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main.c
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main.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void help()
{
puts("Usage:");
printf
("Start the program and make sure u've got a task file in the same folder as the executable. \nAfter starting - wait for a moment, a nd u'l see the result\n");
}
void printCells(int **cells)
{
FILE *file;
if (!file = fopen("solved.txt", "w+")) {
puts("Error reading the solution");
freeAll(cells);
exit(1);
}
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
if (j == 2 || j == 5) {
printf("%d ", cells[i][j]);
}
else {
printf("%d ", cells[i][j]);
}
}
if (i == 2 || i == 5)
puts("\n");
else
puts("");
}
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
fprintf(file, "%d ", cells[i][j]);
}
fprintf(file, "\n");
}
fclose(file);
}
void load(int **cells)
{
FILE *file;
if (!file = fopen("task.txt", "r+")) {
puts("Error reading task file");
freeAll(cells);
exit(1);
}
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
fscanf(file, "%d", &cells[i][j]);
}
}
fclose(file);
}
int rows(int **cells)
{
int repeats = 0;
for (int value = 1; value < 10; value++) {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
if (cells[i][j] == value)
repeats++;
}
if (repeats > 1) {
return 1;
}
repeats = 0;
}
}
return EXIT_SUCCESS;
}
int coloumns(int **cells)
{
int repeats = 0;
for (int value = 1; value < 10; value++) {
for (int j = 0; j < 9; j++) {
for (int i = 0; i < 9; i++) {
if (cells[i][j] == value)
repeats++;
}
if (repeats > 1) {
return 1;
}
repeats = 0;
}
}
return EXIT_SUCCESS;
}
int squares(int **cells)
{
int repeats = 0;
for (int value = 1; value < 10; value++) {
for (int i = 0; i < 9; i += 3) {
for (int j = 0; j < 9; j += 3) {
for (int i1 = i; i1 < i + 3; ++i1) {
for (int j1 = j; j1 < j + 3; ++j1) {
if (cells[i1][j1] == value)
repeats++;
}
}
if (repeats > 1) {
return 1;
}
repeats = 0;
}
}
}
return EXIT_SUCCESS;
}
int checkCells(int **cells)
{
if (rows(cells) == 0) {
if (coloumns(cells) == 0) {
if (squares(cells) == 0)
return 0;
else
return 1;
}
return 1;
}
return 1;
}
int SudokuSolution(int **source, int i, int j)
{
int accepted = 0;
int default_value = 0;
if (j >= 9) {
i++;
j = 0;
}
if (i >= 9)
return 1;
if (source[i][j] != 0)
default_value = 1;
if (default_value)
SudokuSolution(source, i, j + 1);
if (!default_value)
for (int value = 1; value < 10; value++) {
source[i][j] = value;
if (checkCells(source) == 0) {
accepted = 1;
if (SudokuSolution(source, i, j + 1) == 1)
break;
else
accepted = 0;
}
}
if (!accepted && !default_value) {
source[i][j] = 0;
return 0;
}
return 1;
}
void freeAll(int **source)
{
for (int i = 0; i < 9; i++)
free(source[i]);
free(source);
}
int main(int argc, char *argv[])
{
int **cells = (int **) calloc(9, sizeof(int *));
for (int i = 0; i < 9; i++)
cells[i] = (int *) calloc(9, sizeof(int));
if (argc > 1)
if (strcmp(argv[1], "-h") == 0) {
help();
freeAll(cells);
return EXIT_SUCCESS;
}
load(cells);
if (SudokuSolution(cells, 0, 0) == 0) {
puts("Improper task. Try again");
freeAll(cells);
return EXIT_SUCCESS;
} else {
puts("There's the answer:");
printCells(cells);
}
freeAll(cells);
return EXIT_SUCCESS;
}