Collaboration Reach of Each Researcher

PandasHardSenior level~10 min

Problem

You are given a DataFrame `coauthored` (from `coauthored.csv`) with columns `author_a` and `author_b`. Each row records that two researchers co-authored a paper together; the relationship is symmetric (if A worked with B, then B worked with A).

For each researcher, compute their collaboration reach: the number of distinct researchers they have co-authored with, expressed as a percentage of the total number of researchers who appear anywhere in the data, rounded to 2 decimal places. Return columns `author_a` (the researcher) and `reach_pct`, ordered by `author_a` ascending.

Input data

Example rows — the live problem includes the full dataset.

coauthored

author_a	author_b
2	1
1	3
4	1
1	5

Expected output

Your answer should return 5 rows with the columns author_a, reach_pct.

Starter code (Pandas (Python))

import pandas as pd

def collaboration_reach_of_each_researcher(coauthored) -> pd.DataFrame:
    # Your code here
    return coauthored

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