Yes, this year I redid all my solutions in our own language (been working on it for 2 years with a friend) after submitting; to test how will it works for these cases. I must say, next year we'll definitely do it fully in our language.
Re:Advent of Code Surveys: Results
by jeroenheijmans on Friday December 24, 2021 @04:26AM
(#29671967)
That's absolutely amazing!!
And 3 respondents answered they use their own custom language :O