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Implement Trie (Prefix Tree)
Implement Trie (Prefix Tree) is a tree problem that rewards clean recursion and a crisp definition of what each call returns. Interviewers love it because it reveals your recursive thinking and your edge-case discipline. Once your recursion contract is clear, the implementation becomes almost mechanical.
Meet Allison & Tim
Your AI coaches
Practice coding interviews out loud with real-time voice coaching. Your code actually runs.
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