24 lines
723 B
Erlang
24 lines
723 B
Erlang
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-module(day1).
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-export([main/0]).
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main() ->
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{ok, Content} = file:read_file("input.txt"),
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Lines = string:split(string:trim(Content), "\n", all),
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{List1, List2} = lists:foldl(fun parse_line/2, {[], []}, Lines),
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SortedList1 = lists:sort(List1),
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SortedList2 = lists:sort(List2),
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Distance = calculate_distance(SortedList1, SortedList2),
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io:format("Result: ~p~n", [Distance]).
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parse_line(Line, {Acc1, Acc2}) ->
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[Str1, Str2] = string:split(string:trim(Line), " ", all),
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{Num1, _} = string:to_integer(Str1),
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{Num2, _} = string:to_integer(Str2),
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{[Num1 | Acc1], [Num2 | Acc2]}.
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calculate_distance(List1, List2) ->
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lists:sum([abs(A - B) || {A, B} <- lists:zip(List1, List2)]).
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