Log Alerting System

Problem

Design a system that ingests log messages with a timestamp, and alerts if more than K "ERROR" messages occur in the past W seconds (sliding window).

Expose:

log(timestamp: int, level: str) — level can be "INFO" or "ERROR"

should_alert(timestamp: int) -> bool — return True if more than K errors seen in last W seconds

Constraints

You may assume timestamps are increasing

Use a sliding window with a deque

Parameters

K = 3, W = 10

Test Case 1 system.log(1, "ERROR") system.log(2, "INFO") system.log(3, "ERROR") system.log(4, "ERROR") print(system.should_alert(5)) # True (3 errors in 10s) system.log(15, "ERROR") print(system.should_alert(15)) # False (window 5–15 has only 1 error)