The One-Way Street

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

Domain

Python

Difficulty

easy

Seniority

L3

Problem

You're profiling a numeric column pulled from a metrics export, hunting for the longest stretch where the readings only ever move one way. Given `arr`, return the length of the longest contiguous run that stays entirely non-decreasing or entirely non-increasing.

Summary

The longest stretch that never turns around.

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