#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <iomanip>
#include <algorithm>
using std::cout;
using std::cin;
using std::string;
using std::stringstream;
using std::vector;
using std::setw;

// Just draw the board

int main( void ) {
   char grid[10][10];
   for (int i=0; i < 10; ++i)
      for (int j=0; j < 10; ++j)
         grid[i][j] = '-';

   cout << "  ";
   for (int i=0; i < 10; ++i)
      cout << i << ' ';
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i << ' ';
      for (int j=0; j < 10; ++j)
         cout << grid[i][j] << ' ';
      cout << '\n';
   }
}

  0 1 2 3 4 5 6 7 8 9 
0 - - - - - - - - - - 
1 - - - - - - - - - - 
2 - - - - - - - - - - 
3 - - - - - - - - - - 
4 - - - - - - - - - - 
5 - - - - - - - - - - 
6 - - - - - - - - - - 
7 - - - - - - - - - - 
8 - - - - - - - - - - 
9 - - - - - - - - - - 



// Encapsulate the drawing of the board

char grid[10][10];

void draw_board() {
   cout << "  ";
   for (int i=0; i < 10; ++i)
      cout << i << ' ';
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i << ' ';
      for (int j=0; j < 10; ++j)
         cout << grid[i][j] << ' ';
      cout << '\n';
   }
}

int main( void ) {
   for (int i=0; i < 10; ++i)
      for (int j=0; j < 10; ++j)
         grid[i][j] = '-';

   draw_board();
}



// Randomly compute target X and Y

char grid[10][10];

void draw_board() {
   cout << "  ";
   for (int i=0; i < 10; ++i)
      cout << i << ' ';
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i << ' ';
      for (int j=0; j < 10; ++j)
         cout << grid[i][j] << ' ';
      cout << '\n';
   }
}

int main( void ) {
   int target_row, target_col;
   srand( time( 0 ) );
   target_row = rand() % 10;
   target_col = rand() % 10;
   cout << "target_row " << target_row << ", target_col " << target_col << '\n';
   for (int i=0; i < 10; ++i)
      for (int j=0; j < 10; ++j)
         grid[i][j] = '-';

   draw_board();
}



// Prompt for input and compute the delta X plus delta Y

string grid[10][10];

void draw_board() {
   cout << ' ';
   for (int i=0; i < 10; ++i)
      cout << "  " << i;
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i;
      for (int j=0; j < 10; ++j)
         cout << "  " << grid[i][j];
      cout << '\n';
   }
}

int main( void ) {
   int target_row, target_col, row, col;
   srand( time( 0 ) );
   target_row = rand() % 10;
   target_col = rand() % 10;
   cout << "target_row " << target_row << ", target_col " << target_col << '\n';
   for (int i=0; i < 10; ++i)
      for (int j=0; j < 10; ++j)
         grid[i][j] = '-';

   draw_board();
   while (1) {
      cout << "row col ... ";
      cin >> row >> col;
      stringstream ss;
      ss << abs(target_row - row) + abs(target_col - col);
      grid[row][col] = ss.str();
      draw_board();
   }
}



// Use setw() to right-justify

string grid[10][10];

void draw_board() {
   cout << ' ';
   for (int i=0; i < 10; ++i)
      cout << setw(3) << i;
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i;
      for (int j=0; j < 10; ++j)
         cout << setw(3) << grid[i][j];
      cout << '\n';
   }
}

int main( void ) {
   int target_row, target_col, row, col;
   srand( time( 0 ) );
   target_row = rand() % 10;
   target_col = rand() % 10;
   for (int i=0; i < 10; ++i)
      for (int j=0; j < 10; ++j)
         grid[i][j] = '-';

   draw_board();
   while (1) {
      cout << "row col ... ";
      cin >> row >> col;
      stringstream ss;
      ss << abs(target_row - row) + abs(target_col - col);
      grid[row][col] = ss.str();
      draw_board();
   }
}



// Use sprintf() instead

string grid[10][10];

void draw_board() {
   cout << ' ';
   for (int i=0; i < 10; ++i)
      cout << setw(3) << i;
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i;
      for (int j=0; j < 10; ++j)
         cout << setw(3) << grid[i][j];
      cout << '\n';
   }
}

int main( void ) {
   int target_row, target_col, row, col;
   srand( time( 0 ) );
   target_row = rand() % 10;
   target_col = rand() % 10;
   for (int i=0; i < 10; ++i)
      for (int j=0; j < 10; ++j)
         grid[i][j] = '-';

   char delta[6];
   draw_board();
   while (1) {
      cout << "row col ... ";
      cin >> row >> col;
      sprintf( delta, "%d", abs(target_row - row) + abs(target_col - col) );
      grid[row][col] = delta;
      draw_board();
   }
}



// Replace 2D array with vector of vectors

vector<vector<string> > grid(10);

void draw_board() {
   cout << ' ';
   for (int i=0; i < 10; ++i)
      cout << setw(3) << i;
   cout << '\n';
   for (int i=0; i < 10; ++i) {
      cout << i;
      for (int j=0; j < 10; ++j)
         cout << setw(3) << grid[i][j];
      cout << '\n';
   }
}

int main( void ) {
   int target_row, target_col, row, col;
   srand( time( 0 ) );
   target_row = rand() % 10;
   target_col = rand() % 10;
   vector<string> grid_row( 10, "-" );
   for (int i=0; i < 10; ++i)
      grid[i] = grid_row;

   char delta[6];
   draw_board();
   while (1) {
      cout << "row col ... ";
      cin >> row >> col;
      sprintf( delta, "%d", abs(target_row - row) + abs(target_col - col) );
      grid[row][col] = delta;
      draw_board();
   }
}



// Encapsulate the game in a class

class Grid_Game {
   vector<vector<string> > grid;
   int target_row, target_col;
public:
   Grid_Game() {
      srand( time( 0 ) );
      target_row = rand() % 10;
      target_col = rand() % 10;
      vector<string> grid_row( 10, "-" );
      for (int i=0; i < 10; ++i)
         grid.push_back( grid_row );
      draw_board();
   }
   void draw_board() {
      cout << ' ';
      for (int i=0; i < 10; ++i)
         cout << setw(3) << i;
      cout << '\n';
      for (int i=0; i < 10; ++i) {
         cout << i;
         for (int j=0; j < 10; ++j)
            cout << setw(3) << grid[i][j];
         cout << '\n';
      }
   }
   void make_guess( int row, int col ) {
      char delta[6];
      sprintf( delta, "%d", abs(target_row - row) + abs(target_col - col) );
      grid[row][col] = delta;
      draw_board();
   }
};

int main( void ) {
   Grid_Game game;
   int row, col;
   while (1) {
      cout << "row col ... ";
      cin >> row >> col;
      game.make_guess( row, col );
   }
}

row col ... 3 3
   0  1  2  3  4  5  6  7  8  9
0 15  -  -  -  -  -  -  -  -  -
1  - 13  -  -  -  -  -  -  -  -
2  -  - 11  -  -  -  -  -  -  -
3  -  -  -  9  -  -  -  -  -  -
4  -  -  -  -  -  -  -  -  -  -
5  -  -  -  -  -  -  -  -  -  -
6  -  -  -  -  -  -  -  -  -  -
7  -  -  -  -  -  -  -  -  -  -
8  -  -  -  -  -  -  -  2  -  -
9  -  -  -  -  -  -  0  -  -  3