![\"\"](\"https://assets.leetcode.com/uploads/2020/04/02/test_sample_1.png\")
Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X.
Return the number of good nodes in the binary tree.
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Example 1:
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\r\nInput: root = [3,1,4,3,null,1,5]\r\nOutput: 4\r\nExplanation: Nodes in blue are good.\r\nRoot Node (3) is always a good node.\r\nNode 4 -> (3,4) is the maximum value in the path starting from the root.\r\nNode 5 -> (3,4,5) is the maximum value in the path\r\nNode 3 -> (3,1,3) is the maximum value in the path.\r\n\r\n
Example 2:
\r\n\r\n![\"\"](\"https://assets.leetcode.com/uploads/2020/04/02/test_sample_2.png\")
\r\nInput: root = [3,3,null,4,2]\r\nOutput: 3\r\nExplanation: Node 2 -> (3, 3, 2) is not good, because "3" is higher than it.\r\n\r\n
Example 3:
\r\n\r\n\r\nInput: root = [1]\r\nOutput: 1\r\nExplanation: Root is considered as good.\r\n\r\n
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Constraints:
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