Omid - Challenge 312

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

March 24, 2026

Illustration for Omid - Challenge 312

Challenge Description

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

Solutions

library(tidyverse)
library(readxl)

path = "files/300-399/312/CH-312 Remove Duplicate Values.xlsx"
input = read_excel(path, range = "B2:E11")
test  = read_excel(path, range = "G2:J7")

result = input %>%
  rowwise() %>%
  mutate(set = list(sort(unique(c_across(-ID))))) %>%
  ungroup() %>%
  distinct(set, .keep_all = TRUE) %>%
  select(-set)

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
import numpy as np

path = "300-399/312/CH-312 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=5).rename(columns=lambda c: c.replace('.1', ''))

cols = [c for c in input.columns if c != "ID"]
input["set"] = input[cols].apply(lambda r: tuple(sorted(set(v for v in r if pd.notnull(v)))), axis=1)
result = input.drop_duplicates("set").drop("set", axis=1).reset_index(drop=True)

print(result.equals(test))

  • Logic:

    • Reads the workbook ranges needed for the challenge

    • Applies the rule iteratively until the output stabilizes

  • 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.