Problem 61021. The Case of the Missing Prototype – Check the Lab’s Logbook for Suspicious Late-Night Entries

After counting the fingerprints, you turn your attention to the security logbook.It records the entry hours (from 0 to 23) of everyone who accessed the Innovation Lab.As per lab policy, no one is allowed inside after 9 PM (21 hours).Every suspicious late-night entry could reveal a key suspect!
Your task is to determine how many entries occurred during these restricted hours.
Given a numeric vector entries, return the number of times people entered the lab at or after 21.
Solve

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53.85% Correct | 46.15% Incorrect
Last Solution submitted on Oct 23, 2025

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