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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm actually pretty proud of how I solved that one with a single array that mapped each index to the next value (i.e. an implicit linked list) (takes 26s on my machine, so I'm sure there's faster ways of doing it but it ended up as a fairly simple solution).
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