Add 2

2

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define SIZE 9
+void printMatrix(char matrix[SIZE][SIZE]) {
+for (int i = 0; i < SIZE; i++) {
+for (int j = 0; j < SIZE; j++) {
+printf("%c ", matrix[i][j]);
+}
+printf("\n");
+}
+}
+int isUsed(int used[], int num) {
+for (int i = 0; i < SIZE; i++) {
+if (used[i] == num) return 1;
+}
+return 0;
+}
+void generateMatrix(char matrix[SIZE][SIZE]) {
+int used[SIZE];
+int count, num;
+for (int block = 0; block < 3; block++) {
+for (int i = 0; i < SIZE; i++) {
+used[i] = 0;
+}
+for (int i = block * 3; i < (block + 1) * 3; i++) {
+count = 0;
+while (count < 3) {
+num = rand() % 9 + 1;
+if (!isUsed(used, num)) {
+int position;
+do {
+position = rand() % SIZE;
+} while (matrix[i][position] != '.');
+matrix[i][position] = num + '0';
+used[count] = num;
+count++;
+}
+}
+}
+}
+}
+
+int main() {
+srand(time(NULL));
+char matrix[SIZE][SIZE];
+for (int i = 0; i < SIZE; i++) {
+for (int j = 0; j < SIZE; j++) {
+matrix[i][j] = '.';
+}
+}
+generateMatrix(matrix);
+printMatrix(matrix);
+return 0;
+}