You are given the root of a binary tree and an integer k.
Return an integer denoting the size of the kth largest perfect binary subtree, or -1 if it doesn't exist.
A perfect binary tree is a tree where all leaves are on the same level, and every parent has two children.
\n\n\n
Example 1:
\n\nInput: root = [5,3,6,5,2,5,7,1,8,null,null,6,8], k = 2
\n\nOutput: 3
\n\nExplanation:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2024/10/14/tmpresl95rp-1.png\")
The roots of the perfect binary subtrees are highlighted in black. Their sizes, in non-increasing order are [3, 3, 1, 1, 1, 1, 1, 1].
\nThe 2nd largest size is 3.
Example 2:
\n\nInput: root = [1,2,3,4,5,6,7], k = 1
\n\nOutput: 7
\n\nExplanation:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2024/10/14/tmp_s508x9e-1.png\")
The sizes of the perfect binary subtrees in non-increasing order are [7, 3, 3, 1, 1, 1, 1]. The size of the largest perfect binary subtree is 7.
Example 3:
\n\nInput: root = [1,2,3,null,4], k = 3
\n\nOutput: -1
\n\nExplanation:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2024/10/14/tmp74xnmpj4-1.png\")
The sizes of the perfect binary subtrees in non-increasing order are [1, 1]. There are fewer than 3 perfect binary subtrees.
\n
Constraints:
\n\n[1, 2000].1 <= Node.val <= 20001 <= k <= 1024给你一棵 二叉树 的根节点 root 和一个整数k。
返回第 k 大的 完美二叉子树 的大小，如果不存在则返回 -1。
完美二叉树 是指所有叶子节点都在同一层级的树，且每个父节点恰有两个子节点。
\n\n\n\n
示例 1：
\n\n输入： root = [5,3,6,5,2,5,7,1,8,null,null,6,8], k = 2
\n\n输出： 3
\n\n解释：
\n\n
完美二叉子树的根节点在图中以黑色突出显示。它们的大小按非递增顺序排列为 [3, 3, 1, 1, 1, 1, 1, 1]。
\n第 2 大的完美二叉子树的大小是 3。
示例 2：
\n\n输入： root = [1,2,3,4,5,6,7], k = 1
\n\n输出： 7
\n\n解释：
\n\n
完美二叉子树的大小按非递增顺序排列为 [7, 3, 3, 1, 1, 1, 1]。最大的完美二叉子树的大小是 7。
示例 3：
\n\n输入： root = [1,2,3,null,4], k = 3
\n\n输出： -1
\n\n解释：
\n\n
完美二叉子树的大小按非递增顺序排列为 [1, 1]。完美二叉子树的数量少于 3。
\n\n
提示：
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