Maximum Group Total

← Maximum Group Total hard

dplyr

Write an R function solution(x) that uses dplyr to group x by group, sum the value column within each group, and return the largest group total.

Example

df <- data.frame(group = c("a","a","b","b"), value = c(10, 20, 5, 15))
solution(df)  →  30

solution.py

14px

📊 Test Results

Run your code to see test results here.

Every challenge runs your code by calling a function. You must define a function named solution(...) that returns the answer.

Key rule: use return — not print(). The grader only checks the returned value; anything you print is ignored.

✗ Won't be graded

def solution(a, b):
    print(a + b)

✓ Correct

def solution(a, b):
    return a + b

What the grader sends

Your function is called with the challenge's test inputs, for example:

solution(3, 5)   # expects 8

Match the parameter names and count shown in the challenge description, and always finish with a return.