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Distribute Coins in Binary Tree
Count minimum moves to distribute coins evenly by tracking excess/deficit coins flowing through each edge.
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Kth Ancestor of a Tree Node
Find the Kth ancestor of any tree node in O(log k) per query using binary lifting (sparse table DP).
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Binary Tree Maximum Path Sum
Find the maximum path sum in a binary tree where the path can start and end at any node.
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Serialize and Deserialize Binary Tree
Serialize a binary tree to string and back using BFS level-order or DFS preorder with null markers.
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Maximum Sum BST in Binary Tree
Find the maximum sum of any BST subtree within a binary tree using post-order DFS returning subtree metadata.
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