Design and implement a ToDo list system for managing AI tasks. The system maintains a collection of tasks where each task has a unique identifier, a description, and a current status.

Implement the ToDoList class:

• ToDoList() Initializes an empty task list.

• void add(String taskId, String description, String status) Adds a new task with the given identifier, description, and initial status.

• List<String> get(String taskId) Retrieves task information as a list in the format [taskId, description, status]. Returns an empty list if the task does not exist.

• void updateStatus(String taskId, String newStatus) Changes the status of an existing task to the specified new status.

Each task is represented as a three-element list containing the task ID, description, and current status. Valid status values are "READY", "IN_PROGRESS", "SUCCEEDED", and "FAILED".

Constraints:

• 1 ≤ taskId.length, description.length ≤ 100
• Each taskId is unique within the list
• All string inputs are non-null and non-empty
• The number of operations will not exceed 10⁴

Example

Input: ["ToDoList", "add", "add", "get", "updateStatus", "get", "get"] [[], ["task1", "Implement login", "READY"], ["task2", "Write tests", "IN_PROGRESS"], ["task1"], ["task1", "IN_PROGRESS"], ["task1"], ["task3"]]

Output: [null, null, null, ["task1", "Implement login", "READY"], null, ["task1", "Implement login", "IN_PROGRESS"], []]

Explanation:

• ToDoList todoList = new ToDoList();
• todoList.add("task1", "Implement login", "READY");
• todoList.add("task2", "Write tests", "IN_PROGRESS");
• todoList.get("task1"); // Returns ["task1", "Implement login", "READY"]. Retrieve task "task1".
• todoList.updateStatus("task1", "IN_PROGRESS"); /
• todoList.get("task1"); // Returns ["task1", "Implement login", "IN_PROGRESS"].
• todoList.get("task3"); // Returns [].