LeetCode Card 314 — Trie / Implement
Pattern signal
This pattern usually appears when the prompt involves prefix queries, incremental string matching, or dictionary search across characters. Implement Trie, Word Search II, replace-words, and autocomplete-style prompts point here.
What Implement means here
In BASIC, the Implement step is where you write the code in the same order as the chosen skeleton so the logic stays stable. For Trie, that matters because the pattern only becomes useful once the candidate is explicit about what is being tracked, reduced, or preserved.
Interview move
A strong move is to transcribe the plan instead of improvising. In this pattern family, say out loud what representation makes the problem easier: the map entry, the pointer invariant, the recursion contract, the queue contents, or the DP state. That keeps the implementation attached to a reason.
Common miss
Candidates sometimes use a trie where a hash map would suffice or forget to model terminal words cleanly. BASIC reduces that risk because the stage sequence forces you to earn the implementation instead of jumping straight into it.
BASIC prompt
“Given that this looks like Trie, what is the simplest way to write the code in the same order as the chosen skeleton so the logic stays stable?”