Omid - Challenge 116

data-challenges
advanced-exercises
🔰 Result A B C D E F Question
Published

March 24, 2026

Illustration for Omid - Challenge 116

Challenge Description

🔰 Result A B C D E F Question

Solutions

library(tidyverse)
library(readxl)

path = "files/CH-116 Remove rows and colums.xlsx"
input = read_excel(path, range = "B2:H8") %>%
  column_to_rownames(var = "...1") %>%
  as.matrix()

test  = read_excel(path, range = "J2:M5") %>%
  column_to_rownames(var = "...1") %>%
  as.matrix()

result = input[seq(1, nrow(input), 2), seq(1, ncol(input), 2)]

all.equal(result, test)  
#> [1] 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
import numpy as np

path = "CH-116 Remove rows and colums.xlsx"
input = pd.read_excel(path, usecols="C:H", skiprows = 1, nrows = 7).to_numpy()
test = pd.read_excel(path, usecols="K:M", skiprows = 1, nrows = 3).to_numpy()
result = input[::2,::2]

print(np.array_equal(result, 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.