Level 4Exercise #91

Running maximum

Return the greatest value seen at each position.

What you’ll practice

This Level 4 exercise focuses on accumulate(max) in the Itertools curriculum. Solve the challenge prompt above using clear, idiomatic Python and the relevant language or standard-library tools.

Relevant Python reference: itertools.accumulate.

Sample Test Cases

Example #1

Input:running_max([3,1,5,4])

Output:[3,3,5,5]

Reference Solution

Reveal Reference Solution

def running_max(values: list[int]) -> list[int]:
    from itertools import accumulate
    return list(accumulate(values, max))

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Running maximum

What you’ll practice

Sample Test Cases

Further Reading

Reference Solution