hard20 pts · first answer countsarrayssliding-windowsystem-design

Rate limiting with a time window

An API allows each user 100 requests in any rolling 60 seconds. Which per-user structure enforces this exactly?

A.A counter that resets at the start of each clock minuteB.A sorted array of every request time the user ever madeC.A single timestamp recording the user’s last requestD.A queue of timestamps, dropping those over 60 s old

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Rate limiting with a time window

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