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| ["+3", "+3", "+4", "-2", "-4"] # example input | |
| |> Enum.map(&String.to_integer/1) | |
| |> Stream.cycle() | |
| |> Stream.scan(&(&1 + &2)) | |
| |> Enum.reduce_while(MapSet.new([0]), fn x, acc -> | |
| if MapSet.member?(acc, x), do: {:halt, x}, else: {:cont, MapSet.put(acc, x)} | |
| end) |
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