Pivot Records

A hard Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

hard

Problem

A pivot step reshapes a flat list of row-col-value records into a nested lookup structure. Each record is a dict with 'row', 'col', and 'val' keys. Return a nested dict of the form {row: {col: val}}.

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