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https://leetcode.com/problems/maximum-sum-bst-in-binary-tree/
<code-python>
class Solution:
    def maxSumBST(self, root: TreeNode) -> int:    
        def dfs(node):
            if not node: return (1e9, -1e9, 0, True)
            ll, lh, ls, lv = dfs(node.left)
            rl, rh, rs, rv = dfs(node.right)
            v = lv and rv and node.val > lh and node.val < rl
            s = ls + rs + node.val if v else -1
            self.ans = max(self.ans, s)
            return (min(ll, node.val), max(rh, node.val), s, v)
        self.ans = 0
        dfs(root)
        return self.ans
</code-python>