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#define DEBUG
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <iomanip>
#include <algorithm>
#include <vector>
using namespace std;
class cell{
bool m_occu; //occupied is shown '-'
int m_num; // number is shown
public:
cell() : m_occu(false), m_num(0) {}
void setMark(const int num){m_num = num; m_occu = true;}
bool isMarked() const { return m_occu; }
int getNum(){ return m_num;}
friend ostream& operator << (ostream& o, const cell& c){
if (!c.m_occu) return o << setw(2) << '-';
else if (c.m_num == 0) return o << setw(2) << '-';
return o << setw(2) << c.m_num;
}
};
class board {
vector<vector <cell> >m_map;
bool col_row;
public:
board() {
vector<cell> a_row(9);
col_row = false;
for (int i = 0; i < 9; i++){
for(int j = 0; j < 9; j++){
a_row[j].setMark(j+1);
}
random_shuffle(a_row.begin(), a_row.end());
m_map.push_back(a_row);
}
}
bool setMark(const int num, const int r, const int c){
if (m_map[r][c].isMarked()) return false;
m_map[r][c].setMark(num);
return true;
}
bool isMarked(const int r, const int c) const {return m_map[r][c].isMarked();}
void swap(){
srand(time(0));
int s = rand()% 3 + 1;
if (col_row == false){//swap rows
for (int i = 0; i < s; i++){
int src = rand()%9;
int dst = rand()%9;
while (src == dst){// make sure that src and dst are different
dst = rand()%9;
}
m_map[src].swap(m_map[dst]);
cout<<"Rows " << char('P' + src) << " and " <<char('P' + dst)<< " Switched"<<endl;
}
col_row = true;
}
else // swap columns
{
cell hold;
int src = rand()%9;
int dst = rand()%9;
while (src == dst){// make sure that src and dst are different
dst = rand()%9;
}
for(int j = 0; j < 9; j++){
hold = m_map[j][src];
m_map[j][src] = m_map[j][dst];
m_map[j][dst] = hold;
}
cout<<"columns " << char('A' + src) << " and " << char('A' + dst) << " switched"<<endl;
col_row = false;
}
}
void erase() //To erase elements from any position of the row
{
srand(time(0));
int row = rand()%9; int col = rand()%9;
int num = 0;
m_map[row][col].setMark(num);
}
bool verify(){// check rows
int compareNUM = 0;
for (int row = 0, col = 0; row < 3 && col < 0; row++, col++){
compareNUM = m_map[row][col].getNum();
for (int r = 0, c = 0; r < 3 && c < 3; r++, c++){
if(m_map[r][c].getNum() == compareNUM){cout << "Error" << endl; return false;}
else return true;
}
}
for (int row = 0, col = 3; row < 3 && col < 6; row++, col++){
compareNUM = m_map[row][col].getNum();
for (int r = 0, c = 3; r < 3 && c < 6; r++, c++){
if(m_map[r][c].getNum() == compareNUM){cout << "Error" << endl; return false;}
else return true;
}
}
for (int row = 0, col = 6; row < 3 && col < 9; row++, col++){
compareNUM = m_map[row][col].getNum();
for (int r = 0, c = 6; r < 3 && c < 9; r++, c++){
if(m_map[r][c].getNum() == compareNUM){cout << "Error" << endl; return false;}
else return true;
}
}
for (int row = 3, col = 0; row < 6 && col < 3; row++, col++){
compareNUM = m_map[row][col].getNum();
for (int r = 3, c = 0; r < 6 && c < 3; r++, c++){
if(m_map[r][c].getNum() == compareNUM){cout << "Error" << endl; return false;}
else return true;
}
}
return false;
}
friend ostream& operator << (ostream& o, const board& b){
cout << " ";
for (int col = 0; col < 9; ++col) o << setw(2) << char('A' + col);
o << endl;
for (int row = 0; row < 9; ++row){
o << setw(2) << char('P' + row);
for (int col = 0; col < 9; ++col) o << b.m_map[row][col];
o << endl;
}
return o;
}
};
int main() {
board b;
string command;
cout<<"Welcome to Sudoku Initializer!"<<endl;
while(true)
{
cin>>command;
if (command == "show") cout << b << endl;
else if (command == "swap") b.swap();
else if (command == "verify")b.verify();
else if (command == "erase") b.erase();
else if (command == "quit"){cout << "Bye "<< endl; break;}
}
return 0;
}
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