Practice Coding Question | Real Coding Interviews | Hack2hire

NewML System Design & SQL tracks just landedSee what's new

Question Bank Pricing Blog Forum

Quick Summary

Filter out messages containing any forbidden keyword in their text body.
Keyword matching is case-insensitive and requires exact space-delimited token boundaries.
Return remaining safe messages while preserving their original order.

What This Tests

String tokenization and boundary awareness
Case normalization techniques
Constant-time lookup using hash sets
Early-exit optimization during iteration

Common Patterns

Hashing

Trie

Accepted

109/240

Acceptance Rate45.4%

Test Cases

Input

messages =

unsafeWords =

Output

Expected