Omid - Challenge 93

data-challenges
advanced-exercises
🔰 Question Result Department Marketing IT Production R&D Year
Published

March 24, 2026

Illustration for Omid - Challenge 93

Challenge Description

🔰 Question Result Department Marketing IT Production R&D Year

Solutions

library(tidyverse)
library(readxl)

path = "files/CH-093 Random Selection.xlsx"
input = read_excel(path, range = "B2:C20")
test  = read_excel(path, range = "E2:F7")

result = input %>%
  slice_sample(n = 1, by = Department)

# A tibble: 5 × 2
# Department `Staff ID`
# <chr>      <chr>     
# 1 HR         S_01      
# 2 Marketing  S_03      
# 3 IT         S_10      
# 4 Production S_16      
# 5 R&D        S_15

  • Logic:

    • Reads the workbook ranges needed for the challenge

  • Strengths:

    • The R solution stays close to the workbook rule and keeps the transformation compact.

  • Areas for Improvement:

    • The code assumes the sheet structure and source ranges remain stable.

  • Gem:

    • The strongest part of the solution is choosing the right intermediate representation before shaping the final output.
import pandas as pd

path = "CH-093 Random Selection.xlsx"
input = pd.read_excel(path, usecols= "B:C", skiprows=1)

result = input.groupby("Department").apply(lambda x: x.sample(1)).reset_index(drop=True)

#    Department Staff ID
# 0          HR     S_01
# 1          IT     S_12
# 2   Marketing     S_03
# 3  Production     S_16
# 4         R&D     S_14

  • Logic:

    • Reads the workbook ranges needed for the challenge

    • Aggregates or ranks values at the relevant grouping level

  • Strengths:

    • The Python version follows the same rule in a direct dataframe-oriented implementation.

  • Areas for Improvement:

    • The code assumes the workbook layout remains stable, so any sheet redesign would require small adjustments.

  • Gem:

    • The implementation stays close to the original workbook rule instead of adding unnecessary abstraction.

Difficulty Level

This task is moderate:

  • The business rule is readable, but the workbook still requires careful implementation to reach the expected layout.