Crispo - Excel Challenge 40 2025

excel-challenges
weekly-exercises
Easy Sunday Excel Challenge
Published

October 5, 2025

Illustration for Crispo - Excel Challenge 40 2025

Challenge Description

Easy Sunday Excel Challenge

⭐ Problem Solution Cost Codes Consecutive Easy Sunday Excel Challenge 15-70

Solutions

library(tidyverse)
library(readxl)

path = "files/2025-10-05/Challenge 65.xlsx"
input = read_excel(path, range = "B2:B14")
test  = read_excel(path, range = "D2:D14")

result = input %>%
  mutate(cid = consecutive_id(`Cost Codes`)) %>%
  mutate(gr_n = n(), .by = cid) %>%
  mutate(Consecutive = ifelse(gr_n > 1, T, F)) %>%
  select(Consecutive)

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

  • Logic:

    • Reads the workbook range needed for the challenge

    • Builds the intermediate helper columns that drive the final answer

  • Strengths:

    • The R solution stays compact and mirrors the workbook logic closely.

  • Areas for Improvement:

    • The code assumes the workbook layout and named ranges remain stable.

  • Gem:

    • The best part of the solution is choosing a tidy intermediate shape before producing the final answer.
import pandas as pd

path = "files/2025-10-05/Challenge 65.xlsx"
input = pd.read_excel(path, usecols="B", skiprows=1, nrows=13)
test = pd.read_excel(path, usecols="D", skiprows=1, nrows=13)

input['cid'] = (input['Cost Codes'] != input['Cost Codes'].shift()).cumsum()
result = input.assign(
    Consecutive = input.groupby('cid')['Cost Codes'].transform('size') > 1
)[['Consecutive']]

print(result.equals(test)) # True

  • Logic:

    • Reads the workbook range needed for the challenge

    • Aggregates or ranks values at the correct grouping level

    • Builds the intermediate helper columns that drive the final answer

  • Strengths:

    • The Python version keeps the same rule in a direct pandas-oriented workflow.

  • Areas for Improvement:

    • As with the R version, any workbook layout change would require small adjustments.

  • Gem:

    • The implementation stays close to the stated challenge instead of adding unnecessary complexity.

Difficulty Level

This task is easy to moderate:

  • The business rule is readable, but the workbook still needs a few careful transformation steps.