d20p2

20/graphviz.dot

@@ -0,0 +1,58 @@
+hb -> mj
+mx -> mt, NANDxz
+xh -> qc
+tg -> cq
+kp -> NANDxz, nj
+mj -> NANDjj, lv
+cq -> jm
+mt -> sj, NANDxz
+NANDjj -> hb, lz, NANDrk, xv, vj, vh, lv
+rm -> NANDbz, xq
+hx -> NANDbz
+xv -> lz
+xx -> kp, NANDxz
+pt -> vx
+NANDxz -> bq, gr, sj, rv, NANDzf
+vx -> NANDgf, cv
+xb -> NANDxz, bq
+xk -> NANDgf, rd
+lv -> zk
+NANDrk -> NANDgh
+kn -> NANDgf, tz
+NANDgh -> rx
+sj -> vp
+jm -> vm, NANDbz
+rr -> rv, NANDxz
+tz -> rz
+gg -> kn
+NANDcd -> NANDgh
+qc -> kh, NANDbz
+kb -> NANDgf
+vp -> NANDxz, xx
+fb -> NANDbz, tg
+rd -> cp
+qn -> vh, NANDjj
+xr -> NANDjj
+tp -> rm, NANDbz
+cp -> gg
+NANDbz -> NANDqx, cq, xh, fb, tg
+qq -> pt, NANDgf
+xq -> NANDbz, hx
+gx -> NANDjj, qv
+bq -> rr
+cv -> NANDgf, kb
+zk -> NANDjj, xv
+NANDzf -> NANDgh
+NANDqx -> NANDgh
+vh -> gx
+qv -> xr, NANDjj
+lz -> qn
+broadcaster -> fb, xk, gr, vj
+nj -> NANDxz
+gr -> NANDxz, xb
+kh -> tp, NANDbz
+vm -> NANDbz, xh
+rz -> qq, NANDgf
+NANDgf -> tz, NANDcd, rd, xk, pt, cp, gg
+rv -> mx
+vj -> hb, NANDjj

20/part2.pl

@@ -0,0 +1,82 @@
+:- use_module(library(pio)).
+:- use_module(library(dcg/basics)).
+:- initialization(main, main).
+
+% This code was only used to confirm the theory. Don't run it. Look at part2.txt.
+run_until(Circuit, _, Node, State, N) :- member(_-Node-State-_, Circuit), write(N), nl, !.
+run_until(Circuit, Init, Node, State, N) :-
+    maplist(extract(Circuit), [xr, qv, gx, vh, qn, lz, xv, zk, lv, mj, hb, vj], S1),
+    maplist(extract(Circuit), [nj, kp, xx, vp, sj, mt, mx, rv, rr, bq, xb, gr], S2),
+    maplist(extract(Circuit), [hx, xq, rm, tp, kh, qc, xh, vm, jm, cq, tg, fb], S3),
+    maplist(extract(Circuit), [kb, cv, vx, pt, qq, rz, tz, kn, gg, cp, rd, xk], S4),
+    
+    write(N), write(": "),
+    string_codes(Str1, S1), string_codes(Str2, S2), string_codes(Str3, S3), string_codes(Str4, S4),
+    write(Str1), write(" "), write(Str2), write(" "), write(Str3), write(" "), write(Str4), nl,
+    run([Init], Circuit, CircuitNext),
+    NextN is N + 1,
+    run_until(CircuitNext, Init, Node, State, NextN).
+
+extract(Circuit, Cell, AsciiState) :-
+    member(_-Cell-StateX-_, Circuit),
+    AsciiState is StateX + 48.
+
+% code to run one circuit
+run([], Circuit, Circuit) :- !.
+run([Src-Level-Target|Pulses], CircuitIn, CircuitOut) :-
+    (   member(Type-Target-State-Dests, CircuitIn)
+    ->  /*write([Src, Level, Target]), write(" -> "),
+        write([Type, Target, State, Dests]), write(" = "),*/
+        call(Type, Src, Level, State, NewState, Out),
+        send(Target, Out, Dests, AdditionalPulses),
+        % write(NewState-AdditionalPulses), nl,
+        select(Type-Target-State-Dests, CircuitIn,
+            Type-Target-NewState-Dests, Circuit1),
+        append(Pulses, AdditionalPulses, NewPulses),
+        run(NewPulses, Circuit1, CircuitOut)
+    ;   run(Pulses, CircuitIn, CircuitOut)
+    ).
+
+broadcaster(_, l, x, x, l).
+
+ff(_, h, State, State, none).
+ff(_, l, 0, 1, h).
+ff(_, l, 1, 0, l).
+
+nand(Src, Level, State, NewState, OutLevel) :-
+    select(Src-_, State, Src-Level, NewState),
+    (maplist([_-h]>>(true), NewState) ->  OutLevel = l; OutLevel = h).
+
+send(_, none, _, []).
+send(From, Level, Dests, Pulses) :-
+    \+ Level = none,
+    maplist({Level}/[Dest, From-Level-Dest]>>(true), Dests, Pulses).
+
+% input initialization
+prefill_nands([], Circuit, Circuit).
+prefill_nands([_-Src-_-Dests|Nodes], CircuitIn, CircuitOut) :-
+    convlist(
+        {CircuitIn}/[Dest, Dest]>>(member(nand-Dest-_-_, CircuitIn)),
+        Dests, NandDests),
+    foldl(fill_one_nand(Src), NandDests, CircuitIn, Circuit1),
+    prefill_nands(Nodes, Circuit1, CircuitOut).
+
+fill_one_nand(Src, Nand, CIn, COut) :-
+    select(nand-Nand-State-Dests, CIn, nand-Nand-[Src-l|State]-Dests, COut).
+
+% input parsing stuff below
+input(FileName, Circuit) :-
+    phrase_from_file(modules(EmptyCircuit), FileName),
+    prefill_nands(EmptyCircuit, EmptyCircuit, Circuit).
+
+modules([]) --> eos, !.
+modules([Module|Modules]) --> module(Module), "\n", modules(Modules).
+
+module(broadcaster-broadcaster-x-Dests) --> "broadcaster -> ", dests(Dests).
+module(ff-Name-0-Dests) --> "%", node(Name), " -> ", dests(Dests).
+module(nand-Name-[]-Dests) --> "&", node(Name), " -> ", dests(Dests).
+
+dests([Dest]) --> node(Dest).
+dests([Dest|Dests]) --> node(Dest), ", ", dests(Dests).
+
+node(Name) --> string_without(", \n", NameStr), {atom_codes(Name, NameStr)}.

20/part2.txt

@@ -0,0 +1,16 @@
+gh <- [qx, zf, cd, rk]
+
+Each of the 4 wings is a 12-bit counter, with custom resets at...
+
+xr, qv, gx, vh, qn, lz, xv, zk, lv, mj, hb, vj (jj) <- (111010010101) vj, qv, zk, gx, xr, qn, mj 
+nj, kp, xx, vp, sj, mt, mx, rv, rr, bq, xb, gr (xz) <- (111101101011) gr, nj, vp, rr, xb, xx, mt, kp, mx
+hx, xq, rm, tp, kh, qc, xh, vm, jm, cq, tg, fb (bz) <- (111111011001) vm, kh, xq, tp, fb, qc, jm, hx, rm
+kb, cv, vx, pt, qq, rz, tz, kn, gg, cp, rd, xk (gf) <- (111011010001) rz, cv, qq, kb, kn, xk, vx
+
+111010010101 = 3733 
+111101101011 = 3947 
+111111011001 = 4057 
+111011010001 = 3793
+
+All 4 are primes.
+LCD = 226732077152351