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#include "StdAfx.h"
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#include ".\sudoku.h"
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#include <exception>
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//bruges til debug prints
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#define LINE "+---+---+---+---+---+---+---+---+---+\r\n"
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Sudoku::Sudoku(void)
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{
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clear();
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}
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Sudoku::~Sudoku(void)
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{
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}
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CString Sudoku::print_matrix()
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{
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CString out;
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int i,j,tal;
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for(i=0; i<matrixSize; i++) {
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out += LINE ;
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for (j=0; j<matrixSize; j++) {
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tal = matrix[j][i];
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if (tal != 0) {
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out.AppendFormat("| %d ", tal);
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}
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else
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out += "| ";
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}
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out += "|\r\n";
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}
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out += LINE ;
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return out;
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}
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void Sudoku::clear()
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{
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for (int i=0; i<matrixSize; i++)
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for (int j=0; j<matrixSize; j++) {
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user_matrix[i][j] = false;
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matrix[i][j] = 0;
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}
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}
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void Sudoku::clearCalculated(void)
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{
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for (int i=0; i<matrixSize; i++)
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for (int j=0; j<matrixSize; j++) {
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if (user_matrix[i][j] == false)
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matrix[i][j] = 0;
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}
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}
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bool Sudoku::checkrow(int x, int y, int tal)
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{
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for (int i=0; i<matrixSize; i++) {
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if (matrix[x][i] == tal)
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return true;
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}
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return false;
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}
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bool Sudoku::checkcol(int x, int y, int tal)
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{
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int i;
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for (i=0; i<matrixSize; i++) {
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if (matrix[i][y] == tal)
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return true;
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}
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return false;
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}
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bool Sudoku::checkbox(int x, int y, int tal)
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{
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int startx,starty;
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startx = x - (x%3);
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starty = y - (y%3);
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for (int row=startx; row<(startx+3); row++)
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for (int col=starty; col<(starty+3); col++)
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if (matrix[row][col] == tal)
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return true;
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return false;
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}
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bool Sudoku::solve(int x, int y)
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{
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int tal;
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bool res;
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if (y >= matrixSize)
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return true;
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if (x >= matrixSize) {
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x=0;
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y++;
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}
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while (user_matrix[x][y] == true) {
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x++;
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if (x>=matrixSize) {
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x=0;
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y++;
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}
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}
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if (y>=matrixSize)
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return true; //out of range
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for (tal=1; tal<=matrixSize; tal++) {
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if ( checkrow(x,y,tal) || checkcol(x,y,tal) || checkbox(x,y,tal) )
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continue;
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matrix[x][y] = tal;
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res = solve(x+1,y);
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if (res == true)
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return res;
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}
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matrix[x][y] = 0; //before stepping back, clear the current field
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return false;
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}
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bool Sudoku::solve()
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{
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clearCalculated();
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initCheck();
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return solve(0,0);
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}
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void Sudoku::setNumber(int x, int y, int number)
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{
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matrix[x][y] = number;
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if (number != 0)
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user_matrix[x][y] = true;
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else
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user_matrix[x][y] = false;
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}
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int Sudoku::getNumber(int x, int y)
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{
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return matrix[x][y];
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}
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bool Sudoku::getUser(int x, int y)
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{
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return user_matrix[x][y];
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}
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// laver en check på om det bruger-indtastede problem kan løses eller om dataene har en intern konflikt
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void Sudoku::initCheck(void)
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{
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int tal;
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bool res;
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for (int i=0; i<matrixSize; i++) {
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for (int j=0; j<matrixSize; j++) {
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if (matrix[i][j] != 0) {
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tal = matrix[i][j];
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matrix[i][j] = 0;
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res= (checkrow(i,j,tal) || checkcol(i,j,tal) || checkbox(i,j,tal));
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matrix[i][j] = tal;
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if (res)
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throw std::exception("Invalid user matrix");
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}
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}
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}
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}
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