12344321/T2.cpp

#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;
}