Triesmedium45 minSoftware Engineer

Catalog Prefix Intent Index

Name: ProdMatch.ai
Availability: InStock

Software Engineer signal: trie + prefix counts in a commerce catalog context. This is a ProdMatch-owned software engineer drill, framed as a May 2026 Salesforce Marketplace simulation, not a copied platform question.

Company context

Salesforce · Marketplace

Freshness

May 2026

Product surface

commerce catalog

ProdMatch interview simulation based on product-team patterns; not a claim of a real company question.

Question

Build a prefix index for commerce catalog. Support insert(term, weight), delete(term), and topPrefix(prefix) returning the best active term by weight then lexicographic order.

Input

A sequence of index operations.

Output

Return values for topPrefix operations.

Constraints

1 <= operations <= 200000
Total characters <= 1000000
Weights can change through reinsertion.

Concepts

invariants
API correctness
graph modelling
trie
prefix counts
autocomplete

insert pay 5, insert payout 7, topPrefix pa -> payout

Approach

Try framing your own approach first. The 30 seconds you think before peeking is where learning happens.

Clean Solution

Reveal the approach first.

How well did you understand?

Your rating tunes when this problem shows up again.

Common Mistakes

Deletion is hard if nodes cache best child; use lazy invalidation or per-node heap when deletes are frequent.
Tie-break lexicographically for deterministic output.

Next Similar Problems

Workflow Prefix Intent Indexhard Search Prefix Intent Indexmedium Checkout Prefix Intent Indexmedium