Crispo - Excel Challenge 37 2025

excel-challenges
weekly-exercises
Easy Sunday Excel Challenge
Published

September 14, 2025

Illustration for Crispo - Excel Challenge 37 2025

Challenge Description

Easy Sunday Excel Challenge

⭐ Quantity Stem Leaf Easy Sunday Excel Challenge ⭐ Create a Stem & Leaf Plot ⭐Solution should be dynamic

Solutions

library(tidyverse)
library(readxl)

path = "files/2025-09-14/challenge 60.xlsx"
input = read_excel(path, range = "B2:B18")
test  = read_excel(path, range = "D2:E9")

result = input %>%
  mutate(Stem = Quantity %/% 10, 
         Leaf = Quantity %% 10) %>%
  arrange(Stem, Leaf) %>%
  summarise(Leaf = paste(Leaf, collapse = " "), .by = Stem) 
  
all.equal(result, test)
# [1] 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 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/2025-09-14/challenge 60.xlsx"

input = pd.read_excel(path, usecols="B", skiprows=1, nrows=17)
test = pd.read_excel(path, usecols="D:E", skiprows=1, nrows=7)

input['Stem'] = (input['Quantity'] // 10)
input['Leaf'] = (input['Quantity'] % 10)
input = input.sort_values(['Stem', 'Leaf'])
input = input.astype(str)
result = input.groupby('Stem')['Leaf'].apply(' '.join).reset_index()

print(pd.concat([test, result], axis=1))

  • Logic:

    • Reads the workbook range needed for the challenge

    • Aggregates or ranks values at the correct grouping level

  • 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.