go: add solution for year 2015, day 04 #11
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The test case for the actual input file is included, since I now have the correct answer.
This was a slow one...
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This was a slow one, due to the fact that the solution can only be brute-forced (as far as I am aware). I tried to make it at least not excruciatingly slow, but I can't be arsed to do a lot of micro-optimizations.
Bencmarks (
go test -bench=Day04 -benchtime=1m ./internal/year2015):