Method isRowSafe

C++/Sudoku-Solver.cpp:11–19

to check whether num is valid in that row

	// to check whether num is valid in that row    
    bool isRowSafe(vector<vector<char>>& board, int row, char  num)
    {
        for(int col = 0;col<9;col++)
        {
            if(board[row][col] == num)
                return true;
        }
        return false;
    }
    
    // to check whether num is valid in that column
    bool isColumnSafe(vector<vector<char>>& board, int col , char  num)