90 lines
2.7 KiB
Perl
90 lines
2.7 KiB
Perl
|
:- use_module(library(pio)).
|
||
|
|
:- use_module(library(clpfd)).
|
||
|
|
:- initialization(main, main).
|
||
|
|
|
||
|
|
main([FileName|_]) :-
|
||
|
|
input(FileName, Input),
|
||
|
|
concurrent_maplist(row_weight, Rocks, Weights),
|
||
|
|
sum_list(Weights, W),
|
||
|
|
writef('%t\n', [W]).
|
||
|
|
|
||
|
|
row_weight(Row, Weight) :-
|
||
|
|
phrase(rock_counts(Rocks), Row),
|
||
|
|
convlist([N-z-_, N]>>(true), Rocks, RockCounts),
|
||
|
|
sum_list(RockCounts, Weight).
|
||
|
|
|
||
|
|
% North is to the left
|
||
|
|
roll(Map, NewMap) :-
|
||
|
|
concurrent_maplist(collapse, Map, NorthCollapsed),
|
||
|
|
rotate(NorthCollapsed, West),
|
||
|
|
concurrent_maplist(collapse, West, WestCollapsed),
|
||
|
|
rotate(WestCollapsed, South),
|
||
|
|
concurrent_maplist(collapse, South, SouthCollapsed),
|
||
|
|
rotate(SouthCollapsed, East),
|
||
|
|
concurrent_maplist(collapse, East, EastCollapsed),
|
||
|
|
rotate(EastCollapsed, NewMap).
|
||
|
|
|
||
|
|
rotate(Map, NewMap) :-
|
||
|
|
transpose(Map, X),
|
||
|
|
concurrent_maplist(reverse, X, NewMap).
|
||
|
|
|
||
|
|
print(Map) :-
|
||
|
|
rotate(Map, RotMap),
|
||
|
|
append([[_|RealMap], [_]], RotMap),
|
||
|
|
maplist([X]>>(
|
||
|
|
append([_|Y], [_], X),
|
||
|
|
atomics_to_string(Y, S),
|
||
|
|
writef('%t\n', [S])), RealMap),
|
||
|
|
write('\n').
|
||
|
|
|
||
|
|
collapse(Row, NewRow) :-
|
||
|
|
% abolish_private_tables,
|
||
|
|
% table(rock_counts/3), table(condense/3), table(reexpand/3),
|
||
|
|
phrase(rock_counts(Counts), Row),
|
||
|
|
phrase(condense(Zs), Counts),
|
||
|
|
phrase(reexpand(Zs), NewRow),
|
||
|
|
% NewRow = Zs,
|
||
|
|
true.
|
||
|
|
|
||
|
|
reexpand([]) --> eos.
|
||
|
|
reexpand([N-Next|Rocks]) --> ['#'], stack(N, Next), reexpand(Rocks).
|
||
|
|
|
||
|
|
stack(0, 0) --> [], !.
|
||
|
|
stack(0, Z) --> {NextZ is Z - 1}, ['.'], stack(0, NextZ), !.
|
||
|
|
stack(N, Z) --> {NextZ is Z - 1, NextN is N - 1}, ['O'], stack(NextN, NextZ).
|
||
|
|
|
||
|
|
condense([]) --> [0-0-0].
|
||
|
|
condense([N-Next|Rocks]) --> [0-I-I, N-z-Next], condense(Rocks), !.
|
||
|
|
condense(Rocks) --> [_-_-_], condense(Rocks).
|
||
|
|
|
||
|
|
rock_counts([0-0-0]) --> [].
|
||
|
|
rock_counts([LastN-I-LastZ, LastN-LastI-LastZ|Rocks]) -->
|
||
|
|
['.'], rock_counts([LastN-LastI-LastZ|Rocks]),
|
||
|
|
{I is LastI + 1}.
|
||
|
|
rock_counts([N-I-LastZ, LastN-LastI-LastZ|Rocks]) -->
|
||
|
|
['O'], rock_counts([LastN-LastI-LastZ|Rocks]),
|
||
|
|
{I is LastI + 1, N is LastN + 1}.
|
||
|
|
rock_counts([0-I-I, LastN-z-Len, LastN-LastI-LastZ|Rocks]) -->
|
||
|
|
['#'], rock_counts([LastN-LastI-LastZ|Rocks]),
|
||
|
|
{I is LastI + 1, Len is I - LastZ - 1}.
|
||
|
|
|
||
|
|
% North is to the left
|
||
|
|
input(FileName, Input) :-
|
||
|
|
phrase_from_file(lines(Raw), FileName),
|
||
|
|
concurrent_maplist(pad, Raw, PaddedInput),
|
||
|
|
concurrent_maplist(reverse, PaddedInput, Reversed),
|
||
|
|
transpose(Reversed, Rotated),
|
||
|
|
concurrent_maplist(pad, Rotated, Input).
|
||
|
|
|
||
|
|
pad(Row, Rowx) :- append(['#'|Row], ['#'], Rowx).
|
||
|
|
|
||
|
|
lines([]) --> eos, !.
|
||
|
|
lines([Line|Lines]) --> line(Line), lines(Lines).
|
||
|
|
|
||
|
|
line([]) --> "\n"; eos.
|
||
|
|
line(['O'|Chars]) --> "O", line(Chars).
|
||
|
|
line(['.'|Chars]) --> ".", line(Chars).
|
||
|
|
line(['#'|Chars]) --> "#", line(Chars).
|
||
|
|
|
||
|
|
eos([], []).
|