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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
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19
Task/Hamming-numbers/Erlang/hamming-numbers-1.erl Normal file
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list(N) -> array:to_list(element(1, array(N, [2, 3, 5]))).
nth(N) -> array:get(N-1, element(1, array(N, [2, 3, 5]))).
array(N, Primes) -> array(array:new(), N, 1, [{P, 1, P} || P <- Primes]).
array(Array, Max, Max, Candidates) -> {Array, Candidates};
array(Array, Max, I, Candidates) ->
Smallest = smallest(Candidates),
N_array = array:set(I, Smallest, Array),
array(N_array, Max, I+1, update(Smallest, N_array, Candidates)).
update(Val, Array, Candidates) -> [update_(Val, C, Array) || C <- Candidates].
update_(Val, {Val, Ind, Mul}, Array) ->
{Mul*array:get(Ind, Array), Ind+1, Mul};
update_(_, X, _) -> X.
smallest(L) -> lists:min([element(1, V) || V <- L]).

18
Task/Hamming-numbers/Erlang/hamming-numbers-2.erl Normal file
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nth(N, Batch) ->
array:get(N-1, element(1, compact_array(N, Batch, [2, 3, 5]))).
compact_array(Goal, Lim, Primes) ->
{Array, Candidates} = array(Lim, Primes),
compact_array(Goal, Lim, Lim, Array, Candidates).
compact_array(Goal, _, Index, Array, Candidates) when Index > Goal ->
{Array, Candidates};
compact_array(Goal, Lim, Index, Array, Candidates) ->
{N_array, N_candidates} =
array(compact(Array, Candidates), Index + Lim, Index, Candidates),
compact_array(Goal, Lim, Index+Lim, N_array, N_candidates).
compact(Array, L) ->
Index = lists:min([element(2, V) || V <- L]),
Keep = [E || E <- array:sparse_to_orddict(Array), element(1, E) >= Index],
array:from_orddict(Keep).