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-rw-r--r--2023/25-Snowverload/example13
-rw-r--r--2023/25-Snowverload/first.hs76
-rw-r--r--2023/25-Snowverload/input1256
3 files changed, 1345 insertions, 0 deletions
diff --git a/2023/25-Snowverload/example b/2023/25-Snowverload/example
new file mode 100644
index 0000000..bbfda0b
--- /dev/null
+++ b/2023/25-Snowverload/example
@@ -0,0 +1,13 @@
+jqt: rhn xhk nvd
+rsh: frs pzl lsr
+xhk: hfx
+cmg: qnr nvd lhk bvb
+rhn: xhk bvb hfx
+bvb: xhk hfx
+pzl: lsr hfx nvd
+qnr: nvd
+ntq: jqt hfx bvb xhk
+nvd: lhk
+lsr: lhk
+rzs: qnr cmg lsr rsh
+frs: qnr lhk lsr
diff --git a/2023/25-Snowverload/first.hs b/2023/25-Snowverload/first.hs
new file mode 100644
index 0000000..18063f2
--- /dev/null
+++ b/2023/25-Snowverload/first.hs
@@ -0,0 +1,76 @@
+-- requires cabal install --lib megaparsec parser-combinators heap vector fgl
+-- very slow with runghc, use ghc -O3 -o first first.hs
+module Main (main) where
+
+import Control.Applicative.Permutations
+import Control.Monad (void, when)
+import qualified Data.Char as C
+import Data.Either
+import Data.Function
+import Data.Functor
+import Data.Graph.Inductive
+import qualified Data.Heap as H
+import qualified Data.List as L
+import qualified Data.Map as M
+import Data.Maybe
+import Data.Ratio
+import qualified Data.Set as S
+import Data.Tuple
+import qualified Data.Vector as V
+import qualified Data.Vector.Unboxed as VU
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+
+import Debug.Trace
+
+exampleExpectedOutput = 54
+
+type Input = M.Map String (S.Set String)
+
+type Parser = Parsec Void String
+
+parseLabel :: Parser String
+parseLabel = some letterChar <* optional (char ':') <* optional hspace
+
+parseLine :: Parser (String, S.Set String)
+parseLine = (,) <$> parseLabel
+ <*> (S.fromList <$> some parseLabel)
+
+parseInput' :: Parser Input
+parseInput' = M.fromList <$> (some (parseLine <* eol) <* eof)
+
+parseInput :: String -> IO Input
+parseInput filename = do
+ input <- readFile filename
+ case runParser parseInput' filename input of
+ Left bundle -> error $ errorBundlePretty bundle
+ Right input' -> return input'
+
+compute :: Input -> Int
+compute input = size1 * (order g - size1)
+ where
+ n = L.nub $ M.keys input ++ (S.elems . S.unions $ M.elems input)
+ e = [(from, to) | (from, tos) <- M.assocs input, to <- S.elems tos]
+ n' = zip n [1..]
+ e' = map (\(from, to) -> (fromJust $ L.lookup from n', fromJust $ L.lookup to n', from ++ "-" ++ to)) e
+ g :: Gr String String
+ g = undir $ mkGraph (map swap n') e'
+ size1 = length group1
+ group1 = compute' (nodes g)
+ -- Karger's algorithm to compute a minimum cut
+ -- implementation from https://github.com/jrp2014/AoC2023/blob/main/Day25/Day25.hs#L60
+ compute' :: [Node] -> [Node]
+ compute' s | sum (map count s) == 3 = s
+ | otherwise = compute' (L.delete (L.maximumBy (compare `on` count) s) s)
+ where
+ count :: Node -> Int
+ count ns = length $ suc g ns L.\\ s
+
+main :: IO ()
+main = do
+ example <- parseInput "example"
+ let exampleOutput = compute example
+ when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
+ input <- parseInput "input"
+ print $ compute input
diff --git a/2023/25-Snowverload/input b/2023/25-Snowverload/input
new file mode 100644
index 0000000..7c0486a
--- /dev/null
+++ b/2023/25-Snowverload/input
@@ -0,0 +1,1256 @@
+pxv: xtm lsh jgq
+tgb: jqb rmh fzx
+fnf: mpx lzb vnb sgd lhz
+blx: xrj
+zql: czm kqz gjt rxn
+mzp: fqk
+kjb: nvn flq vbj vzx
+jtx: stq
+ntf: bgg
+lsc: plj ljr
+bzg: rdv
+fjl: hhs fsq kbt jmb
+hzv: cfl smm mtv zkb
+lft: grq btj
+hgc: hnh dff
+rmx: ckz sgj fzz pgh
+tnz: qst vlf ndh
+tsm: vml vgx
+zkb: pvv mng gmr
+gjt: mgv jcj lzc mhz
+kqb: xgm nvb fzj mfb
+pjj: fjb hgp fkb
+msn: rjh fdv
+bnj: fxh xlp
+bjk: gfx cbz fzj qzq
+kzl: jdj
+hxt: dlj ttx
+fvv: mfl tdh sqt
+jgd: nzn blx bxv pkt
+xvx: qkl grq xvz
+dmb: hnh
+hrr: pst bbk
+mzh: mxd knn brg lxh kfn ntf
+vdl: gnr qxm xks fsq qqr
+qrk: kxf jzj fbj szn rfs
+prs: mdd
+bfr: nrf
+sqp: nmt
+gvh: qrv mrm vrc ttd vxh
+lzf: rzq jhr jjd mff
+gpj: pxn
+zqg: rjt cnp dxz
+xgn: mst xjv
+ppr: tkm
+xnp: skq dlz
+mpn: fct nhv vrv hnh
+xsk: cbc phm jmd ngp
+vzm: xlk trg jct
+fmk: mxd ckv psh pzx
+vtv: jmd nbl
+jlv: btf zmh
+rkj: qjx cst jjd cvj
+gzg: dlz sls knn rzc
+sth: tzn cgq qqj plh mvv mrq
+nzz: nbj hql vqc
+vct: hhj gxs zsg hgq
+ckb: zbc phh
+hgp: fzr dkr
+tdh: jjs
+lqd: vrc mxk qlk dlr
+mkh: rtj pgz vzj
+rdl: pnm mst
+stl: hqd lzc dlb
+ghb: xxj hmc
+ppt: psx ngh ssk
+njl: msn gkc rhh vzm
+xgb: ftc plj fnj grf
+xxd: kbt szx cvq hqn
+hms: gxf lkx nvn vhd
+gxf: bjk skd rlh
+ndx: qtr hrt
+dks: fsn
+lzq: csr rjs
+rfx: csv txd qps cnl
+srl: cqv
+vlf: zmh pnq
+fnq: zgb jdk lkb ccn
+dln: ljr ctf
+pdt: lzc phc rzf
+lcs: bhs xtq
+lgm: frz zxr lzc
+vdv: bzg
+mhz: smg
+trj: cjg krh sgj
+prv: msp
+fvj: gpd
+bdz: szn zmt pdk ptd ngh
+sgd: vft hdm
+dds: jdh qqj qdf pmx
+pbq: qph qxr ffn nqz
+mms: bst brz pjg
+qxj: tjs blx snb
+pzt: vml
+zzz: pkt dqs gfg
+dtm: mqv dtr rjt fct
+rxp: tgj
+lgg: vhn pjr
+jzk: rvb zdv qvt gkk
+xfj: cvj sgd nrk lcm
+vfq: vmt znq gnr
+sbp: hmr
+qzq: kgv npb
+flh: nrx crh ddj szk pdk
+cmv: vtv ntv gcn tvc
+tck: cnk kjv vcp gld xlt
+qfm: nqz dlz
+nxv: nbb
+kbq: jtx hgp
+mdr: fnz gqd vnn bst
+bpp: ppd lnh smm zxq
+mrq: jbh
+zdt: gqd
+pnq: dhj rqh
+dvx: qvp bhd
+sch: dtv dfk
+cst: ttd
+vbk: qkl psx
+tmz: qgg mzb jgs jsh
+ddj: tgv msp gqd
+zkg: mnd xbm kbg
+hmx: rln kbg sck lzs
+tqb: bjh xsp fxz tvt fpr
+bjm: xrr
+hjs: tmj dzc lpl ktz
+cdm: tgq hfg hxt xmh
+hhv: fxh hvs
+rrm: ldm
+xcs: dfj xhc
+khk: vgx rgt
+slf: ccj fbp sxt
+mcd: fmx jqq qhq
+pkl: fvp qhv ngp vcp jgq
+hzn: tpf mjs ghl
+gxs: hhj lfb
+tzn: prm
+tkc: tvj bjm
+hps: bbx
+hrs: qdl gsh lfn lhn
+ffn: rjh
+zhh: lvl hhc
+pch: pkj njr nzd lmv
+smk: pjs gdl
+ssc: rxp smk lhn
+tzd: xtm phn lpl qkg
+jmp: gqp lln
+xkp: jsm
+qch: lqp
+vjg: snr drk spc jcp tpf
+hvx: prm ztt qvp
+qdp: fsn fdl kdv vkv
+dkc: jkf rxg ncg dpn
+qhd: hgg phh gvg csr lmz
+nlz: czv cxj snv kxk tnx
+xbq: gzq fjj pmr tmj
+qnn: xxn qjk lqp mzp
+qqr: fkx mfl ghb
+mzk: xgm zjg tgb dvr gvr
+fbx: lmz fld nvb bcr rvn cgm
+tkf: czv btf
+mtc: bsf jnn rkn
+psz: htn bpn vnt
+msg: pjs
+rln: nhs lsm
+xcx: nhs xtp
+hgg: xmh hxt pjs
+lsh: jnq
+qgm: sdz
+ztf: ndx ncd lzq dsr xsl tnx mzb
+phn: gmz kvv dzz
+vnb: zfh
+xjv: tfg
+msc: pgh srf qmb
+tvd: crv cbn zcx
+gsd: crn phh jcp
+xvg: prm jjt
+cvf: qjc fkb ltk cgq
+ftb: msp gqq gqd vfq mlk
+rcr: cmd tzm mpx hhv
+vkp: pkr
+hgq: nlc ssk kdg
+tzm: hzf flq
+lxg: jbb vgp
+hhc: rgz
+zbd: csr rts lnz pkp
+rrt: pgz tjb jst prn
+gxx: dpm hkv xlr
+qmb: jcj bsx dxv gxv zbd
+brz: lgk kbr tck hjp
+ptt: hbb fdl qqd
+bdq: fjc
+cpp: btk xtp
+mdh: pkm qrs ppt
+fxz: kkk sns
+jqd: szr vlp bdv kgv
+lpr: njt mpx
+xbf: rhh dts cbl vnn
+dzn: hbh czs qns
+cpk: bmv scj xzj msj lzc
+jdv: jht
+zvv: zsg zmm bnc
+npz: nhv dqx vdz cpb cbl
+prc: jnq
+czd: kdx fjt qrv lnn
+cgn: fdc mpx kqq
+plm: hxs mhx vtt
+ldp: cqb pgg trg psx
+dsz: lqp djg fqq
+szh: pzx cfl cdk kzl vzn
+jjd: kzz
+tpz: phn bnr xlt
+bhd: vbh
+cbl: rzc
+jqj: nsh
+zmx: bnx ptg zhx xkp
+mml: vzx qvt
+cpb: qhb xlt
+jdj: gfg
+gbx: jvs lgk vdn
+jqz: gmv scd lnz jdk
+kdq: xjd gcg fjl kgx
+ghg: mxc
+pnt: zvx vbp
+plh: zgb crs
+fjp: cjc hpf snr xfj
+czs: vth
+prn: nsv mbh dtk kzz
+lxb: jbh vft nbb
+ftt: gfg vkv cbn vns
+shq: gbv qns flg
+phd: lpk tmv dlz
+zvq: nnk khk
+hnh: kdg
+llb: nxv qxq
+ncd: fkb
+tmv: xjd cmz
+dxj: tcc
+qfx: ltm pdk mxc
+mfb: fgd
+vjn: skn gmg
+htv: rnr fht jjq fth mng
+tqp: ktp scp vcj ngs
+jsz: hmr tqx
+mzv: sch msj
+jnr: drr vnm nkf zrj
+chg: ppd vcp dtr lsm jnq
+qkx: xxt tgv fnc ngs
+vtm: mvr bkg rdv
+bsn: mdd
+zmh: stl
+ljx: gtb vnh msp jbt
+rhl: ddb ghl bcq srt
+ljr: czp
+vnn: drr
+dmz: djg bjt nsz drk bsn
+cqk: rjh mch nlc drr hrn njj
+zld: tsm nfr
+gjk: lcs vgb
+vln: rbl mdh ndq
+ctk: cjc vpq hgv
+qlr: prs cjc hhc
+fpf: gvr vxh
+fkh: bjr bjc dsv
+mqk: bgl lgn kff
+xvp: vcn bjm stj
+xgm: zvs
+pgh: kkt
+pmp: ngh pkv bsc vsj
+snr: plj
+pqd: zfm phg lzb jfl
+bqt: nqf nfh xvg csj
+xjp: rfg mtv mfl
+gsh: rxp hzf jtq dtv pkr
+znh: zxq
+zvj: mpx ccn czv qgg
+lhg: fjt bnx mhh
+tjs: ngs
+knn: bbs
+lfb: bhf
+bcn: rrg ssn lzb
+njb: tml hmk qqk
+dbv: ttx vbn vng qgf
+rzf: ssn skh
+ddx: ppx hsm znh rdl
+qfz: kfj kdv
+xnk: gkg
+ftc: tkc jst
+vtj: thv jdj tdh
+dtk: ghl qnh
+sls: pzx scp
+vcp: knc
+fzz: zth
+xqk: qvt jtq
+tvt: llb krf mvv
+dvv: kpz fbj phd nng
+pzc: vfk fsr jsz tqb sbm mvv
+gpl: bkz pts mmk
+mzl: xng fxz qlk
+nbh: dmm qfz brs gld
+txd: vgb btk
+zgb: dfk
+hhs: xkf
+gck: bcn cqn tcc cgm
+fnj: qvt mcv ttd bfx zfh
+bjh: mzt jzq zhh
+ssn: vzx bbx
+lxk: xrd dxb
+rbl: tvc gdj
+mcv: mrq zdh pts nmt spc
+ztb: lhz nvb lnb jzq
+qgg: tzm hpf gfx
+mnc: hqd qnh rkp vnt
+kdx: bjp ltc
+mvf: zls cnp rfg rxr
+plf: dtv npb xng
+grd: zjm vcn jzq
+gms: smg lnz
+tlz: mdd gtt
+vpp: pst fvp hhr njj qxr
+slm: llj
+jxv: kpz rnr
+lvl: bbx
+rnx: dks
+qbh: vhc pxn hgv
+qnh: bzg
+rzz: vbh crn
+qmx: phr qqb njs pzt
+nhc: pxt vcs jtz
+ptn: mff vpq
+ppp: hhv msg srf fxm
+rsm: cls cxq sns bcr lmz
+xdx: xrd zhp kdx
+bnx: fqq mxk
+jzg: vqc dxj lxk
+zrn: bhf sfb zxq
+jbs: ksc thv lnh nbl rbj hfv nzn
+ndq: jqj
+gnr: rrm vns
+dfr: msj gtt bkb rbs xlv
+ptd: hbb
+rrq: fsr xrr xvp ntn
+mjs: cxg
+gfq: rmz gms lxb lzn czm
+hfn: nhs
+rcb: mcg lpr dlt mlh
+qlp: xtp cht mkk nfg
+kjg: mbk nrk qqj tmz ssq
+frx: pcg qrs bnc vmt
+kqs: ckz rtj
+vkc: mrd vfc qrk vmt
+jtq: sjb
+frz: psz ctf fml
+qhb: hpr
+ndr: bdv nqf jrl sld
+txh: xjp fqb zzx tft kvv
+xbz: jkj hxh
+ksc: czj hzs kmp
+cgl: kgx cbc
+gtk: dmb mlk
+dcx: lsm vdz rjt
+spg: jzc mkk frx
+pms: xrd gmg
+hdl: fpj
+bpj: kzz
+vpc: mqv ccj bdq
+znn: gpd nzd dtp
+pkp: zhn hdb krh
+ltp: msj lzc
+ckh: jsz rvb xgm jsm qch
+stj: vft rvn qns
+cbn: vnh zls
+mrg: tlz njr lhs nxv
+mgk: pnm kbm
+hmj: fnc qhq
+gbz: ffn rkv kzl pdj
+cls: bmt vkp
+fmp: drs jkf jmd sck jnn tkt znh
+gxv: jgs xqq nhl
+mgv: zhd
+xgf: rqh
+jjs: jnn mxc
+nmt: szr
+zpr: fkx lhm dcv
+cvq: qhb qfz qxz
+rbq: gjk xrb qrs hbc
+sqh: phn xhc hnk qng ktz
+ntz: kbm pll
+rhh: qmm
+hxl: dtv gsh
+mhq: jbh
+dff: cnl kfn kdv
+vjd: dgm jcj fpr
+nnt: vng nvt qlr lms bmv
+grj: gld mgk zzx fjj
+xsp: hzf
+snp: stm ghg xtm
+rss: rjt mgk fdv
+qgx: fnc bxm
+fqp: hxl
+spc: gpd
+cnm: tcc
+kpf: vzj hps lfn
+ljv: cjc
+hnk: fts gqq pkt
+dgc: mmk rrg vqc
+brg: fxg gcg
+rjq: mbt fqp csj
+jkt: gxx jbt plm
+htn: vxh gcc hdb
+nrk: jrt
+zvs: zdh klk
+xdk: rzc fsq ctc btx vxb
+tlc: gsk cgg mjs
+lkx: xzj rts rsb
+rpb: jzj pkm llj
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+sck: xrb
+zxq: dzc
+vds: slm zdt cxh gjg mlk
+rxn: sgd xxn
+mbn: hvs hng ptn prs
+zvf: fjt fvj nzz kxk
+bjt: fgf xrr
+ggb: hgv cgg mzp
+hhr: ldt
+gll: rrg dvr
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+dct: gjl xxt gbx tzd
+mch: fnc tjs dks ndq qmn
+svb: trq tbs gpj ctk
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+dpf: lmv gms msj gcc qns
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+szn: gmd pgg
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+rbs: nbb qtr
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+xmb: sbp jsh pmx bkb
+ctc: vtd dks
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+lnn: csj
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+hgv: zvx
+qlt: npm gbx bhf vhh
+jjq: qrc rkk hkv
+hpr: tkt
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+jvd: nxj njt sqp
+fks: jvl cls mjk skd
+scn: skh pcv
+jzc: rnx
+dkl: nzn
+grf: szr lpr fzj
+frl: bhd
+bbk: xjd kbt
+tgj: plj
+fsm: tzs gkc dft xgn
+vcj: mcs dxc ppx qqb
+ntv: klq hzs
+fld: dvx bzs
+mzq: xrd
+qjk: fzh
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+xkf: gdj ntz dtr mng
+kxh: qxj ptd vfq
+kjh: ttt vnb cst pnt
+plq: ssq dzn jsm
+mbj: sls kbg slv vrv
+hrt: lkb prm jff
+fsq: dcr
+nzn: nrf
+qdv: mtk smb tlc dgr lxk
+skh: kkt
+dbf: mzp ptn vjn
+nhj: jfn bdd rnr bxv
+gcx: fkr ssc kqs cgn
+cmz: vqm
+jrl: cnm dfk cbz
+bdm: lnn xng kbq bdj
+dts: rgc dpm njj zld
+nmm: llj qqd
+fkx: jnc rkz
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+crv: fmx szh
+kqk: frl qnh bnj
+thd: jqs scd dxj
+gzq: srl
+mzb: gft fjt
+vnm: tmj