Omid - Challenge 302

data-challenges
advanced-exercises
🔰 Question ID Value 1 Value 2 Value 3 A B C
Published

March 24, 2026

Illustration for Omid - Challenge 302

Challenge Description

🔰 Question ID Value 1 Value 2 Value 3 A B C

Solutions

library(tidyverse)
library(readxl)

path = "files/300-399/302/CH-302 Remove Duplicate Values.xlsx"
input = read_excel(path, range = "B2:E11")
test  = read_excel(path, range = "G2:J8")

result = input %>%
  mutate(all_sorted = paste(sort(c_across(starts_with("Value"))), collapse = ","), .by = ID) %>%
  distinct(all_sorted, .keep_all = TRUE) %>%
  select(-all_sorted)

all.equal(result, test)
# [1] TRUE

  • Logic:

    • Reads the workbook ranges needed for the challenge

    • Builds the intermediate columns that drive the final result

  • 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 = "300-399/302/CH-302 Remove Duplicate Values.xlsx"
input = pd.read_excel(path, usecols="B:E", skiprows=1, nrows=10)
test = pd.read_excel(path, usecols="G:J", skiprows=1, nrows=6).rename(columns=lambda col: col.replace('.1', ''))

input['all_sorted'] = input.filter(like="Value").apply(lambda r: ','.join(map(str, sorted(r))), axis=1)
result = input.drop_duplicates('all_sorted').drop('all_sorted', axis=1).reset_index(drop=True)

print(result.equals(test)) # 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.