commit - 9320fac455489ef7263b15f3a6336c7ed34a7934
commit + 9c7d442a8c160ee59e815001d865082616b8bfdc
blob - /dev/null
blob + 31eda297d2fa5e9b40c810d12eb9c1a37937140f (mode 644)
--- /dev/null
+++ input/12.txt
@@ -0,0 +1,140 @@
+CCCCCCCCCBBBMMGGGGGGGGGGGGGYWWWWWWWWWWWWOOOOOOOOOOOOOOOOHLLHHHHHHHHHHTHUUUULBBBBBBBBBBBBPPPPPPPPPPPKKWWWWCCCWWWWWWWWWWWWWWWWWWWWEEEEYNNNYYLL
+CCCCCCCCCBBBBBBGGGGGGGGGGGGGWWWWWWWWWWWWOOOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHUUULBBBBBBBBBBBPPPPPPPPPPPPPPPWWWCCCWWWWWWWWWWWWWWWWWWWBEEEYYYNYYLLL
+CCCCCCCBBBBBBBBGGGGGGGGGGGGWWWWWWWWWWWWWOAOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHUUULLLLLBBBBBBBBPSPPPPPPPPPPPMMWWCCCCCCCWWWWWWWWWWWBWWWBBBBYYYYYYYLL
+CCCCCCCCBBBBBBBGGGGGGGGAAGWWWWWWWWWWWWWWWWOOOOOOOOOOOIOOHHHHHHHHHHHHHHHHUUULLLLLLLBBBJBJSSPPPPPPPPPPMMMMMCCCCCCCWWWWWWWWWBBBBBWBBBBYYYYYYYYY
+CCCCCCCCCBBBBBBGGGGGGGGGAAWPPWWWWWWWWWWWWWOOOOOOOOOIIIOHHHHHHHHHHHHHHHHUULLLLLLLLBBBBJJJSSPPPPPGGGGPEEMCCCCCCCCCCCCCCCBBWWBBBBBBBBBBYYYYYYYY
+CCCCCCCCCBBBBBBBGGGGGGGGAAASSWWWWWWWWWWWWWOOOUOOOIIIIIIIYHHHHHHHHHHHHHHHHHNLLLLLLLBBBBJJJJVPPPPGGGGPEEMCCCCCCCCCCCCCCCBBBBBBBBBBBBBYYYYYYYYY
+CCCNNNCCBBBBBBBBGEGGGGGAAAAASWWWWWWWWWWWWWXOOOOIIIIIIIYYYHHHHHHHHHHHHHHHGGLLLLLLLLLBBJJJJJJPPPPGGGGPMEMCCCCCCCCCCCCCCCBBBBBBBBBBBBBYYYYYYYYY
+CCNNNNNBBBBBBBBBBEBSGGGGGGSSSWWWWWWWWUWXXXXXXOOIVVVIIIIIYHHHYYHHHYYYYHHHGLLLLLLLLLLLLJJJJJPPPPPGGGGPMMMMMMMCCCCCCCCCCBBBBBBBBBBBBYYYYYYYYYYM
+NNNNNNNVVVBBBBBBBBBSGGSSSSSSSSWWWWWWWUWWXXXXXXOVVVIIIIIIYYYYYYYYHYYYYYHHGGLLLLLLLLLLLJJJJJJJPPPGGGGPMMMMMMMCCCCCCCCCCBBBBBBBBBBBBBBYYYYYYMMM
+NNNNNNNVVVBBBBBBBBBSGGSSSSSSSDDWWWWWWWWXXXXXXXOOIIIIISIIYYYYYYYYYYYYDYYGGGLLLLLLLLLLLJJJJJJJPGGGGGGPPPMMMMMCCCCCCCCCCBBBBBBBBBBBBBBYYYYYYMMM
+NNNNFNNNNBNBBBBBBBSSSSSSSSSSSSSSWDWWUUNXXXXXXXXXIIIIISSSSYYYYYYYYYYYYYYGGGLLLLLLLLJJJJJJJJJJGGGGGGGPDMMMMMMCCCCCXWWWWWBBBBBBBBBBBBBYYYYYMMMM
+NNNNNNNNBBBBBBBBBBSSSSSSSSSSSSSSSDDDNUNNNXXXXXXXIIXIISSSYYYYYYYYYYYYYYYGGGGGLLLLLLLJJJJJJJJJGGGGGGGPDDMDMMMXXXXXXXXXWWWWWWBBBBBBBBBYYYYMMMMM
+NNNNNNNBBBBBBBBBBBSSSSSSSSSSSSSSSSNNNNNNNNXXXXXXXXXXXXSSSQQNYYYYYYYYYYGGGGGGLLLLLLLLJJJJJJJDGGGGGGGDDDDDMMDXXXXXXWWWWWWWWBBBBBBBBBHYYYMMMMMM
+NNNNNNAAXXXBBBBXXBBBSSSSSSSSSSSSSENNNNNNNNNNXXXXXXXQXXQQQQQNYYYYYYYYYYYGGGGGGLLLLLLLJJJJJJJDGGGGGGGDDDDDDDDXXXXXWWWWWWWWWWWBBBBBBHHYYYMMMMMM
+NNNNNNNNXXXXXXXXBBBSSSYSSSSSSSSSSNNNNNNNNNNZXXXXXXEQQQQQQQQYYYYYYYYYYYYGGGGGLLLLLLLGJJJJJJJJGGGGGGGDDDDDDXXXXXXXXWWWWWWWWWWBBBBBBHHHYYMMMMMM
+NNNXXNNNXXXXXXXXXXXYYYYYSSSSSSSSIIINNNNNNNNXXCXXXXEQQQQQQQQQYYYYYYYYYYYGGGGGGGGLGLGGJJJJJJJDGGGGGGGDGDDDGGXXXXXXCWWWWWWWWWWWWABOOHHHYMMMMMMM
+SNNSXNNNRXXXXXXXXXXXYYYYYSSSSSSIIIINNNNNNNNXXCCXEEEQQQQQQQQYYYYYYYYYYYYGGGGGGGGGGGGJJJJJJJJUGGGGGGGGGGGGGGGGGGXCCCWCCWWWWWAAAAAOOHHHHMMMMMMM
+SSSSXSNNRXXXXXXXYYYYYEYNYSSSMHSIIIIINNNNNNNNCCCCTTEQYYQQQQQQYYYYYUYYYYYGGGGGGGGGGGJJJJJJJJJJGGGGGGGGGGGGGGGGGGXGCCCCCWWWWWAAAAAHOHHHHMMMMMMM
+SSSSSSNNSJJJXXXYYYYYYYYYMSMMMMGMIMIINNNNNNNCCCCCTTEYYYQYQQQQQQMYUUYUYYGGGGGGGGIIIJJJJJJJJJJUGGGGGGGGGGGGGGGGGGDGCCCCWWWWWWAAAAAHHHHNMMMMMMMM
+SSSSSSSSSSSJXXXYYYYYYYYYMSMMMMMMMMIIINNNNNNCCCCCTTEYYYYYYQQQQBBBUUYYYYYOOOOGGGIIIPJJJJJJJJUUGGGGGGUGGGGGGGGGGGGGCCCCCCAAAAAAAAAHHHHNMMMMMMMM
+SSSSSSSSSSSJJJJYYYYYYYYYYMMMMMMMMMIIIINNNCCCCCCTTTTCYYYYQQQBBBBBBUUYYYYOGOOOOGIIIIIIIJJJJUUUGGGGGGGGGGGGGGGGGGGGCCCHHHAAAAAAAAAHHHHNNMMMMMMM
+SSSSSSSSSSSSSJJJYYYYYYYMMMMMMMMMMMIIIINNNCSCCTTTTTYYYYYYPPQBBBBBBUUUYGYGGOGGGGIIIIIIIJJIIUUUGGGGGGGGGGGGGGGGGGCGGCCCCCAAAAAAAAAHHHNNAAAMMQMM
+SSSSSSSSSSSJJJJJYYYYYYYYMMMMMMMMMIIISISSSSSCCTTTTTYYYYYYPPPPBBBBUUUUUGGGGGGGGGIIIIIIIIJIIUUUGGGGGGGGGGGGGGGGGGCCGCCCCCAAAAAAAAAKKKAKAHAMMQMY
+SSSSSSSSSSSSJJDJJJYYYYYMMMMMMMMMMOOSSSSSSSSSCTETTTTYYYPYPPPPPPBBBBUGUGGGGGGGYYIIIIIIIIIIIUUUGGGGGGGGGMMMGGGGGGCCCCCCCAAAAAAAAAAKKKKKHHAAMQMY
+SSSSSSSSSSSSJJDJJJYYOOMMMMMMMMMOQOFFFFSSSSSCCCCOOYYYYYPSPPPPBPBBBBGGGGGGGYGGYYIIIIIIIIIIUUUUUUUUUUUUUUMMGGGGGCCCCCCCBAAAAAAAAAAAAKKKHHHHHHYY
+SWSSSSSSSSSSJJDJDDYYMOOMMMMMOMOOOOOOSSSSSSSSCCYYYYYYYYPPPPPBBBBBBBIIIIGGGYYYYYYIIIIIIIIIIIIUUUUUUUUUUMMMMMMGKCCKKCCCCAAAAAAAAAAAAKKKHHHHHHYY
+SSSSSSSSSSSSJDDDDDDYMMMMMMMMOOOOMOOOOOSSSSSNCCZZZZYYYYPPPPPBBBBBBBBBBBWYGAAAAAAAIIIIIIIIIIUUUUUUUUUUUMMMMMKKKKCKKCCCBAAAAAAAAAAAAKKHHHHHHYYY
+SSSSSSSJSSSSJDDDDDDMMMMMMMMMMGGOOLOCSSSSSSSSCCZZZZZYYYEEPPPBBBBBBBBBBBBYWAAAAAAAIIIIIIIIIIUUUUUUUUUUUMMMMKKKKKKKCCBBBAAAAAAAAAAAAKHHHHHHPHHY
+SSSSSSSSSYYSDDDDDDDDDDMMMMMMMMMMLLSCCSSSSSSZZZZZZZZZYSPPPPPPBBBBBBBBBBBYYAAAAAAAIIIIIIIIIIUUUUUUUUUUUUUKKKKKKKKKKCCBBAAAAAAAAAAAAHHHHHHHHHHY
+YYSYSSYYYYYDJDDDDDDDDDMMMMMMMMLLLLSSSSSSSSSZZZZZZZZVSSPPPMPBBBBBBBBBBBBYYAAAAAAAIIIIIIIIIIUUUUUUUUUUUKKKKKKKKKKKKBBBBAAAAAAAAAAAAHHHHHHHHHHH
+YYYYSSYYYYYDDDDDDDDDDMMMMMMMMLLLLLSSSSSSSSSSZZZZZVVVSSPPPPBBBBBBBBBBBBYYYAAAAAAABIIIIJJIIIUUUUUURVKKKKKKKKKKKKKKKBBBBAAAAAAAAAAAAHHHHHHHHHHF
+YYYYYYYYYYYDDDDDDDDDMMLMMMMLLLGGLLLLSSSSSSSSZZZZZVVVVSVBPBBBBBBBBAAAAAAAAAAAAAAABIIIIJJJIRRRRRRRRRRRKKKKKKKKKKEKKBBBBAAAAAAAAAAAAHHHHHHHHHHF
+YYSSSYYYYYYDDDDDDDDDDMLLLLLLLLGGGGLLSSLLSSSZZZZZZVVVVVVBBBBBBAAAAAAAAAAAAAAAAAAABBIIRRRRRRRRRLRRRRRRKKKKKKKKKKKKWWWBBAAAAAAAAAAAAHHHHHHHHFFF
+SSSSSSYAAYYYYDDDDDDDDDDLLLLLGGGGGGGLLLLLLSSZZZZZZVVVVVBBBBBBBAAAAAAAAAAAAAABBYYBBRIIRRRRRRRRRRRRRRRKKKKKKKKKKKKKWWWWWAAAABBBBBBBCHHHHHHAAFFF
+SSSSSAAAAYAYYYYDDDDDDDDDDZZZGGGGGGGGGGLLLSSZZZZZZVVVFVBBBBBBBAAAAAAAAAAAAAABBBBBBRRRRRRRRRRRRRRRRRRKKKKKKKKKKKKKWWWWAAAAABAABIBHHHHHHHHAAAFF
+SSSSSAAAAAAAYYYYDDDDDDDDZZZZGGGGGGGGGGGLLSZZZZZZVVVVVBBBBBBBBAAAAAAAAAAAAAABBBBBBBNRRRRRRRRRRRVRRRRRKKKKKKKKKKKWWWWWAAAAAAABBIIIHHHHHAAAAAAA
+SSSAAAAAAAAAAAAZDDDDDDDDZZZZGGGGGGGGGGGLLZZZZZZZZVVVVVBBBBBBBAAAAAAAAAAAAAABBBBBBBBRRRRRRRRRRRVRRRRRRKKRKKKRKKWWWWWWWAAAAAAAIIIIHHHHHMAAAAAA
+SSSAAAAAAAAAAADZKKKDDDDZZZZZGGGGGGGGGGGGLZYKKZKUVVVVVVBBBBBBBAAAAAAAAAAAAAABBBBBBRRRRRRRRRRRRVVVRRRRRRRRRRRRRWWWWWWWAAAAAAAAAIIIIISSAAAAAAAA
+SSSAAAAAAAAAAKKKKKKKDDZZZZZZZGGGGGGGGGGGGGKKKKKUUVVOODOOBBBBBBBBBJJJJJJBBBBBBBBBBBRRRRRRRRRRRVVVRRRRRRRRRRRRWWWWWWWAAAAAAAAAAIIIISSSSAAAAAAA
+SSSAAAAAAAAAAKKKKKKKZZZZZZZZZVGGGGGGGGGGXKKKKKKUVVOOOOOOBBBBBBBJJJJJJJJJJBBBBBBBBBCCRRRRRRRRRVVRRRRRRRRRRRRRWWWWWWWAAAAAAAAAAIIIIIIAAAAAAAAA
+SSSAAAAAHHHHHHHHHHHHHHHHHHZZZVGGGGGGGGGKKKKKKKKUVVOOOOOOCBBBBBBBJJJJJJJJJBBBBBBBBCCRRRRRRRRIRRRRRRRRRRRRRRWWWWWWWWWAAAAAAAAAAIIIIIIAAAAAAAAA
+SSSSAAAAHHHHHHHHHHHHHHHHHHZZZZQQGQQGGGQKKKKKKKKVVVOOOOOOCCBBBBBBJJJJJJJJJJJJJJBCCCCRRRCCCCCIIIRRRRRRRRRRRRWWWWWWWWAAAAAAAAVVIIIIIIIOAAAAAAAA
+SSSSSSAAHHHHHHHHHHHHHHHHHHZZZZZQQQQQQQQQQKKKKKKKOOOOOOOOCCBBBBBJJJJJJJJJJJJJJJBCCCCCCCCCCCIIKKKRRRYRRRRWWWWWWKWWWKKAAAAAAAAIIIIIIIIIHAAAAAAA
+SSSSSSSAABBBBKKKHHHHHHHHHHZZZZZQQQQQQQQQQQKKKKKKOOOOOOOOCCCBBBBJJJJJJJJJJJJJJCBCCCCCCCCCCCCCKKKKKRKRRRRWWWWWWKKKKKKWAAAAAAAIIIIIIIIIHAAAAAAA
+SSSSSSSSABBBBBZZHHHHHHHHHHZCCEECCCCQQQQQQQKKKKKKOOOOOOOOOCBBBBBJJJJJJJJJJJJSCCCCCCCCCCCCCCCCKKKKKKKKKKKKWWWGGKKKKKKWWWAATTIIIIIIIYHHHHAAAAAA
+SSSSSSSSSSSBBBBHHHHHHHHHHHZZCCCCCCCQQCQQQQNKKNOOOOOOOOOOOBBBBBBBBJJJJJJJJJJSSCCCCCCCCCCCCCCCCKKKKKKKKKKMMMGGYYKKKKKWWWWATTIIIINIIYYHYYAAAAAA
+SSSSSSSSSSSSBBBHHHHHHHHHHHKKKCCCCCCCCCQQQNNKKNNOOOOOOOOFFBBBBBBBBJJJJJJJJJJJCCCCCCCCCCCCCKCCKKKKKKKKMMMMMMMGGKKKKKKWWWWTTTTITIIIKYYYYYAAAAJA
+SSSSSSSSSSSSSSBHHHHHHHHHHHHHKCCCCCCCCCNNNNNNNNNNOOOOOOOFFFFBUBHHHHHJJJJAJQQJQCCCDCCCJCKKCKKKKKKKKKKMMMMMMMGGGKKKKKKTTTTTTTTTTTTIKYYYYYAYAAAU
+SSSSSSSSSFFFFBBHHHHHHHHHHHHHHCCCCCCCYCYNNNNNNNNNNNNOOOORRRRRRTZHZZZJJJJJJQQQQCBCCCCCCCKKKKKKKKKKKKKKMMMMKMGGGKKKKKKTTTTTTTTTTTTTTTYYYYYYYAAU
+SSSSSSSSFFFFFBBHHHHHHHHHHHHHHCCCCCYCYYYYYNNNNNNNNNNOONARRRRRZZZZZZZJJJJQQQQQQQCCCCCCCDKKKKKKKMMKKKKKKMMMKMGGGKKKKKKTTTTTTTTTTTTTXTYYYYYYYYYY
+SMSSSSSSJFFFFFBHHHHHHHHHHHHHHHCCCCYYYYYYYYYNNNNNNNNNNNRRRZZZZZZZZZZZZJJQQQQQQQQQCCCCDDKBKKBKMMMKKKKKKMMKKKJGGGGGKKKTTTTTTTTTTTTTTTTTTYYYYYYY
+YJJSSSSJJFGFFFBHHHHHHHHHHHHHHHCCCYYYYYYYYYNNJNNNNNNNNNVRRRRZZZZZZZZZZQQQQQQQQQQQCCCCCGBBBBBBBMAMKKKKKKKKKCGGGGGKKKKTTTTTTTTTTTTTTTTYYYYYYYYW
+YGJJSSSJJJFFJJJHHHHHHHHHHHDLHHHCYYYYYYYYYYYYNNNNNNNNNVVVVRRRZZZZZZZZZQQQQQQQQQQQQQCCCGBBBBGBBMMMKKKKKKKKKCCGGGGKKKKKTTTTTTTTTTTTTTTTYYYYYYYY
+YGJSSJJJJJJJJJJHHHHHHHHHHHLLLLLLYYYYYYYYYYYYNNNNNNNNNNVVVRRRRRZZZZZZZQQQQQRQQQQQQQQCGGGGGBGMMMMMMMKKCKKCCCCCZGGKKKKKTTTTTTTTTTTXTTTTYMMYYYYY
+GGJJJJJJJJJJJJJJJHHHHHHHLLLLLLLLLYYYYYYYYYYYYNNNNNNNNNVVVRRRRRZZZZZZRQQRRQRRQKKQQQQCQGGGGGGMMMMMMKKCCCKCCCCCCGKKKKKKTTTXXXXXTTTXTTMTMMMMMYYY
+GGGGJJJJJJJJJJJJJHHHFHHLLLLLLLLLLYYYYYYYYYYYYNNNNNNNNNNVRRRRRZZZZZZZRRRRRRRRRKKKQQQQQQGGGGGGMMMCMCCCCCCCCCCCCCKKKKKKTTTXXXXXXXXXXXMMMMMMAYYY
+GGGGGJJJJJJJJJJJJHHHHHHLLLLLLLLLLYYYYYYWYYWYYYNNNNNNNNSSSRRRRAAZZZZRRRRRRRRRRKEKKQQQQGGGGGGOOOMCCCCCCCCCCCCCCNNNNNNNNNNNNNNNNNNMMMMMMMMMMYYA
+GGGGGJJGTTTTJJJJJLLLLLLLLLLLLLLLLLLYWYWWWWWYYNNNNNNNNNSSSSRKAAAZZZRRRRRRRRRKKKKKKQQQQQGFGGGOOOICCCCCCCCCCCCCCNNNNNNNNNNNNNNNNNNXMMMMMMMMMMYA
+GGGPPGJGTTTTJTJJJLLLLLLLLLLLLLLLLLYYWWWWWWWWYYYNSNNNNSSSSABAAAAZZRRRRRRRRRRKKKKKNNNNQQFFFFGOOOCCCCCCCCCCCCCCCNNNNNNNNNNNNNNNNNNMMMMMMMMMMMAA
+GGGGGGGGTTTTTTTLLLLHLLLLLLLLLLDLLLLWWWWWWWWWYYYSSNNSSSSSSAAAAAAAAARRRRRRRRRRKKKKKNNNNQQFFOOOOOOCCCCCCCCCCCCJGNNNNNNNNNNNNNNNNNNMMMMMMMMMMMAN
+GGGGGGGGGTTTTTTTTTTHLSLLLLLLLLDLLLXXWWWWWWWWYYYSNNNSSSSSSAAAAAAALLRRRRRRRRRRRKKRNNNNQQRFFOOOOOOCCCCCCCCCCCCJJNNNNNNNNNNNNNNNNNNMMMMMMMMMNDNN
+GGGGGWGGGTTTTTTTFFSSSSSSLLLLLLLLLBWWWWWWWWWWYYYSSSSSSSSSSAAAAAAAAARRRRRRRRRRRRRRNNSSRRRRRRROOOOOOCCCCCCCCJJJJNNNNNNNNNNNNNNNNNNXXXMMMNNNNNNN
+GGGGWWWGGTTTTTTFFSSSSSSSLLLLLLLLKBWWWWWWWWWWYYYYSSSSSSSSBJJAAAAAAARRRRRRRRRRRRNNNNNNOORRRRRROOOOOCCCCCCCJJJJJNNNNNNNNNNQQQQXXXXXXXXXXNNLNNNN
+GGGWWWWTTTTTTTTTTOSSSSSSBLSSHLLLKKJWWWWWWWWWWYYRRSRSRSBBBJJJAAAAAAARRRRRRRRRRRNNNNNNOOOORRRRRRROOOOOOJJJVJJJJJJJNNNQQQQQQQQQXXXXXXXXXNNNNNNQ
+GGGWWWTTTTTTTTKSSSSSSSSSSSSSHLLLKKKWMWWWWWWWWWYRRRRRRBBBBBAAAAEEEAARRRRRRRRRRNNNOOOOOOORRRRRRROOOOOGJJJJJJJJJJJJNNNQQQQQQQQQXXXXXXXNNNNNNNNN
+WWWWWWTTTTTTTTTJSSSSSSSSSSSSSKKKKKKWMWWWWWWWWWYRRRRRBBBBBBAAAAEEEEEEERRRRRRRRRRROOOOORRRRRRRRRROOOGGJHJJJJJJJJJJNNNQQQQQQQQQXXXXXXXNXNNNNNNN
+WWWWWTTTTTTTTTTTSSSSSSSSSSHKKKKKKKUKMWWWWWWWWKKKKRRBBBBBEEEEEEEEEEEEETRRDDRRRRROOOOOORRRRRRRRRROOGGGGJJJJJJJJJJJJJQQQQQQQQQQQQQQXXXXXNNNNNNN
+WWWWWWWTTTTTTTTSSSSSSSSSSSKKKKKKKKKKKWWWWWWWKKKKKRRBBBBBBBBEEEEEEEEETTRRDDRRRRRROOOLOORRRRRRROOOGGGGGJJJJJJJJJJJJCQQQQQQQQQQQQQXXXXNNNNNNNNN
+WWWIWWWTTTTTTTSSSSSSSSSSSSKKKKKKKKKYYWWWWWWWWKKKKLRBEBEEEEEEEEEEEEETFTTTDDDTTTRBLLLLLLRRRRRRROOHGGGGGGJJJJJJJJJJJJWQQQQQQQQQQQQQXXXNNNRNNNNN
+WWIIIWWWTTLTTTSSSSSSSSSSKKKKKKKKKPPYYWWWWWWWWKKKKLLEEEEEEEEVVVVVEEETTTTDDTTTTTTLLLLLLLLRRRRRRHHHGGGGMJJJJJJJJJJJQQQQQQQQQQQQQQQQQQNNNRRNNNNN
+WWIIWWWTTKGTTTSSSSSSSSSKKKKKKKKKPPPPMMMMWWWKKKKLLLLEEEEEEVVVVVVEEEETTTTTTTTTTTTLLLLLLLLRRRIRHHHHGGGGGJJJJJJJJJJQQQQQQQQQQQQQQQQQQQQRRRDDDNNN
+IIIIIWWWWGGGVVSSSSSSSSSSKKKKKKKKPPPPMMMMWWKKKKKKLLLLELEEEVVVVVVEEEEEETTTTTTTXLLLLLLLLLLLLLLHHHHHGGGGGGJJJJJJJJQQQQQLLLQQQQQQQQQQQQQQRRDDMMDD
+IIIIIIWWGGGGGVVVSSSSSSSSKKKKKKKFEPPMMMMMMMKKKKKLLLLLLLEVVVVVVVVEEEEETTTTTTTTLLLLLLLLLLLLLLLHHHHHHHGGGGJJJJJJJJNQQQQQLLQQLLQQQQQQQQQQDDDDDDDD
+IIIIIIGGGGGGGGGVSSSSSSSSSSKKKKKFFPPMMMMMMMKKKSSLLLLLLVVVVVVVVVEEEETETTTTTTTTTLLLLLLLLLLLLLLHHHHHHHGGGGGAJJJJJDQQQQQLLLQLLLLQQQQQQQQQDDDDDDDD
+IIIIIGGGGGGGGZZZGSSSSSSSSSKKKFFFFHPMMMMMMMKSSSSLLLLLLVVTVVVVVVEEEETTTTTTTTTLLLFFFFFFFFFFLLHHHHHHHHGEEGDDDJDDDDQQQQQLLLQQLQQQQQQQQQQQDDDDDDDD
+IIIIIGGGGGGGGZZZTTSSSSSSSSKKKKFFFFPMMMMMMMKKSSSLLLLLLLVVVVVVVEEEEEETTTTTTTTLLLFFFFFFFFFFHHHHHHHHHHGEDDDDDDDDDDQQIQQQQLLLLQQQQQQQQDQQDDDDDDDD
+IIIIIICGGGGGGZZZTTNSSSKKKKKKKFFFFFFMMMMMMMKSSSSSLZLLLLVVVVVVVEEEEEETTTTTTTTLLLFFFFFFFFFFHHHHHIIIHHEEDDDDDDDDDDDTDDQLLLLLTTQQQQQQDDDQDDDDDDDD
+IIIIIIGGGGGGGZZZNNNNKKKKKKKKKKFFFFFMMMMMMMKSSSSSFZLLLLLVVVVPVLLEETTTTTTTTTTQLLFFFFFFFFFFHHHIIIHHHHEEDDDDDDDDDDDDDDLLLLLTTTTTQQQQQDDDDDDDDDDD
+ZZIIIIUGWGGGGZZZNNNNNKKKKKKKKKFFFFBKKKKKKKKSKSSSFZLLLLLLVZVPPLLLETTTTTTTTTTTOOLLLLLLLILIHIIITTTHHHEEDDDDDDDDDDDDDLLLLLLLTTTTTTDQDDDDDDDDDDDX
+ZZIIIUUGWWZZZZZZNNNNNKKKKKKFFFFFFFFKKKKKKKKKKKKZZZZLLLLLVVLLLLLLEETTTTTTTTTOOONNNNNLIIIIIIIIIIIHHEEEEEDDDKKDDDDDDDLLLIIIIIIIIIIQDDDDDDDDDDDD
+ZIIIIUZGGGZZZZZZNNNNKKLKLFFFFFFFFFFKKKKKKKKKKKKKZZZLLLLLLLLLLLLLEETTTSTTTTSSFNNNNNNNIIIIIIIIIIIHEEEEEEEDDKKDDDDDDLLLLIIIIIIIIIIDDDDDHHHHHHNN
+ZIIIZZZZZNZZZZZZNNNNNNLLLLFFFFFFFFFKKKKKKKKKKKKKZZLLLLLLLLLLLLLEEEEETSSTTSSLFNNNNNNNIIIIIIIIIIIHHEEEEEEKKKKDDDDDDLLLLIIIIIIIIIIDDDDDHHHHHHNN
+ZZIZZZZZZNZZZZZZNNNNNNLLLLFFFFFFFFFKKKKKKKKKKHKKGGSLLSLLLLLLLLLLEEESSSSSSSLLFFNNNNNNNPIIIIIIIIIIIEEEEEEEKKLLDLLLDLLLLIIIIIIIIIIDDDDDHHHHHHHN
+ZZZZZZZZNNZZZZZZNNNNNLLLLLLFDFFFFQQKKKKUKKKKKKKKSGSLLSLSSSSLLLLEEEESSSSSLSLLFFFNNNNKQQQIIIIIIIIJIEEEEELLLLLLLLLLLLLKKIIIIIIIIIIDDDDDHHHHHHHH
+ZZZZZZZZZZZZZZZNNNNNNNLLLLLQQQQQQQGKAKKEKKKKEEESSGSSSSSSSSSTLLLJJJESSSSLLLLLLQQQQNNNQQQIIIIIIIIIIEEEEELLLLLLLLLLKKKKKIIIIIIIIIIDDDHHHHHHHHHH
+ZZZZCZZZNNZZZZZNNNNNNNLLLLLQQQQQQQQKAAKEEEEEEEESSSSSSSSSSGZTTTLJJJJSSSSSLLLLLQQQQQNNQQQIIIIIIIIIEEEEEELYLLLLLLLLKKKKIIIIIIIIIIIDHHHHHHHHHHHH
+CCCCCCZZNNZZZZZNNNNNUNNLLLLQOQQQQQQQQAKEEEEEEEEESSSSSSSSEZZTTTJJJJJFSJNNLLLLLQQQQQQQQQQIIIIIIIEEEEEEEELYYLLFFLLLLPPKIIIIIIIIIIIHHHHHHHHHHHHH
+CCCCCCZZNNNNNNNNNNNNLLLLLLLOOOOQQQQQQQKEEEEEEEEESSSSSSSSEZZTTTJJJJJJJJLLLLLLLQQQQQQQQQQIIIIIIIEEEEEEEEYYYLYLLLLLLLLKIIIIIIIIKKHHHHHHHHHHHHHH
+LCCCZZZZZZNNNNNNNNNNNLJRRLLLOOOOOQQQQTTEETEEEEEEESSSSSSEEEZZTTJJJJJJJJJJLLLQQQQQQQQQQQQQIIIHIEEEEEEEEEEEYYYYLLLLLKMKIIIIIIIIKKHHHHHHHHHHHHHH
+LCLLLZLZLNNNNNNNNNRNNRRROOLOOOOOOQQQQTEEETTTTTEEEESSSEEEEZZTTTTJJJJJJJJJLLLLQQQQQQQQQQQQIIIHHHEEEEEEEYYYYYYYYLLZLKKKIIIIIIIISSHHHHHHHHHHHHHH
+LLLLLLLZLNNNNNNNRRRFRRRROOLOOOOQQQQQQTTTTTTTTTEEEEEEEEEEEZZTTTZZJJJJJJJJLLQQQQQQQQQQQQQQQQIHHHHEEYYYYYYYYYJJJJJJJKKKIIIIIIIISSSSHHHHHHHHHHHH
+LLLLLLLLLNLLLLLLRRFFRRRROOLOOOOQQQQDQRTTTTTTTTEEEEEEEZZZZZZTZZZJJJJJJJJLLLQQQQQQQQQQQQQQQQHHHHHNNYYNNNNNNNCJJJJJFKKKIIIIIIIISSSGHHHHHHHHHHHH
+LLLLLLLLNNLLLLLRRFFFFFRRROOOOOOYFQQQQTTTTTTTTEEEEEEEZZZZZZZZZZZZZJJJJJLLKLQQQQQQQMQQQQQQQNHHHHNNNYYYNNNNNNCJJJJJFKKKIIIIIIIISSSGGHHHHHHHHHHM
+LLLLLLLLLLLLLLLFFFFFFFFFFFOOOOOYYAAAATTTTTTTTTEEEEZZOZZZZZZZZZZUZJJJJLLLQQQQQQQQMMQQQNNNNNNNNNNNNYNNNNNNNNCCOCCCFFKKIIIIIIIISSSSSSSSSPXXHMHH
+LLLLLLLLLLLLLLLFFFFFFFOFOOOOOOYYYYYAAATTQTTTQTTQEEZZZZZZZZZZZZZZZJJJJJICCCCCCQQQOMQQQDDNNNNNNNNNNNNNNANNNNCCCCCCFFFFKKKKKKSSSSSSSSSSSPGGHHXX
+LLLLLLLLLLLLLLLFFFFFFFOOOOOOOOOYYYYAAATTQQTTQQQQEEEEEZZZZZZZZZZZZJJJJJJCCCCCCYQQOMDDDDDNNNNNNNNNNNNNNNNNNCCCCCCFFFFFKKKKKKSSSSSSSSRSPPGGXXXX
+SSSLLLLLLLLLLLLFFFFFFFFYOOYYYYYYYYYYAATTQQQQQQQQEEEEEZZZZZZZZZZZZJJJJJCCCCCCCCCCODDBDDDDDNNNNNNNNNNNNNNNNCCCCCCCFFFFFFKKKKKSSSSSSSPPPPGGGNNX
+SSLLLLLLLLLLXXLFXFFFXXXYYYYYYYYYYYYAAAQQQQQQQOQQQEEEEZZZZZZZZZZZYJJYGGCCCCCCCCCCOODDVDDDDINNNNNNNNNNNNNNCCCCZQFFFFFSSFFFFKSSSSSSSSAPPPPGPNNN
+LLLLLLLLLLLLXXLXXXXXXXXYYYYYYYYYYYYYYQQQQQQQQQQQQQEEEEZZZZZZZZBYYYYYGGCCCCCCCCCDDDDDDDDDDNNNNNNNNNNNNNNNNCCCZQFFFFFSSFFFFKSSSSSSSSSPPPPPPNNN
+LLLLLLLLLLLLLXXXXXXXXXXYYYYYYYYYYYYQQQQQQQQQQQQPQQEEEEEFZZLZZZBYYYYYYGCCCCCCCCDDDDDDDDDDDNDNNNNNNNNNNNNNNNCCZQFFFFFSSFFFFSSSSSSSSSSSPPNNPPNN
+QQQYLYYYYLLLJXXXXJXXXXYYYYYYYYYYYYYYQQQQQQQQQQQPPPPPPFFFFFLZZZZYYYYYYYCCCCCCCCCAADADDDDDDDDDNNNNNLNNJJJJCCCCZQQFFFSSSFFFSSSSSSSSSSLLPNNNNNNN
+QQYYYYYWWLLLJJJJJJJXXXYYYXXXXXXXXXYYQQQQQQQQQQQPPPPNFFFFFFLLZZZYYYYYYYCCCCCCCCZAAAADDDDDDDDDDNNNLLLLJJJJJCCCQQQFQSSSSFKFSSSSSSSSSSSPPPNNNNNN
+QQQQYYYYWLLLJJJJJJJJJJSNBXXXNXXXUYYYYIIJJJQQBBBPPPPPFFFFFFFZZDYYYYYYYYZCCZCCZZZAAAADDDDLLLDDDDNLLLLJJJJJJQQQQQQQQSSSSKKKKSSSSSSSHSSHHHNDDNNN
+QQQQYYYYWLLLJJJJJJJJJZNNNNNNNJXXUUUYYYJJJJQQQBPPPPPFFFFFFFFKKYYYYYYKYYZZZZTTTTZZAAAAALLLKLLDLDLLLLJJJJJJJQQQQQQQQSSSSKKKKSSSSSSSHHHHHDDDDNNN
+QQQYYYYYYYJJJJJJJJZZZZNNNNNNNNUUUUUUYJJJJJJJJBBPPPFFFFFFFFFKKKKKYYYKKZZZZZZZZZZZZAAAAALLLLLLLLLLLLLLLJJJQQQQQQQQQSSSSSKKKKKSSSSSSHHHHDDDDNNN
+YYYYYYYYYYYJJJJJJJJZZNNNNNNNNUUJJJJJJJJJJJJJJJJBFFFFFFFFFFFFKKKKKKKKKZZZZZZZZZZZAAAAAAAGLLLLLLLLLLLJJJJJJQQQQQQQQSSSSSSKKKKKSSSSTTTTTTTDNNNN
+SYYYYYYYYYYJJJJJJJJZNNNNNNNNNUUUJJJJJJJJJJJJJBBBBBFFFFFGFFFKKKKKKKKKKZZZZZZZZZAAAGGGAGGGLLLLLLLLLLLLJJJQQTQQQQQQQQQSSSKKKKKKKESTTTTTTNNDNNNN
+SCYYYYYYYYYJJJJJJUZZZNNNNNNNNNUUUUJJJJJJJJJJJJBBBBFFFFGGFKKKKKKKKKKZZZZZZZZZZZAAAGYGAGGGGLLLLLLLLLLJJJJQQQQQQQQQQQQSSSSSKKKTTTTTTTTTTNNNNNNN
+SCCYYYYYYJYJJJJJJUUUZNNNNNNNNUUJUUJJJJJJJJJJJLBBBBBGGGGGGKKKKKKKKKKZZZZZZZZZZZAAAGGGAGGGGLLLLLLLLLLLLLJQQQQQQQQQQQQSSSSSKKKTTTTTTTTTTTNNNNNN
+CCCYYYYYJJJJJJJJUUUNZNNNNNNNNNUJJJJJJJJJJJLJJLLLBBBGGGGGGKKKKKKKKKKZZZZZZZZZZAABAGGGGGGGGGGLLLLLLLLLLLQQQQQQQQQQQQQQSSSSKKTTTTTTTTTTTTNNNMNN
+CCCYYYYJJJJJJJUUUUUNNNNNNNNJJJJJJJJJJJJJJJLLLLLLLLBBGGGGGKGKKKKKKKKZZZZZZZZZZZABBBBGGGGGGGGLLLLLLLLLLLQQQQQQQQQQQQQQSSSSKKTTTTTTTTTTTTTMMMNN
+CCCCCYYCJJJJJUUUUUUUNUUNNNNJJJJJJJJJJJJJJLLLLLLLLLLLGGGGGGGKKKKKKKKZZZZZZZZZZZBBBBGGGGGGGGGGGOOLLLLGGGGQQQQQQQQQQQQQSSSKKTTTTTTTTTMMTTTMMMMM
+CCCCZZCCJJJJJUUUUUUUUUUUUUUJJJJJJJJJJJJJZZLLLLLLLLLLFGGGGGGGGGKKKKKZZZZZZZZZZZBBBGGGGGGGGGGGGGLLLGGGGEEEQQQQQQQQQQSQSSSSSTTTTTTTTMMMTTMMMMMM
+CCCCZZZCCCJJUUUUUUUUUUUUUUUJJJJUUJJJJDDJJZZLLLLLLLZZGGGGGGGGGGKKKKKZZZZZZZZZZZBBBBGGGGGGGGGGGGLLGGGGETEEEEQQQQSSSSSSSSSXTTTTTTTMTMMMTTTMMMMM
+CCCCCCCCCCJUUUUUUUUUUUUUUUUUJJJUUUDDDDDJJZZFFLLLFLZZZGGGGGGGGGGKKKKZZZZZZZZZBBBBBBGGGGGGGGGGGGLLLGGEEEEEEEQQJQSSSSUSSSSMMTMMMTTMMMMMTTTMMMMM
+CCCCCCCCCCCUUUUUUUUUUUUUUUUUUJJUUUDDDDDZZZZFFLLLLLLZGGGGGGGGGGGKKKKZZKKKKZZZZBBBBBJBGGGCGGGGGGGLLGGGEEEEEEQQQSSUUUUSSSMMMMMMMMMMMMMMTTMMMMMM
+CCCCCCCCCCCUUUUUUUUUUUUUUUUUUUUUUDDDDDDDZZFFFFLPWWLEGGGGGGGGGGKKKKKKKKKLZZZZZZBBBBJBGCCCCGGGGGGGLGGGEBBEEEEQSSUUUUUSUSSMMMMMMMMMMMMMMMMMMMMM
+CCCCCCCCCCCCUUUUUUUUUUUUUUUUUUUUUUDDDDDZZFFFFPLPWWWEGGGGGGESSSSSSSSSSSLLLLZZBBBBBBBBGGGCCCGGGGGGGGGGGGEEEEEESSUUUUUUUMMMMMNNNNNNNMMMMMMMMMMM
+CCCCCCCCCCCCUUUUUUUUUUUUUUUUUUUUUUDZDDDDZZZZZPPPWWPEEEEEEEESSSSSSSSSSSLLLLLZBBBBBBBBGGCCCXGGGGNNKNGGGAAEEEEEEBBUUUUUMMUMNNNNNNNNNNMMMMMMMMMM
+CCCCCCCCCLLUUUUUUUUUUUUUUUUUUUUUUUUZZZZZZZZPPPPPPPPPEEEEEEESSSSSSSSSSSLLLLLLBBBBBIBBGGCCXXGGNNNNNNGGAAAEAAAENBBUUBUUUUUMMNUNNNNNNMMNMMMBMBBS
+CCYYCCCCCLLLUUUUUUUUUUUUUUUUUUUUUUUZZZZZZZZPPPPPEPPPPEEEEEESSSSSSSSSSSLLLLLBBBBBBBBIIGCCXCCWWWNNZNVGAAAAAAABBBBCBBBUUUUUUNUNNKNNNNNNNMMBBBBB
+YCYYYYYCCLLLUUULUUUUUUUUUUUUUUUUUUUUZZZZZZZPPPPPPPPPPEEEEEKKKSSSSSSSSSLLLLLLBBBBBBIIIIICCCCWWNNNNVVVFAFAAAABBBBBBBBBBBBUUUUUNNNNNNNNNMBBBBBB
+YYYYYYYCLLLLLLLLLUWUUUUUUUUUUUUUUUUUZZZZZZZZPPPPPPPPPEEEEEKKKSSSSSSSSSLLLLLLBBBBBIIIIIIUCFCWWNNNVVVVFFFFAAAABBBBBBBBBBUUUUUUNNNNNNNNABBBBBBB
+YYYYYYCCLLLLLLLCLCCRUUUUUUUUUUXXUUUUZZZZZZPPPPPPPPPPPEEEKKKKKSSSSSSSSSLLLLLLLBBBBBYIIIIIIFFNNNNNVVVFFFFFFFFABBBBBBBBBBBUUUUUNUUNNNNNANNNBBBN
+YYYYYYYYYYPPLLCCCCCCCCUUUUUUUUXXNDNZZZZZZZPPPPPPPPPRREEEEEERASSSSSSSSSLLLLLLLBYBBYYYYYYYIFFNNNNNNVVFFFFFFFFABBBBBBBBBBBBUUUUUUUNNNNNNNNNNNNN
+QYYYYYYYYYPLLLLCCCCCCCCCTTUUUUNNNNNZZZZZZZZPPPPPPPPRNNEEEEEESAAAABBBLLLLLLLLLLYBYYYYYYYYFFKKKKKKKKZFFFFFFFFFBBBBBBBBBBBBUUUUUUUUNNNNNNNNNNNN
+YYYYYYYYPPPPPLLCCCCCCCCCCCAAUUNNNNNZZNNNZPPPPPPPPPPRRREREMESSQAAALLLLLLLLLALAYYYYYYYYYYYFFKKKKKKKKZZFFFFFFFRRRRBBBBBBBBUUUUUUUUUNNNNNNNNNNNN
+EEYYYYYYPPPPPPPCCCCCCCCCCAAAUUNNNNNZZNNNZPPPPPPPPRRRRRRRORRSSQQAAALALLLLLLAAAAYYYYYYYYYNNNKKKKKKKKZZFFFFFFFFRRRBBBBBBBUUUUUUUUUUNNNNNNNNNNNN
+EEYMMPPPPPPPPPPCCCCCCCCCCCCNNNNNNNNNNNNXPPPPPPPPPRRRRRRRRRRRQQQAAAAAALLLLLAAAAYYYYYYYYNNNNKKKKKKKKZZFFFFFFFFRRBBBBBBBBUUUUUUUUUUNNNNNNNNNNNN
+EEYYPPPPPPPPPPGCCCCCCCCCCCDNNNNNNNNNNNNNPPPPPPPPRRRRRRRRRRRYQQQQQQQQALLLAAAAAAAYYYYYNNNNNNKKKKKKKKFFFFFFFFFFFRRRBBBBBRRRUUUUUUUUNNNNNNNNNNNN
+EEENNPPPPPPPPGGCMCCCCCCNNNNNNNNNNNNNNNNNPPPPPPPPRVRVRRRRRRYYYFQQQQQEQQQVAAAAAAAYYYYYYNNNNNKKKKKKKKKKKKFFFFFFFFFBBBCCBRRRRRUUUUUUNNNNNNNNNNNN
+EEEPPPPPPPPPPPPCMCCCCCCNNNNNNNNNNNNNNNNNKPPPPPPPPVRVRRRRRYYYYFQQQQQQQQQQQAAAAAAYYYYYYNNNNNKKKKKKKKKKKKFFFFFFFFFFFFFCRRORRRRUUUUUNANNNNNNNNNN
+EEEPPPPPPPPPPPMMMMCCCICMMNNNNNNNNNNNZNNNTTPTTPPPVVVVRRRRRYYYYQQQQQQQQQQQQQAAAAAYYYYYNNNNNNNNNKKKKKKKKKFFFFFFTCCCCCCCRRRRRRRUUIUNINNNNNNNNNNN
+EEELPPPWWPPPMMMMMMCCCCCCMMMNNNNNNNNNZNNZTTTTTPPTVVVVVRRRYYYYQQQQQQQQQQQQAAAAAAYYYNNNNNNNNNNNNKKKKKKKKKCCCTTTTTCTTRRRRRRRRRTIIIINNNNNNNNNNNNN
+UUEEEPPWMPPPPMMMMMCCCCCMMMMNNNNNNNZZZNNZTTTTTYTTVVPPVVRRRYYYYQQQQQQQQQQASAAYYAYNNNNNNNNNNNNNNNYCKKKKKKCSSTTTTTCTTTTRRRRRRTTTIITTNNNNNNNNNNNN
+UUUUMMMMMPPPMMMMMMCMMMMMMMMNNNNNNNZZZZZZCTTTTTTTPPPPVVVRRRRYYQQQQQQQQQQAAAYYYYYYNNNNNNNNNNNNCYYCCCCCCCCCCTTTTTTTTTTERRRRRRRTTITTNNNNNNNNNNNN
+UUUMMMMMPPMMMMMMMMMMMUUMMNNNNNNNNNZZZZZCTTTTTTTQPPPPVPPPYYYYYYQQQQQQQQQQEAAYYYYYYNNNNNNNNNNCCCCCCCCCCCCCTTTTTTTTTTTRRRRRRRRTTTTTNTNNNNNNNNNN
+UUMMMMMMMMMMMMMUMMMMMMUUMMMNNNNNNNZZZZOTTFTTTTTQPPPPPPPPBYYYYQQQQQQQQQQQQYYYYYYYYYNNNNNNNANCCJCCCCCCCCCCTSTTTTTTTTTTTTRRRTTTTTTTNTNTTNNNNNNN
+UMMMMMMMMMMMMMMUUUUUMUUUMMMNBNNNNZZZZZZZFFFFTTTTPPPPFPPPBYYYQQQQQQQQQQQQCQYYYYYYYYYNNNNNNCCCCCCCCCCCCCCCCCTTTTTTTTTTTTRRTTTTTTTTTTTTTNNNNNNN
+UUMMMMMMMMMMMMMUUUUUUUUUUMMMBNNNZZZZZZZZFFFFUUTPPPPPPPPBBYYYQWQQQQQQQQQQQQQYYYYYYYYNNNNNNCCCCCCCCCCCCCCCCCTTTTTTTTTTTTTTTTTTTTTTTTTNNNNNNNNN
blob - /dev/null
blob + 75534d6801ddc0166e81fe9ae38966f4a66d8bb5 (mode 644)
--- /dev/null
+++ src/day-12.lisp
@@ -0,0 +1,68 @@
+(defpackage #:aoc/day-12
+  (:use #:cl #:aoc/utils)
+  (:export #:day-12))
+(in-package #:aoc/day-12)
+
+(defparameter *neighbour-diffs* '((0 . -1) (-1 . 0) (1 . 0) (0 . 1)))
+
+(defun walk-line (pos-1 pos-2 positions visited diff)
+  (loop for current-1 = (point+ (or current-1 pos-1) diff)
+        for current-2 = (point+ (or current-2 pos-2) diff)
+        for set = (list current-1 current-2)
+        while (and (gethash set positions)
+                   (not (gethash set visited)))
+        do (setf (gethash set visited) t)))
+
+(defun find-straight-fences (positions)
+  (loop with visited = (make-hash-table :test #'equal)
+        with fences = 0
+        for set being the hash-key of positions
+        for diffs = (if (= (point-x (point- (first set) (second set))) 0)
+                        '((-1 . 0) (1 . 0))
+                        '((0 . -1) (0 . 1)))
+        do (unless (gethash set visited)
+             (loop for diff in diffs
+                   do (walk-line (first set) (second set) positions visited diff))
+             (incf fences)
+             (setf (gethash set visited) t))
+        finally (return fences)))
+
+(defun region-properties (map point visited width height)
+  (setf (gethash point visited) t)
+  (loop with plant = (map-cell map point)
+        with fences = 0
+        with fence-positions = (make-hash-table :test #'equal)
+        with todo = (list point)
+        with area = 0
+        while todo
+        for current = (pop todo)
+        do (incf area)
+           (loop for neighbour-diff in *neighbour-diffs*
+                 for neighbour = (point+ current neighbour-diff)
+                 for in-bounds = (point-in-bounds-p neighbour width height)
+                 for neighbour-plant = (and in-bounds (map-cell map neighbour))
+                 do (if (and in-bounds (char= plant neighbour-plant))
+                        (unless (gethash neighbour visited)
+                          (push neighbour todo)
+                          (setf (gethash neighbour visited) t))
+                        (progn
+                          (incf fences)
+                          (setf (gethash (list current neighbour) fence-positions) t))))
+        finally (return (values area fences (find-straight-fences fence-positions)))))
+
+(defun day-12 (input)
+  (loop with map = (make-map input)
+        with visited = (make-hash-table :test #'equal)
+        with cost-1 = 0
+        with cost-2 = 0
+        with width = (input-map-width map)
+        with height = (input-map-height map)
+        for y from 0 below height
+        do (loop for x from 0 below width
+                 for point = (cons x y)
+                 unless (gethash point visited)
+                   do (multiple-value-bind (area fences straight-fences)
+                          (region-properties map point visited width height)
+                        (incf cost-1 (* area fences))
+                        (incf cost-2 (* area straight-fences))))
+        finally (return (values cost-1 cost-2))))
blob - /dev/null
blob + 58b618d8755218d1b7eac5c14d629ec026c6d673 (mode 644)
--- /dev/null
+++ t/day-12.lisp
@@ -0,0 +1,43 @@
+(defpackage #:aoc-test/day-12
+  (:use #:cl #:lisp-unit2)
+  (:import-from #:aoc/day-12))
+(in-package #:aoc-test/day-12)
+
+(define-test test-day-12
+    ()
+  (multiple-value-bind (task-1 task-2)
+      (aoc:run-day 12 "AAAA
+BBCD
+BBCC
+EEEC")
+    (assert= 140 task-1)
+    (assert= 80 task-2))
+  (multiple-value-bind (task-1 task-2)
+      (aoc:run-day 12 "OOOOO
+OXOXO
+OOOOO
+OXOXO
+OOOOO")
+    (assert= 772 task-1)
+    (assert= 436 task-2))
+  (assert= 1930 (aoc:run-day 12 "RRRRIICCFF
+RRRRIICCCF
+VVRRRCCFFF
+VVRCCCJFFF
+VVVVCJJCFE
+VVIVCCJJEE
+VVIIICJJEE
+MIIIIIJJEE
+MIIISIJEEE
+MMMISSJEEE"))
+  (assert= 236 (nth-value 1 (aoc:run-day 12 "EEEEE
+EXXXX
+EEEEE
+EXXXX
+EEEEE")))
+  (assert= 368 (nth-value 1 (aoc:run-day 12 "AAAAAA
+AAABBA
+AAABBA
+ABBAAA
+ABBAAA
+AAAAAA"))))