# LeetCode — 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`

Solution:

Time Complexity: **O(n)**

Space Complexity: **O(n)**