#include<stdio.h>
#include<stdlib.h>
#include<time.h>
 
int main(){
	
	srand(time(NULL));
	int board[9][9];
	
	int num[9]={1,2,3,4,5,6,7,8,9};
	for(int i =0;i<9;i++)
	{
		if(i%3==0)
		{
			for(int j =0;j<9;j++)
			{
				int k =rand()%9;
				int temp = num[j];
				num[j] = num[k];
				num[k] = temp;
			}
		}
		for(int j = 0;j<9;j++)          //定义矩阵各元素为0 
		{
			board[i][j] = 0;
		}
		for(int m = 0;m<3;m++)
		{
			int index;
			do{
				index = rand()%9;
			}while(board[i][index]!=0);
			board[i][index] = num[3*(i%3)+m];
		}	
	}

 printf("The original Sudoku matrix: \n");   //格式化输出 
	for(int i=0;i<9;i++){
		if(i%3==0){
			printf("-------------\n");
		}
		for(int j=0;j<9;j++){
			if(j%3==0||j==9){
				printf("|");
			}
			printf("%d",board[i][j]);
		}
		printf("|\n");
	}printf("-------------\n"); 
	
	return 0;
	}