#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void print_sudoku(char sudoku[9][9]) {
    for (int i = 0; i < 9; i++) {
        if (i % 3 == 0 && i != 0) {
            printf("-------------------------\n");
        }
        for (int j = 0; j < 9; j++) {
            if (j % 3 == 0 && j != 0) {
                printf("| ");
            }
            printf("%c ", sudoku[i][j]);
        }
        printf("\n");
    }
}

int main() {
    char sudoku_board[9][9];

    // 初始化随机数种子
    srand(time(NULL));

    // 生成不完整数独盘
    for (int i = 0; i < 9; i++) {
        for (int j = 0; j < 9; j++) {
            sudoku_board[i][j] = '.';
        }
    }

    for (int i = 0; i < 9; i++) {
        for (int count = 0; count < 3; count++) {
            int j;
            do {
                j = rand() % 9;
            } while (sudoku_board[i][j] != '.');
            int x;
            do {
                x = (rand() % 9) + 1;
            } while (strchr(sudoku_board[i], x + '0'));
            sudoku_board[i][j] = x + '0';
        }
    }

    print_sudoku(sudoku_board);

    return 0;
}