Familiar Faces

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

Domain

Python

Difficulty

easy

Seniority

L3

Problem

We're auditing a production log with millions of integer event codes, and we need to know how often the same code recurs across it. Return the number of position pairs that hold the same code.

Summary

The same signals keep coming back. Count how often they meet.

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