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Sum Root to Leaf Numbers
Compute the total sum of all root-to-leaf numbers formed by concatenating digits along each path.
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Maximum Width of Binary Tree
Find the maximum width of a binary tree where width is measured from leftmost to rightmost non-null node per level.
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Count Good Nodes in Binary Tree
Count nodes where no node on the root-to-node path has a value greater than the node itself.
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Convert BST to Greater Tree
Replace each node value with the sum of all values greater than or equal to it using reverse in-order traversal.
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Find Duplicate Subtrees
Find all duplicate subtrees by serializing each subtree and using a hash map to detect duplicates.
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