Add 第二题

第二题

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+#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");
+    }
+}
+void shuffle(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 generateMatrix(char matrix[SIZE][SIZE]) {
+    int nums[9] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+    for (int block = 0; block < 3; block++) {
+        shuffle(nums, 9);
+        for (int i = 0; i < 3; i++) {
+            int row = block * 3 + i;
+            for (int j = 0; j < SIZE; j++) {
+                matrix[row][j] = '.';
+            }
+            int positions[SIZE] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
+            shuffle(positions, SIZE);
+            for (int k = 0; k < 3; k++) {
+                matrix[row][positions[k]] = nums[i * 3 + k] + '0';
+            }
+        }
+    }
+}
+int main() {
+    srand(time(NULL));
+    char matrix[SIZE][SIZE];
+    generateMatrix(matrix);
+    printMatrix(matrix);
+    return 0;
+}