Advent of Code 2018 - C#

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This is the first year I'm participating in the advent of code programming challenges.

I intend to solve the puzzles with C# and Linqpad 5, just because that's the configuration I'm most confortable at writing small one-off scripts.

If you haven't solved them by yourself be aware that clicking on the days below will spoiler the solutions and the second daily challenges...

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made with vanilla PHP and MySQL, no frameworks, no bootstrap, no unnecessary* javascript