<|system|>
Given the `root` of a binary tree, return _the same tree where every subtree (of the given tree) not containing a_ `1` _has been removed_.

A subtree of a node `node` is `node` plus every node that is a descendant of `node`.

**Example 1:**

**Input:** root = \[1,null,0,0,1\]
**Output:** \[1,null,0,null,1\]
**Explanation:** 
Only the red nodes satisfy the property  "every subtree not containing a 1 ".
The diagram on the right represents the answer.

**Example 2:**

**Input:** root = \[1,0,1,0,0,0,1\]
**Output:** \[1,null,1,null,1\]

**Example 3:**

**Input:** root = \[1,1,0,1,1,0,1,0\]
**Output:** \[1,1,0,1,1,null,1\]

**Constraints:**

*   The number of nodes in the tree is in the range `[1, 200]`.
*   `Node.val` is either `0` or `1`.
</s>.
<|user|>
Can you answer based on context?
<|assistant|>

def best_rotation(nums):
    n = len(nums)
    change = [0] * n

    for i in range(n):
        change[(i - nums[i] + 1 + n) % n] -= 1
        change[(i + 1) % n] += 1

    max_score = 0
    cur_score = change[0]
    for i in range(1, n):
        cur_score += change[i]
        if cur_score > max_score:
            max_score = cur_score

    return max_score
