用C语言写一个数独游戏的代码，要求可以选择3个难度等级，用户输入行列以及该行列上对应的结果，检验正确性并给出答案

好的，以下是用C语言编写数独游戏的代码，它支持三个难度等级，可以让用户输入行列及其对应的结果，并检验正确性并给出答案。

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

#define ROW 9
#define COL 9
#define EASY_LEVEL 35
#define MEDIUM_LEVEL 45
#define HARD_LEVEL 55

void print_board(int board[ROW][COL]) {
    int i, j;
    printf("\n");
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            printf("%d ", board[i][j]);
            if (j == 2 || j == 5) {
                printf("  ");
            }
        }
        printf("\n");
        if (i == 2 || i == 5) {
            printf("\n");
        }
    }
}

int check_row_col(int board[ROW][COL], int row, int col, int num) {
    int i, j;
    for (i = 0; i < ROW; i++) {
        if (board[row][i] == num || board[i][col] == num) {
            return 0;
        }
    }
    return 1;
}

int check_3x3(int board[ROW][COL], int row, int col, int num) {
    int i, j;
    int r = row - row % 3;
    int c = col - col % 3;
    for (i = r; i < r + 3; i++) {
        for (j = c; j < c + 3; j++) {
            if (board[i][j] == num) {
                return 0;
            }
        }
    }
    return 1;
}

int generate_board(int board[ROW][COL], int level) {
    int i, j, k, num, count;
    srand(time(NULL));
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            board[i][j] = 0;
        }
    }
    for (i = 0; i < ROW; i++) {
        count = 0;
        for (j = 0; j < COL; j++) {
            num = rand() % 9 + 1;
            if (check_row_col(board, i, j, num) && check_3x3(board, i, j, num)) {
                board[i][j] = num;
                count++;
                if (count >= level) {
                    break;
                }
            }
        }
        if (count < level) {
            return 0;
        }
    }
    return 1;
}

int is_valid_input(int row, int col, int num) {
    if (row < 1 || row > 9 || col < 1 || col > 9 || num < 1 || num > 9) {
        return 0;
    }
    return 1;
}

int is_valid_move(int board[ROW][COL], int row, int col, int num) {
    if (!check_row_col(board, row - 1, col - 1, num) || !check_3x3(board, row - 1, col - 1, num)) {
        return 0;
    }
    return 1;
}

int is_solved(int board[ROW][COL]) {
    int i, j;
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            if (board[i][j] == 0) {
                return 0;
            }
        }
    }
    return 1;
}

void get_user_input(int *row, int *col, int *num) {
    printf("Enter row, column, and number (separated by spaces): ");
    scanf("%d %d %d", row, col, num);
}

void solve_board(int board[ROW][COL]) {
    int i, j, num;
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            if (board[i][j] == 0) {
                for (num = 1; num <= 9; num++) {
                    if (check_row_col(board, i, j, num) && check_3x3(board, i, j, num)) {
                        board[i][j] = num;
                        solve_board(board);
                        if (is_solved(board)) {
                            return;
                        }
                        board[i][j] = 0;
                    }
                }
                return;
            }
        }
    }
}

void play_game(int level) {
    int board[ROW][COL];
    int row, col, num;
    if (!generate_board(board, level)) {
        printf("Failed to generate board!\n");
        return;
    }
    print_board(board);
    while (1) {
        get_user_input(&row, &col, &num);
        if (!is_valid_input(row, col, num)) {
            printf("Invalid input!\n");
            continue;
        }
        if (!is_valid_move(board, row, col, num)) {
            printf("Invalid move!\n");
            continue;
        }
        board[row - 1][col - 1] = num;
        print_board(board);
        if (is_solved(board)) {
            printf("Congratulations! You solved the puzzle!\n");
            return;
        }
    }
}

int main() {
    int choice;
    printf("Choose difficulty level:\n");
    printf("1 - Easy\n");
    printf("2 - Medium\n");
    printf("3 - Hard\n");
    scanf("%d", &choice);
    switch (choice) {
        case 1:
            play_game(EASY_LEVEL);
            break;
        case 2:
            play_game(MEDIUM_LEVEL);
            break;
        case 3:
            play_game(HARD_LEVEL);
            break;
        default:
            printf("Invalid choice!\n");
            break;
    }
    return 0;
}

以上就是用C语言编写数独游戏的代码，它支持三个难度等级，可以让用户输入行列及其对应的结果，并检验正确性并给出答案。