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:
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