Add Readme
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README.md
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README.md
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# Advent of Code 2021
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See also [Advent of Code homepage](https://adventofcode.com/2021)
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## Running
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To call the main method via `sbt`, use `sbt run <input_dir> <day> [sample]
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- `<input_dir>` should be a directory containing files named `day1.txt`, `day2.txt`, ...
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- `<day>` is given as a single integer
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- optionally, `[sample]` is the number of a sample input to use (place in the input directory)
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Without a sample input number, the solution for the given day `X` will be run with `<input dir>/day<X>.txt` as input. If a sample input number `S` is given, `<input dir>/day<X>-sample<S>.txt` is used instead.
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Examples:
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```
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# Run day 1 with day1.txt
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sbt "run input/2021 1"
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# Run day 2 with day2-sample1.txt
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sbt "run input/2021 2 1"
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```
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