30 lines
23 KiB
Erlang
30 lines
23 KiB
Erlang
-module(day11).
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-export([start/0]).
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steps(X, Y)
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-> lists:max([abs(X), abs(Y), abs((-1 * X) - Y)]).
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count_steps(Input)
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-> count_steps(re:split(Input, ","), 0, 0, 0).
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count_steps([], X, Y, MaxSteps)
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-> {X, Y, steps(X, Y), lists:max([MaxSteps, steps(X, Y)])};
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count_steps([Head|Tail], X, Y, MaxSteps)
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when Head == <<"nw">> -> count_steps(Tail, X - 1, Y, lists:max([MaxSteps, steps(X, Y)]));
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count_steps([Head|Tail], X, Y, MaxSteps)
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when Head == <<"n">> -> count_steps(Tail, X, Y - 1, lists:max([MaxSteps, steps(X, Y)]));
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count_steps([Head|Tail], X, Y, MaxSteps)
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when Head == <<"ne">> -> count_steps(Tail, X + 1, Y - 1, lists:max([MaxSteps, steps(X, Y)]));
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count_steps([Head|Tail], X, Y, MaxSteps)
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when Head == <<"sw">> -> count_steps(Tail, X - 1, Y + 1, lists:max([MaxSteps, steps(X, Y)]));
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count_steps([Head|Tail], X, Y, MaxSteps)
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when Head == <<"s">> -> count_steps(Tail, X, Y + 1, lists:max([MaxSteps, steps(X, Y)]));
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count_steps([Head|Tail], X, Y, MaxSteps)
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when Head == <<"se">> -> count_steps(Tail, X + 1, Y, lists:max([MaxSteps, steps(X, Y)])).
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start()
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-> io:fwrite("~p~n", [count_steps("ne,ne,ne")]),
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io:fwrite("~p~n", [count_steps("ne,ne,sw,sw")]),
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io:fwrite("~p~n", [count_steps("ne,ne,s,s")]),
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io:fwrite("~p~n", [count_steps("se,sw,se,sw,sw")]),
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io:fwrite("~p~n", 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