dsa1 min read
Find Duplicate Subtrees — Serialize + HashMap
Find all duplicate subtrees by serializing each subtree and tracking serialization counts in a hash map.
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Serialization
3 articles
dsa2 min read
Encode and Decode Strings — Delimiter and Length-Prefix Schemes
Design an encode/decode scheme for a list of strings. Length-prefix encoding (4-byte header per string) is collision-proof unlike delimiter-based approaches.
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dsa2 min read
Meta — Serialize and Deserialize Binary Tree (BFS/Preorder)
Serialize a binary tree to a string and deserialize it back. Meta loves this problem for testing tree traversal and string parsing. Both BFS and preorder DFS approaches shown.
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