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@@ -1,6 +1,6 @@ # 1️⃣🐝🏎️ The One Billion Row Challenge -_Status Jan 1: This challenge is open for submissions!_ +_Status Jan 1: This challenge is [open for submissions](https://www.morling.dev/blog/one-billion-row-challenge/)!_ The One Billion Row Challenge (1BRC) is a fun exploration of how far modern Java can be pushed for aggregating one billion rows from a text file. Grab all your (virtual) threads, reach out to SIMD, optimize your GC, or pull any other trick, and create the fastest implementation for solving this task! @@ -119,6 +119,10 @@ If you want to use a build not available via these channels, reach out to discus * Implementations must be provided as a single source file * The computation must happen at application _runtime_, i.e. you cannot process the measurements file at _build time_ (for instance, when using GraalVM) and just bake the result into the binary +* Input value ranges are as follows: + * Station name: non null UTF-8 string of min length 1 character and max length 100 characters + * Temperature value: non null double between -99.9 (inclusive) and 99.9 (inclusive), always with one fractional digit +* Implementations must not rely on specifics of a given data set, e.g. any valid station name as per the constraints above and any data distribution (number of measurements per station) must be supported ## Entering the Challenge |