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T2.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+void print_matrix(int matrix[9][9]) {
+    int i,j;
+    for (i = 0; i < 9; i++) {
+        for (j = 0; j < 9; j++) {
+            printf("%d ", matrix[i][j]);
+        }
+        printf("\n");
+    }
+}
+
+int main() {
+    srand(time(NULL));
+    int matrix[9][9] = {0};
+    int i,j;
+    for (i = 0; i < 9; i += 3) {
+        int nums[9] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+        int flag1[9] = {0};
+        int flag2[9] = {0};
+        for(j=0;j<9;j++){
+            int t,p;
+            re1: t=rand()%9;
+            if(flag1[t]==1){
+                goto re1;}
+            re2: p=rand()%9;
+            if(flag2[p]==1){
+                goto re2;
+            }
+            matrix[i+j/3][p]=nums[t];
+            flag1[t]=1;
+            flag2[p]=1;
+            
+        }
+    }
+
+    print_matrix(matrix);
+    return 0;
+}