## 740. Delete and Earn

Given an array `nums`

of integers, you can perform operations on the array.

In each operation, you pick any `nums[i]`

and delete it to earn `nums[i]`

points. After, you must delete **every** element equal to `nums[i] - 1`

or `nums[i] + 1`

.

You start with `0`

points. Return the maximum number of points you can earn by applying such operations.

**Example 1:**

Input:nums = [3,4,2]Output:6Explanation:Delete 4 to earn 4 points, consequently 3 is also deleted. Then, delete 2 to earn 2 points. 6 total points are earned.

**Example 2:**

Input:nums = [2,2,3,3,3,4]Output:9Explanation:Delete 3 to earn 3 points, deleting both 2's and the 4. Then, delete 3 again to earn 3 points, and 3 again to earn 3 points. 9 total points are earned.

**Constraints:**

`1 <= nums.length <= 2 * 10`

^{4}`1 <= nums[i] <= 10`

^{4}

## Rust Solution

```
struct Solution;
impl Solution {
fn delete_and_earn(nums: Vec<i32>) -> i32 {
let n = 10001;
let mut sum: Vec<i32> = vec![0; n];
let mut dp: Vec<i32> = vec![0; n];
for x in nums {
sum[x as usize] += x;
}
dp[1] = sum[1];
for i in 2..n {
dp[i] = i32::max(sum[i] + dp[i - 2], dp[i - 1]);
}
dp[n - 1]
}
}
#[test]
fn test() {
let nums = vec![3, 4, 2];
let res = 6;
assert_eq!(Solution::delete_and_earn(nums), res);
let nums = vec![2, 2, 3, 3, 3, 4];
let res = 9;
assert_eq!(Solution::delete_and_earn(nums), res);
}
```

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