My 1billion row challenge solutions in various languages

Clarifying maximum number of distinct station names

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README.md
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* 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
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* 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
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* There is a maximum of 10,000 unique station names
* 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