Use a set called seen and a list called unique to deduplicate ids while preserving order

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

Domain

Python

Difficulty

medium

Problem

Use a set called seen and a list called unique to deduplicate ids while preserving order. Loop through ids: if an id is not in seen, add it to seen and append it to unique. Print the unique list, then its length.

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