Delete and Earn

You are given an integer array `nums`. You want to maximize the number of points you get by performing the following operation any number of times: - Pick any `nums[i]` and delete it to earn `nums[i]` points. Afterwards, you must delete every element equal to `nums[i] - 1` and **every** element equal to `nums[i] + 1`. Return _the **maximum number of points** you can earn by applying the above operation some number of times_.   **Example 1:** **Input:** nums = [3,4,2] **Output:** 6 **Explanation:** You can perform the following operations: - Delete 4 to earn 4 points. Consequently, 3 is also deleted. nums = [2]. - Delete 2 to earn 2 points. nums = []. You earn a total of 6 points. ``` **Example 2:** **Input:** nums = [2,2,3,3,3,4] **Output:** 9 **Explanation:** You can perform the following operations: - Delete a 3 to earn 3 points. All 2's and 4's are also deleted. nums = [3,3]. - Delete a 3 again to earn 3 points. nums = [3]. - Delete a 3 once more to earn 3 points. nums = []. You earn a total of 9 points. ```   **Constraints:** - `1 <= nums.length <= 2 * 104` - `1 <= nums[i] <= 104`