matrix/task 3.c

#include <stdio.h>
#include <stdbool.h>
#define SIZE 9
bool isValidSudoku(int matrix[SIZE][SIZE]);
bool checkRow(int matrix[SIZE][SIZE], int row, int num);
bool checkCol(int matrix[SIZE][SIZE], int col, int num);
bool checkBlock(int matrix[SIZE][SIZE], int startRow, int startCol, int num);
char errorMessage[100];
int main() {
    int sudoku[SIZE][SIZE] = {
        {1, 1, 6, 9, 8, 5, 0, 0, 0},
        {0, 0, 0, 1, 0, 2, 0, 0, 0},
        {2, 3, 0, 0, 5, 7, 6, 0, 4},
        {8, 0, 0, 0, 0, 0, 0, 0, 9},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0}
    };
    printf("The original Sudoku matrix:\n");
    int i,j;
    for (i = 0; i < SIZE; i++) {
        for (j = 0; j < SIZE; j++) {
            printf("%d ", sudoku[i][j]);
        }
        printf("\n");
    }
    if (!isValidSudoku(sudoku)) {
        printf("False: Invalid initial Sudoku matrix!\n");
        if (errorMessage[0] != '\0') { // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD><CEAA>
            printf("%s\n", errorMessage);
        }
    } else {
        printf("True: Valid initial Sudoku matrix!\n");
    }
    return 0;
}bool isValidSudoku(int matrix[SIZE][SIZE]) {
	int row,num;
    for (row = 0; row < SIZE; row++) {
        for (num = 1; num <= 9; num++) {
            if (!checkRow(matrix, row, num)) {
                sprintf(errorMessage, "The number %d in the row %d has been used!", num, row + 1);
                return false;
            }
        }
    }
    int col;
    for (col = 0; col < SIZE; col++) {
        for (num = 1; num <= 9; num++) {
            if (!checkCol(matrix, col, num)) {
                sprintf(errorMessage, "The number %d in the col %d has been used!", num, col + 1);
                return false;
            }
        }
    }
    int startRow,startCol;
    for (startRow = 0; startRow < SIZE; startRow += 3) {
        for (startCol = 0; startCol < SIZE; startCol += 3) {
            for (num = 1; num <= 9; num++) {
                if (!checkBlock(matrix, startRow, startCol, num)) {
                    sprintf(errorMessage, "The number %d in the block %d has been used!", num, (startRow / 3) * 3 + startCol / 3 + 1);
                    return false;
                }
            }
        }
    }
    return true;
}
bool checkRow(int matrix[SIZE][SIZE], int row, int num) {
    int count = 0,col;
    for (col = 0; col < SIZE; col++) {
        if (matrix[row][col] == num) count++;
        if (count > 1) {
            return false;
        }
    }
    return true;
}
bool checkCol(int matrix[SIZE][SIZE], int col, int num) {
    int count = 0,row;
    for (row = 0; row < SIZE; row++) {
        if (matrix[row][col] == num) count++;
        if (count > 1) {
            return false;
        }
    }
    return true;
}
bool checkBlock(int matrix[SIZE][SIZE], int startRow, int startCol, int num) {
    int count = 0,row,col;
    for (row = 0; row < 3; row++) {
        for (col = 0; col < 3; col++) {
            if (matrix[startRow + row][startCol + col] == num) count++;
            if (count > 1) {
                return false;
            }
        }
    }
    return true;
}