A full (slow) solution to the Billion Row Challenge

We've been picking off small sub-tasks of the Billion Row Challenge, which asks us to summarise a large amount of data as quickly as we can. This time we complete the whole challenge, but in a slow way, to make sure we understand it. In future videos we will attack the last remaining sub-tasks, which concern how to collect together the information (probably in a hashmap) and print a summary.

The code is at https://codeberg.org/andybalaam/brrmbrrm

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