 0, 0, 0, 6},
+        {0, 6, 0, 0, 0, 0, 2, 8, 0},
+        {0, 0, 0, 4, 1, 9, 0, 0, 5},
+        {0, 0, 0, 0, 8, 0, 0, 7, 9}
+    };
+    if (panduan(board)) 
+    {
+        printf("True: Valid initial Sudoku matrix!\n");  
+    }
+    
+    else  
+    {
+        printf("False: Invalid initial Sudoku matrix!\n");
+        printf("No solution!\n");
+    }
+}