Find all values that appear more than once in the list

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

Domain

Python

Difficulty

medium

Problem

Find all values that appear more than once in the list. Use a 'seen' set and a 'duplicates' set: for each value, if it is already in seen add it to duplicates, otherwise add it to seen. Print the duplicates as a sorted list.

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