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8.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define SIZE 9
+void printSudoku(int matrix[SIZE][SIZE]) {
+    for (int i = 0; i < SIZE; i++) {
+        if (i % 3 == 0) {
+            printf("-------------------------\n");
+        }
+        for (int j = 0; j < SIZE; j++) {
+            if (j % 3 == 0) {
+                printf("| ");
+            }
+            printf("%d ", matrix[i][j]);
+        }
+        printf("|\n");
+    }
+    printf("-------------------------\n");
+}
+void shuffleArray(int arr[], int size) {
+    for (int i = size - 1; i > 0; i--) {
+        int j = rand() % (i + 1);
+        int temp = arr[i];
+        arr[i] = arr[j];
+        arr[j] = temp;
+    }
+}
+void generateIncompleteMatrix(int matrix[SIZE][SIZE]) {
+    srand(time(0));
+    int nums[SIZE] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+    for (int blockRow = 0; blockRow < SIZE; blockRow += 3) {
+        shuffleArray(nums, SIZE);
+        int idx = 0;
+        for (int i = 0; i < 3; i++) {
+            int count = 3;
+            while (count > 0) {
+                int j = rand() % SIZE;
+                if (matrix[blockRow + i][j] == 0) {
+                    matrix[blockRow + i][j] = nums[idx++];
+                    count--;
+                }
+            }
+        }
+    }
+}
+int main() {
+    int matrix[SIZE][SIZE] = { 0 };
+    generateIncompleteMatrix(matrix);
+    printSudoku(matrix);
+    return 0;
+}