CodingEasycod-g1224

Subject Data wranglingLevel Entry–Mid~10 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An HR roster stores one employee per row as "name,dept,year" where year is the four-digit hire year. For a headcount report, count how many employees are in department `dept` AND were hired in year `since_year` or later. Example: rows ["ava,eng,2023", "raj,sales,2024", "mia,eng,2025"] with dept "eng" and since_year 2024 give 1.

Implement

count_hires(rows: list[str], dept: str, since_year: int) → int

Examples

in[["ava,eng,2023","raj,sales,2024","mia,eng,2025"],"eng",2024]out1

What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

Learn the concepts

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.