go: add solution for year 2015, day 03 #10
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This is all that will be needed for day 03, but will most likely come in handy in later puzzles as well.
Hell yeah, foresight baby!
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This puzzle was fairly simple: just keep track of several discrete "travelers", and the points they have visited.
Benchmarks (
go test -bench=Day03 ./internal/year2015):