Omid - Challenge 292

data-challenges
advanced-exercises
🔰 : Advanced Filtering!
Published

March 24, 2026

Illustration for Omid - Challenge 292

Challenge Description

🔰 : Advanced Filtering!

Solutions

library(tidyverse)
library(readxl)

path = "files/200-299/292/CH-292 Advanced Filtering.xlsx"
input = read_excel(path, range = "B2:E9")
test  = read_excel(path, range = "G2:G6")

result = input %>%
  rowwise() %>%
  filter(n_distinct(c_across(-ID)) == ncol(across(-ID))) %>%
  ungroup() %>%
  select(ID)
  
all.equal(result$ID, test$`Selected IDs`) # TRUE

  • 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 = "200-299/292/CH-292 Advanced Filtering.xlsx"
input = pd.read_excel(path, usecols="B:E", skiprows=1, nrows=8)
test = pd.read_excel(path, usecols="G", skiprows=1, nrows=4)

result = input[input.drop('ID', axis=1).apply(lambda row: len(set(row)) == len(row), axis=1)][['ID']].reset_index(drop=True)

print(result['ID'].equals(test['Selected IDs'])) # True

  • Logic:

    • Reads the workbook ranges needed for the challenge

  • 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.