diff --git a/23/elixir/inputs/day12.txt b/23/elixir/inputs/day12.txt
new file mode 100644
index 0000000..4c0a08d
--- /dev/null
+++ b/23/elixir/inputs/day12.txt
@@ -0,0 +1,1000 @@
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+?#.???.?#??#????? 1,1,2,7
+.???#.?#?.? 1,2
+#?#?#???????.? 3,8
+?.#????????.?.??.#. 1,7,1,1,1
+???????#????.?#. 10,2
+??.?????#? 1,5
diff --git a/23/elixir/inputs/day12_example.txt b/23/elixir/inputs/day12_example.txt
new file mode 100644
index 0000000..e925935
--- /dev/null
+++ b/23/elixir/inputs/day12_example.txt
@@ -0,0 +1,6 @@
+???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1
diff --git a/23/elixir/inputs/day18.txt b/23/elixir/inputs/day18.txt
new file mode 100644
index 0000000..395f0df
--- /dev/null
+++ b/23/elixir/inputs/day18.txt
@@ -0,0 +1,618 @@
+L 4 (#6c74e0)
+D 4 (#1afab1)
+L 4 (#0b54a0)
+D 18 (#3533c1)
+L 3 (#411270)
+U 14 (#121ed3)
+L 4 (#17e0f0)
+U 10 (#113841)
+L 8 (#4fa040)
+U 13 (#113843)
+L 3 (#1b7fb0)
+U 7 (#121ed1)
+L 10 (#005ed0)
+D 4 (#502e73)
+L 5 (#47ebf0)
+D 10 (#2d9421)
+R 7 (#2d4360)
+D 8 (#2d9423)
+L 7 (#2164d0)
+D 8 (#530f03)
+L 9 (#14d330)
+D 14 (#1c6c43)
+L 8 (#5133e0)
+U 13 (#2ec813)
+L 7 (#2c56a0)
+U 6 (#2b50c3)
+L 14 (#465990)
+U 3 (#5c9e03)
+L 6 (#052cf0)
+U 7 (#09d973)
+L 10 (#3500b0)
+D 11 (#088d63)
+L 11 (#473f60)
+U 11 (#405733)
+L 5 (#414100)
+U 5 (#10b5b3)
+L 9 (#624920)
+U 8 (#10b5b1)
+L 10 (#02a810)
+U 7 (#29a8c1)
+L 14 (#6896c2)
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+U 4 (#399321)
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+R 6 (#49fe20)
+U 13 (#1c3d03)
+R 9 (#4f4362)
+U 3 (#0ba303)
+R 8 (#75c3f2)
+U 13 (#3e1493)
+R 12 (#0af520)
+U 6 (#3dc1b3)
+L 4 (#0e7730)
+U 2 (#36f991)
+L 8 (#565800)
+D 5 (#36f993)
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+U 3 (#3da6b3)
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+U 8 (#6c3473)
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+D 5 (#34c7d1)
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+D 4 (#00bec1)
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+R 6 (#14ae52)
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+U 11 (#1c1a93)
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+U 8 (#25ae53)
diff --git a/23/elixir/inputs/day18_example.txt b/23/elixir/inputs/day18_example.txt
new file mode 100644
index 0000000..fc7612e
--- /dev/null
+++ b/23/elixir/inputs/day18_example.txt
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
diff --git a/23/elixir/inputs/day19.txt b/23/elixir/inputs/day19.txt
new file mode 100644
index 0000000..05eb616
--- /dev/null
+++ b/23/elixir/inputs/day19.txt
@@ -0,0 +1,728 @@
+fxg{x<2288:tn,m<3059:mlg,xl}
+fdl{m>3467:A,s<1414:A,s>2068:A,A}
+fzv{m<82:R,m>134:A,s>1033:R,A}
+fmd{a>3959:A,R}
+xx{s>1478:shz,s>972:tfm,a>3810:jvb,lfb}
+cjj{m<2288:R,a>3822:A,A}
+qht{a<2481:vk,m>987:thk,s>2051:xkl,mz}
+ds{a>2589:A,R}
+ts{s<1928:A,A}
+cb{s<3311:R,s<3404:R,R}
+qcm{s>838:A,R}
+xxz{m>2772:dpn,A}
+zbx{s<2149:R,m>1885:R,s<3157:A,R}
+mdq{m>2002:sg,a>3908:gz,m<1702:np,gxm}
+rlm{m<2733:R,m>2925:lhf,s<2207:msh,gjh}
+zlx{m>2987:R,s>1645:R,R}
+ngc{m<3821:A,A}
+mjq{s>1671:A,s<1484:A,A}
+bk{a<3273:A,m>3695:pkb,m<3584:R,dzk}
+mvc{m>3223:R,A}
+xl{s>677:A,m>3381:A,A}
+pm{s>2238:srn,dxg}
+szv{a<1654:krs,a<3133:fnm,m<3024:gpl,lh}
+tdp{m<3483:mnh,a<3418:xrv,sf}
+kgk{x<1234:fbd,pjk}
+xkl{a>2755:kd,x>1913:vv,R}
+jx{a>3102:rzg,gsm}
+pz{x<1357:R,s<338:R,R}
+ztx{m>3558:kfs,s<1441:chq,x>2307:A,A}
+jp{m<1022:R,a<401:hrk,x<2481:A,lfr}
+nbp{x>3585:A,A}
+lqv{x<1820:A,A}
+hbd{a<387:hgd,nt}
+hh{s<760:R,s>1049:A,A}
+hbv{s>2416:A,m<1490:A,m<1526:R,R}
+fq{s<490:R,R}
+kql{s>1995:A,a<3405:R,A}
+bhl{s>3286:dzj,m<3238:csn,vn}
+nfs{m>454:A,x>2121:R,A}
+vvd{m<45:A,s>2313:rr,m>86:A,vdx}
+msm{m>410:hfx,m>213:qdk,a<3545:bd,xp}
+zpt{s<393:fj,a<3968:R,x<989:R,vgm}
+qc{x<1556:A,R}
+tm{a>3874:R,s<3072:A,s<3430:A,A}
+hxg{a>459:A,m<3846:A,A}
+vrh{s>513:fxg,m>3140:mhj,a<2061:bv,zk}
+pn{x>221:R,m>2805:A,R}
+pb{x>2748:R,x>2190:A,m>343:R,ln}
+zn{x>2133:xm,x<813:tb,s>252:pz,R}
+jls{x<2268:A,m<422:R,a<2257:R,A}
+pl{s>2588:A,s<975:smm,jlr}
+kt{s<2491:R,s<2547:A,x<2548:A,A}
+xrv{s>1456:bk,fq}
+cs{x<1649:R,A}
+hq{m>3164:rv,x>594:R,sjl}
+qvr{s>457:R,a<1922:R,R}
+cz{m>2163:R,m<1830:lqv,tbg}
+mnm{x<2059:R,A}
+msh{a>3672:A,x>2294:R,A}
+jh{a>447:A,m>3125:R,R}
+btl{s<1969:rmb,A}
+nxj{a>1150:R,x<1570:A,A}
+hcc{s>3619:R,m<3681:A,s<3546:R,A}
+jnt{s>3000:ksn,a>3744:A,xlp}
+ck{m>3636:hxg,a>265:R,a>134:R,mt}
+kr{s>591:R,s<285:gj,x<1120:R,mnm}
+jtl{m<2676:ljt,a>3746:R,pn}
+tdj{x<3002:R,R}
+pf{s<3426:qjt,s>3624:nsl,xjk}
+pj{s>1859:R,R}
+xz{s>2322:pf,m>2095:pvb,ss}
+bl{x>1072:R,vrf}
+hrk{a>204:R,R}
+vv{s>2378:A,A}
+px{a<3676:R,R}
+cth{s>1089:R,x<1723:A,A}
+vd{s>670:A,m<2596:A,x>1199:R,A}
+hvb{x>1121:A,x<581:znp,A}
+gn{m<920:gml,x<2325:kgk,rlx}
+csn{x>893:R,s<2824:mnv,qn}
+scs{m<3673:R,x<1134:A,a<3671:A,A}
+ss{s<1302:zfx,x>815:hf,btl}
+sjl{x>263:R,A}
+tfm{a<3703:A,s<1173:R,dxt}
+hfx{s>1106:A,s<547:bx,dj}
+qt{a>3806:xlm,s>1595:bj,a<3717:xs,mmf}
+mlg{x>3146:R,s>721:A,A}
+gkm{a>660:R,A}
+txg{s>810:R,m<3165:R,a<3430:R,R}
+pvb{s<1031:qql,a>3301:jln,vf}
+fxb{a<3859:pkq,mdq}
+ljt{x>237:A,a>3840:R,R}
+jcm{x>3322:A,A}
+mqs{a<3643:pqp,a<3769:tbm,s<2584:fxb,tbs}
+lxk{a>2753:qdm,a>2621:tlp,cq}
+tbg{m<1957:A,m>2053:R,m>1999:R,R}
+gdk{s<1637:A,A}
+bv{s<197:xjx,a>1986:zp,R}
+xnj{m<3359:R,m>3463:R,m<3428:R,A}
+gv{s>1869:zqk,txp}
+jln{x>679:gp,s<1624:R,s<2011:crb,xqx}
+ft{s<1931:A,m>277:A,A}
+fxr{m<2870:cgn,x>961:vm,m<3322:R,A}
+jrb{s<3400:R,x>1684:R,x>1454:R,A}
+dsd{a>3907:A,mf}
+rp{s>3309:R,x<1004:A,jbs}
+jlr{x>3494:A,m<3218:A,R}
+lhd{x<814:R,x<1071:R,R}
+thl{a<3885:R,s<3770:A,R}
+qp{a<1700:A,m<1132:R,s<962:A,A}
+xmg{m>3765:kb,s>2035:msf,s<1048:fx,lj}
+sg{x>2270:A,R}
+vtr{s>473:A,x>460:R,R}
+zk{a<2113:bhg,m<2164:A,R}
+gml{a<2183:jz,x>2629:fh,a>2379:kr,vl}
+phl{a>1213:xnk,x>2508:lq,dsp}
+grr{a>3924:zvv,a<3874:bmb,xv}
+mz{s>1916:A,m<924:dtb,a<2668:A,zv}
+dr{a>830:R,m>2354:R,lr}
+mmp{m>3723:zqr,m<3706:R,s<580:R,A}
+srn{m>1115:A,s>2393:R,A}
+mhj{x>2438:A,dl}
+mq{m<204:lc,x>1107:cc,A}
+tbs{s>3146:mjl,dsd}
+mmf{x>1280:R,s<937:R,A}
+ksn{a>3701:R,m>3252:A,R}
+spn{x>1838:R,x<1168:dzc,s>1037:A,qc}
+vbf{a<3249:R,s<2020:R,R}
+gt{s<2374:A,s<2461:A,R}
+lg{m>867:A,x<1356:R,s>3363:R,R}
+hr{a>3739:A,x>339:R,R}
+fh{a<2473:A,a>2541:A,x>3430:cr,A}
+tk{m>2064:R,m<1828:R,A}
+mmc{s<3055:R,R}
+flh{s>2954:A,x>3012:A,x<2516:R,A}
+stn{s>1855:zl,a<3682:A,tk}
+lt{a<2953:sm,m>140:tdj,kql}
+pjh{s<3223:R,s>3319:R,x<1248:A,R}
+cd{m<3499:pl,gb}
+zfx{x<859:vtr,x<1065:R,lqm}
+kbx{x>2196:tst,ctc}
+ktq{s<1368:A,R}
+spg{a<2022:A,m<2383:R,x<852:kxh,A}
+kb{a>3815:grr,s>2167:rp,hbm}
+vnh{x>2559:qvh,rb}
+xk{s<973:A,s>1418:R,A}
+zz{m<3797:pbt,R}
+nrs{m<2763:R,a>2242:R,s>2010:A,A}
+xqr{a<1948:bts,s>995:fpx,vrh}
+tb{s<238:R,R}
+qdx{x<582:csj,xx}
+vts{a<3055:R,a>3208:A,a<3112:A,A}
+fbd{a<1902:qp,nn}
+smm{a<3598:A,x>3526:R,m<3214:R,R}
+xs{s<1042:R,a>3659:A,A}
+zc{a>2724:R,m<951:R,x>2100:R,R}
+csj{m<2472:tq,s<2587:jtl,a>3749:fd,bbd}
+rq{m>3626:A,a>2389:A,R}
+ckk{s<721:qvr,a>2023:R,x>3096:R,A}
+znp{x<195:R,x>385:A,a>3930:A,R}
+hz{m<565:A,a>732:A,m>770:A,R}
+zv{x>1524:R,x>740:A,s>1835:R,R}
+zp{x<2081:R,A}
+qgf{s<801:A,a<3653:A,s>1342:A,R}
+tp{a>3371:zrk,R}
+gm{a>937:mmc,x<833:fp,jh}
+msf{s<2813:hnx,m<3701:jj,s<3492:ls,xt}
+dxt{x>924:A,m<2200:A,A}
+gpl{x>1337:mqs,a<3544:xz,qdx}
+kjr{x<2252:A,m<2340:R,R}
+xqx{x>414:A,m<2609:R,s<2216:A,A}
+fn{x<1666:tzd,m<1371:pq,ph}
+lqm{a>3330:A,m>1880:R,x<1195:R,A}
+ssj{m>1131:cxm,m<992:A,x>2550:txx,R}
+gxm{a<3878:A,s<1216:A,A}
+pgk{x>1554:R,m>2073:A,m>1777:A,A}
+cf{s>3103:A,R}
+bnq{m<2544:R,m<3510:R,R}
+sx{s<1453:dnl,m<1270:clq,zd}
+nc{m>1030:A,a>3768:R,R}
+flx{x<2558:A,m<1299:R,A}
+rh{m<1142:rcq,a>3251:qpc,x<1463:rd,A}
+vm{a>1836:R,s>1532:R,R}
+qfc{x>1563:A,x>1412:R,A}
+pkb{a>3343:A,R}
+qn{m<3164:A,x<359:A,m<3195:A,A}
+hpk{a<3860:A,m>2285:A,x<982:A,A}
+vdx{s>2213:A,s>2184:A,x>2983:R,A}
+nkm{m<3672:A,a<3571:R,m<3811:A,A}
+rx{x<2190:fxx,dx}
+hgd{m<981:A,A}
+szs{m<2528:fv,m>3232:pj,zlx}
+vz{x>1069:R,x<426:R,zg}
+vk{m<1038:A,shc}
+kk{m>2465:R,s>2032:R,A}
+rk{s<3088:kmf,x<2955:pqk,s<3479:th,zb}
+pkq{s<1716:cjj,s>2162:A,s<1905:vc,R}
+bsx{x<370:R,m>2899:R,A}
+qpm{s>3450:pp,bl}
+pp{x<955:mh,x>1395:R,R}
+tst{x>2877:bnq,R}
+dhm{m<3479:xsg,mv}
+fpx{x<1855:spg,szs}
+mdh{a>3390:A,m<2131:A,s<3506:A,R}
+phj{a>2554:lxk,s<2157:nj,s>3251:kbx,vnh}
+hn{x>557:R,m<152:A,A}
+fnm{a>2161:phj,s<2559:xqr,vs}
+xzp{a>3400:A,a<3357:A,R}
+dm{x>971:A,s<1707:A,s>1743:R,A}
+fmt{x>3561:A,A}
+tc{m<3759:R,m<3761:R,A}
+zcq{s>953:gl,A}
+qvh{m>3005:rq,a>2368:skg,qq}
+xbg{a<2362:rkm,a<2427:A,A}
+bgs{s>3730:A,x>2093:A,A}
+vt{m<287:R,R}
+vzs{x>2122:mdc,R}
+dt{a<322:A,a<494:R,A}
+kcd{m<2490:R,R}
+bhg{a<2083:A,x>2127:R,A}
+lc{x>1216:A,A}
+lz{x>2398:A,m>1162:R,R}
+mnh{m>3327:vz,x>1160:vtx,hq}
+htm{x>2296:zkf,s>2077:jth,hnc}
+tn{a<2020:R,R}
+jzm{x>3227:A,R}
+tj{a>3813:A,A}
+fp{m>3076:A,a>493:R,m>2934:A,R}
+rts{a<3848:nc,m<1013:bs,m<1078:tpk,lvh}
+kl{m>767:R,s<2165:R,s<2258:R,A}
+xr{x>1462:pb,x>820:mq,fdr}
+sm{x>3094:A,A}
+lr{m>1863:A,R}
+dzj{x>1287:qfc,s<3612:lhd,thl}
+bd{m>83:cth,s<970:jfs,db}
+fdr{a<520:qd,s<892:A,R}
+kfs{s>1567:R,a>3288:R,A}
+gl{s>1251:R,m>949:R,R}
+gx{a>3225:A,x>524:A,m>2467:R,A}
+bs{x<1767:R,m>949:R,s>2069:R,R}
+gmn{m>3647:R,a>3720:A,s<2882:R,R}
+nh{m>538:A,A}
+nv{m<3608:dt,m>3822:rhv,a<376:jtn,R}
+xnk{a>1282:zhs,m>1091:flx,lg}
+sl{x<943:hr,x<1538:hs,R}
+pbz{s>2319:rct,a>750:R,kl}
+xjx{x>1490:R,x>948:R,x<374:R,R}
+hf{s>1961:A,mjq}
+fr{x<2009:pbz,m<909:zjk,a<1227:tt,pm}
+qpc{x>1774:R,x<1034:A,A}
+nx{s>3695:A,a<458:R,A}
+xlp{s>2692:R,x>1500:R,a<3692:A,A}
+vrf{a>1813:A,x<675:A,m>2397:A,R}
+fx{a<3858:dq,m<3684:hvb,a>3947:zpt,mmp}
+dvz{s<2448:R,x<1803:nkm,a>3561:hfg,A}
+nt{s<3265:R,s>3609:R,A}
+lk{x>1092:R,A}
+gb{m<3766:px,jcm}
+tzd{x>643:R,m>1402:R,A}
+gj{s<181:R,s>242:A,R}
+lst{x>2139:hbd,x<1078:npf,lpq}
+kf{s<1698:tf,ftj}
+fd{x<225:A,x<444:R,tm}
+gp{x<944:A,x<1151:A,A}
+djs{x<1630:A,s<1045:A,A}
+vc{m<2251:R,m>2675:A,s<1784:A,R}
+mcv{x<1158:R,A}
+sr{s>637:R,A}
+xp{a<3809:qgf,a>3876:cs,fzv}
+zq{a<2371:R,R}
+sn{a<574:R,s<3238:A,s>3608:A,R}
+prx{s>3406:R,A}
+gsm{a<2825:zc,s<779:xb,m<880:A,bm}
+qns{a>3713:R,A}
+jth{m<3374:gm,a>776:nxg,x<1068:nv,ck}
+qqn{s>2266:lqh,jf}
+nsl{s>3816:A,a<3396:A,R}
+tt{x>3233:nbp,A}
+jbs{x<1614:A,A}
+xj{s>2368:R,a>2424:R,s>2314:R,A}
+xv{s<1349:A,R}
+qqf{x>1015:jnt,qmk}
+ztb{x<772:R,A}
+qnr{m<3763:A,m<3892:R,R}
+nn{s>775:A,x<470:R,R}
+bbd{m<2836:R,bsx}
+nj{s<1347:xbg,a<2328:bcz,cx}
+lrg{a>3925:R,A}
+jd{x<3255:R,a>1048:A,a<984:A,A}
+qql{x<857:A,R}
+hfg{a>3587:R,s>3271:R,R}
+spc{a>3762:R,a<3682:R,s>1915:A,A}
+skg{s>2718:A,m<2395:A,s>2452:A,A}
+mzg{s>258:R,x<1217:R,A}
+bx{m<551:A,R}
+lfb{x<1060:R,s<416:mzg,m<2306:sr,vd}
+pv{a<3182:R,m<600:R,R}
+fv{a>2031:A,a<1998:R,x<3117:R,R}
+lqb{x<937:A,a<2879:R,m>152:A,A}
+shz{a>3752:hpk,a<3647:R,A}
+cxc{a<1094:R,a<1220:A,R}
+th{m>2853:R,a>1789:cb,hgq}
+thk{m<1092:A,a>2706:vq,A}
+fj{x<730:A,s>180:R,m<3718:A,R}
+gjh{s<3014:R,A}
+bts{x>1336:dv,x<614:fpm,fxr}
+bpc{m>2876:frp,cz}
+fxx{x>1291:sv,a>821:cxc,jg}
+kdt{x>1408:A,x<526:A,a>2495:A,R}
+xnx{s<2569:tz,s<3106:gmn,A}
+bnt{s>3072:kh,x>1617:A,s<2861:A,A}
+nqb{m>787:bnt,mtl}
+fgj{x<982:pld,m<3732:mkh,R}
+vmp{a>377:A,s>3562:A,A}
+mt{x<1659:R,x>1949:R,a<86:A,A}
+jjr{a<3524:md,pk}
+nf{a>3693:A,m>3721:A,x<1258:R,A}
+kmf{m>2616:A,ch}
+qqm{m<759:msm,m<1066:jx,s<1072:mbx,sx}
+npf{s>3135:nx,a<607:A,a<735:A,R}
+zfz{a<593:R,m<1173:R,m<1287:R,A}
+qd{x>400:R,a>333:A,s<926:A,A}
+md{m>3814:A,A}
+dl{s>329:A,R}
+xns{s<1829:A,spc}
+mf{x>2942:R,x<1923:R,A}
+pc{x>578:R,s<1159:R,s<1501:A,R}
+js{x<1654:A,A}
+ph{x<2673:A,a<3382:A,R}
+mdc{x>3156:A,A}
+kd{s>2236:A,a<2877:A,s>2169:A,A}
+stv{x<1621:A,A}
+ttf{s<2002:gv,fr}
+fc{a>2299:R,x>1400:A,R}
+llx{m<1282:hvf,R}
+txx{m<1072:R,m>1107:R,A}
+tpk{m>1055:A,a<3918:R,s<2145:R,R}
+gz{s<1406:A,s>2050:R,A}
+clq{s<1549:lz,R}
+vtz{a>1307:R,R}
+xh{x>1990:R,s>2577:A,R}
+dxg{s<2121:R,m>1223:A,s>2179:A,R}
+jj{m<3671:lk,s<3497:R,s>3723:xdd,hcc}
+dlh{m>2519:R,a>2691:R,R}
+zkf{m>3525:fmm,s>1899:jzm,fkp}
+bcz{s<1775:R,nrs}
+hnx{m>3695:R,qk}
+frp{s<3328:A,bgs}
+jb{x>3417:R,m<3694:R,R}
+htj{s<903:dr,jvf}
+qdm{x<2036:vj,s<1607:hh,flh}
+xn{a<561:R,m<3597:A,m<3806:stv,R}
+tlp{x<2194:dlh,A}
+bm{m>977:R,s<1159:A,a>2980:A,R}
+cr{m<444:R,a<2515:R,a<2529:R,A}
+cq{s<1598:kx,x>2199:ds,a>2582:R,mcv}
+jg{x>719:R,a<322:A,m>425:R,R}
+kx{a<2578:R,m<2783:R,R}
+rmb{m>1701:R,s>1741:R,R}
+cx{s<1842:kjr,a<2456:A,s<2046:ts,kdt}
+dh{a>1396:nqb,m<707:rx,a<911:lst,phl}
+rkm{s>624:A,m<2304:R,a>2285:R,A}
+dj{s<896:R,s>1021:A,A}
+jfs{m>50:A,m<30:A,A}
+bj{s>1901:xnj,s<1781:dm,R}
+sdm{s<2101:A,s<2351:R,A}
+cnb{a>669:gfj,xh}
+jvb{x<1067:nnl,a<3877:R,x>1216:R,A}
+td{x<1697:pv,m>565:st,bzm}
+bzm{m<433:sdm,a<3012:R,A}
+jtn{a<200:R,x>576:A,x>340:A,R}
+rct{x>835:R,a>1372:A,A}
+pbt{m>3727:R,a<3631:A,x<2581:R,R}
+vtx{s<2246:txg,x>1434:cf,rrx}
+hfs{m<3564:mvc,x>2387:xzp,s<1647:qcm,A}
+ctc{s<3638:fc,R}
+lvh{m>1112:A,m<1095:R,x<1917:A,R}
+km{a>3774:A,m>3368:A,s<2096:R,A}
+hg{s<2175:A,s>2402:lqb,hn}
+mv{a<3791:A,a>3912:prx,R}
+pq{s<395:R,s>768:A,m<1330:R,R}
+mnv{a>3937:R,R}
+cgn{s>1534:A,a<1782:A,A}
+hfj{a<1252:A,m<3238:A,s>1189:R,A}
+vgm{x>1551:A,s>726:A,A}
+xdd{a>3845:A,m>3687:R,R}
+mjl{s>3637:R,s<3353:nz,A}
+kdd{x<3760:fmt,x<3872:A,m<1006:A,R}
+sz{s<2416:A,a<3004:kt,R}
+xjk{a<3328:R,a>3466:R,mdh}
+tf{a<1495:lsl,a>2641:qqm,gn}
+rcq{s<784:R,x<1815:A,A}
+pqk{m<2915:vfv,m>3530:R,R}
+lj{m<3698:sl,s<1487:fgj,xns}
+bt{m>3937:A,R}
+mjn{a<3737:A,a<3910:R,fmd}
+bzn{m>1148:tg,a>2948:cvg,qht}
+vj{s<2479:R,m>2514:R,s>3114:A,A}
+pk{m<3785:R,m<3925:A,A}
+rd{s<770:R,x<757:A,s<872:A,A}
+hnc{x>1219:xn,gkm}
+qk{x<894:R,m<3674:R,R}
+nnl{s>432:A,R}
+lhf{s>1783:A,m>2962:A,R}
+rtk{x<590:R,x<975:R,a>3259:R,A}
+zd{m<1376:zh,s<1580:R,lxg}
+hs{s<1492:R,m>3665:R,A}
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+rrx{m<3208:R,x>1262:R,x>1206:R,R}
+fkp{a<1091:R,a>1372:A,hfj}
+qq{s>2866:A,R}
+txp{s<1757:nh,lnz}
+qcf{s>3084:R,A}
+chq{x<2326:A,s>790:A,x<2514:R,R}
+zrk{x>2475:R,m<2352:R,A}
+hc{s<3171:cnb,vzs}
+pdv{s>1694:hc,htj}
+mtl{a>2562:A,s<3387:nfs,a<1966:R,R}
+sv{s<3288:R,x<1848:A,R}
+cj{m>522:A,R}
+nz{x<3106:R,a>3915:R,A}
+vgd{x<207:R,m>2937:R,a<1846:A,A}
+rzg{a>3598:hts,R}
+dzk{s>2875:R,a<3368:A,R}
+fmm{s>1385:A,a>817:A,jb}
+kxh{x<512:A,x>704:R,A}
+xm{x>3079:R,R}
+rlx{x<2946:ssj,x<3395:ckk,m<1126:kdd,qsz}
+cxm{m<1297:R,A}
+xlm{m<3363:lrg,fdl}
+qsz{a>2068:zq,R}
+gh{x<2722:km,x>2801:R,m<3266:R,R}
+vs{a>1978:bpc,x<2043:qpm,rk}
+fpm{s>1180:vgd,x<258:R,A}
+zb{s>3696:R,xg}
+vfv{x>2448:R,m<1999:R,R}
+jvf{a>1057:pgk,R}
+zj{a<2790:xj,a>3352:A,x<1345:tqd,vts}
+hkr{a>3732:A,x>711:R,A}
+dsp{a>1078:nxj,m>975:A,A}
+dx{x>2822:R,sn}
+hd{s<2428:qt,m>3374:dhm,a<3823:qqf,bhl}
+ftj{s>2579:dh,a<2113:ttf,m<892:mx,bzn}
+mkh{m<3720:A,s>1274:A,R}
+vl{x>1641:jls,x<807:A,s>913:ktq,cj}
+crb{a<3406:A,R}
+dq{m>3694:A,x<678:R,a>3755:A,scs}
+qjt{a<3401:rtk,a>3454:ztb,A}
+np{x<2860:A,R}
+rv{x<763:A,A}
+bf{s<1946:A,R}
+pjk{s>618:djs,R}
+vx{x>1751:A,R}
+gfj{x>2306:R,R}
+cvg{a<3628:qqn,rts}
+dhg{m>1688:zbx,m>1551:A,hbv}
+zqr{m<3749:A,x<987:R,a>3895:A,A}
+sf{x<1168:qnr,x<1554:jjr,a>3519:dvz,ngc}
+blz{x<2324:xnx,m>3634:zz,x>2570:gh,mjn}
+zg{a>3363:A,m>3389:A,R}
+lxg{s>1646:R,s<1608:A,s>1631:A,R}
+vn{s<2757:zr,a<3910:A,a>3961:A,A}
+dnl{s>1311:vx,a<3248:A,qm}
+qm{a>3722:A,R}
+jf{m<994:A,R}
+lq{s<3179:A,jd}
+lpq{s>3282:vmp,s>2926:A,s<2718:zfz,A}
+ls{m<3734:pjh,m>3754:tc,s<3231:R,R}
+zh{a<3367:A,s<1566:A,s<1637:A,A}
+vf{s>1463:kk,s>1304:A,gx}
+kh{x<1450:A,A}
+rhv{s>3306:R,A}
+pld{s>1209:A,a<3823:A,x<409:R,A}
+lfr{x<3457:A,a<669:R,A}
+zhs{s<3266:A,a>1355:A,x>2573:R,R}
+dpn{m<2862:R,x>2400:A,R}
+zl{x>2727:A,x>2192:A,A}
+tz{s>1150:R,s>426:R,s<176:A,R}
+krs{m<2856:pdv,htm}
+tqd{a<2979:A,x<502:A,m<1339:A,A}
+ch{x<2847:A,m>1957:R,R}
+pqp{m<2055:dhg,m<2603:tp,xxz}
+lh{x>1949:gf,a<3601:tdp,m<3635:hd,xmg}
+hvf{a>2819:A,x<1830:R,R}
+zvv{a<3953:R,R}
+dzc{m>950:A,R}
+mx{m>308:td,tvp}
+xt{m>3743:R,a<3740:nf,R}
+zqk{m<516:ft,m<883:bf,x<1639:R,R}
+vq{s<2233:A,s<2350:A,A}
+xb{m<903:R,R}
+lqh{x<2091:R,A}
+zr{a>3919:A,x>1276:A,x<690:A,R}
+in{m<1457:kf,szv}
+xg{m>2358:A,A}
+rb{x>1307:R,s>2733:R,hv}
+st{a<2850:A,vbf}
+tbm{a>3715:kcd,m>2410:rlm,stn}
+zjk{s<2242:hz,x<2870:gt,vtz}
+shc{a<2332:R,A}
+drb{a>3328:hfs,a<3240:jsr,ztx}
+tq{m>2044:A,s>1419:R,m>1835:tj,R}
+tvp{x<1506:hg,s<2159:lt,m<126:vvd,sz}
+dtb{a>2641:R,A}
+mbx{m>1293:fn,s<417:zn,rh}
+ln{m>136:R,m<83:A,m<110:A,R}
+gf{x>2871:cd,a>3436:blz,drb}
+hbm{x<756:qns,x<1386:R,m<3894:R,bt}
+jsr{m<3426:A,A}
+bmb{m>3851:R,A}
+nxg{x>1128:qcf,R}
+dnz{s>3099:A,R}
+qdk{x>1536:R,a<3185:R,xk}
+jz{m>573:js,s<809:A,x>1381:vt,pc}
+hgq{x>3568:A,A}
+db{m<34:A,s<1263:A,A}
+hts{a>3856:A,a<3741:A,A}
+lsl{m<587:xr,zpx}
+dv{a<1753:gdk,R}
+mh{x>365:R,m<2574:R,s>3648:R,R}
+cc{m<367:A,R}
+zpx{a<835:jp,a>1137:spn,zcq}
+hv{s<2493:A,s>2632:R,s<2564:A,R}
+lnz{s>1813:R,s>1793:A,R}
+xsg{x<1276:R,m<3419:jrb,A}
+qmk{x<446:R,m<3220:hkr,dnz}
+rr{a>3328:A,A}
+
+{x=555,m=85,a=257,s=1864}
+{x=561,m=159,a=473,s=524}
+{x=1,m=1419,a=1233,s=675}
+{x=1089,m=766,a=1101,s=2378}
+{x=1010,m=662,a=1172,s=2016}
+{x=2979,m=1043,a=169,s=1191}
+{x=100,m=379,a=1959,s=1262}
+{x=1782,m=2770,a=3430,s=344}
+{x=3185,m=1618,a=156,s=13}
+{x=834,m=666,a=1565,s=1106}
+{x=2134,m=2304,a=222,s=2574}
+{x=1138,m=953,a=296,s=1331}
+{x=973,m=84,a=1449,s=1053}
+{x=872,m=810,a=918,s=77}
+{x=1796,m=994,a=441,s=3453}
+{x=2566,m=1336,a=1625,s=72}
+{x=596,m=208,a=380,s=1858}
+{x=838,m=217,a=620,s=595}
+{x=404,m=238,a=2051,s=62}
+{x=1150,m=1729,a=227,s=1352}
+{x=652,m=255,a=257,s=115}
+{x=1,m=632,a=554,s=2230}
+{x=1116,m=1646,a=2196,s=691}
+{x=1498,m=59,a=503,s=546}
+{x=1471,m=3369,a=692,s=190}
+{x=1026,m=1795,a=593,s=549}
+{x=50,m=1170,a=2057,s=751}
+{x=74,m=562,a=926,s=348}
+{x=2649,m=597,a=117,s=1675}
+{x=651,m=1092,a=395,s=1332}
+{x=56,m=1418,a=866,s=1866}
+{x=232,m=1836,a=163,s=546}
+{x=699,m=472,a=423,s=2767}
+{x=150,m=2686,a=637,s=281}
+{x=99,m=1703,a=237,s=74}
+{x=136,m=3409,a=1103,s=1570}
+{x=1409,m=185,a=2260,s=610}
+{x=1637,m=2277,a=150,s=27}
+{x=515,m=1482,a=298,s=3343}
+{x=710,m=820,a=459,s=508}
+{x=1337,m=776,a=67,s=607}
+{x=1987,m=565,a=2309,s=1127}
+{x=724,m=243,a=330,s=863}
+{x=73,m=1092,a=790,s=523}
+{x=2645,m=3064,a=866,s=389}
+{x=895,m=2653,a=419,s=3558}
+{x=2098,m=518,a=1856,s=3256}
+{x=655,m=194,a=1988,s=1864}
+{x=1433,m=1887,a=1790,s=1238}
+{x=2053,m=535,a=337,s=958}
+{x=244,m=1087,a=2686,s=901}
+{x=1170,m=1684,a=411,s=1889}
+{x=726,m=1934,a=1618,s=443}
+{x=1332,m=1810,a=380,s=422}
+{x=649,m=1852,a=1,s=2544}
+{x=3146,m=437,a=2784,s=10}
+{x=596,m=491,a=2173,s=327}
+{x=88,m=207,a=48,s=444}
+{x=452,m=40,a=39,s=2294}
+{x=99,m=499,a=1671,s=101}
+{x=1220,m=1274,a=376,s=297}
+{x=2330,m=137,a=100,s=923}
+{x=1581,m=687,a=2567,s=317}
+{x=429,m=186,a=163,s=1936}
+{x=797,m=2500,a=1780,s=2179}
+{x=186,m=2375,a=2173,s=363}
+{x=320,m=48,a=1853,s=982}
+{x=1055,m=2256,a=41,s=914}
+{x=527,m=1721,a=119,s=2447}
+{x=75,m=126,a=1660,s=393}
+{x=18,m=1989,a=10,s=129}
+{x=1552,m=142,a=599,s=453}
+{x=735,m=1193,a=365,s=2696}
+{x=1489,m=6,a=932,s=92}
+{x=212,m=2273,a=145,s=1142}
+{x=1237,m=200,a=712,s=61}
+{x=117,m=1395,a=3696,s=3625}
+{x=1004,m=1531,a=1623,s=44}
+{x=935,m=1000,a=1599,s=261}
+{x=12,m=2868,a=43,s=803}
+{x=1335,m=1559,a=2373,s=334}
+{x=278,m=409,a=1180,s=948}
+{x=1190,m=804,a=267,s=53}
+{x=800,m=1523,a=866,s=286}
+{x=160,m=3245,a=1135,s=477}
+{x=1299,m=2492,a=970,s=105}
+{x=2643,m=928,a=56,s=1661}
+{x=214,m=2863,a=2692,s=348}
+{x=178,m=1747,a=916,s=126}
+{x=12,m=302,a=857,s=302}
+{x=433,m=120,a=1018,s=3452}
+{x=461,m=1048,a=196,s=1933}
+{x=665,m=594,a=2435,s=8}
+{x=1135,m=2290,a=259,s=741}
+{x=886,m=560,a=881,s=278}
+{x=1429,m=1225,a=245,s=269}
+{x=3164,m=346,a=1088,s=3245}
+{x=137,m=248,a=2201,s=451}
+{x=190,m=175,a=1798,s=86}
+{x=2769,m=2152,a=2079,s=960}
+{x=932,m=184,a=52,s=131}
+{x=815,m=2580,a=1474,s=3349}
+{x=1257,m=1833,a=974,s=16}
+{x=593,m=685,a=649,s=1583}
+{x=756,m=2884,a=602,s=438}
+{x=221,m=399,a=579,s=68}
+{x=1368,m=1064,a=110,s=144}
+{x=14,m=576,a=1284,s=1241}
+{x=2791,m=689,a=76,s=171}
+{x=281,m=216,a=264,s=635}
+{x=270,m=235,a=1566,s=226}
+{x=740,m=1145,a=111,s=415}
+{x=194,m=2410,a=272,s=176}
+{x=3068,m=259,a=164,s=222}
+{x=594,m=191,a=439,s=12}
+{x=26,m=256,a=278,s=1457}
+{x=276,m=489,a=1479,s=2972}
+{x=601,m=216,a=1040,s=1666}
+{x=765,m=1805,a=485,s=304}
+{x=1533,m=1953,a=658,s=10}
+{x=4,m=11,a=766,s=89}
+{x=483,m=1013,a=1281,s=1708}
+{x=2284,m=49,a=55,s=150}
+{x=558,m=254,a=20,s=22}
+{x=441,m=330,a=148,s=1761}
+{x=1956,m=422,a=2927,s=324}
+{x=387,m=1026,a=568,s=3575}
+{x=703,m=852,a=293,s=341}
+{x=2347,m=258,a=1681,s=3083}
+{x=142,m=451,a=450,s=228}
+{x=83,m=2112,a=1696,s=60}
+{x=2408,m=1812,a=228,s=815}
+{x=31,m=952,a=125,s=550}
+{x=55,m=2535,a=10,s=3172}
+{x=303,m=264,a=161,s=525}
+{x=140,m=979,a=548,s=2664}
+{x=107,m=1615,a=111,s=2000}
+{x=812,m=600,a=349,s=950}
+{x=1900,m=724,a=1278,s=1492}
+{x=370,m=1483,a=636,s=2186}
+{x=314,m=711,a=548,s=1023}
+{x=615,m=2745,a=1560,s=1901}
+{x=875,m=1076,a=1257,s=129}
+{x=1918,m=935,a=250,s=372}
+{x=2814,m=894,a=397,s=619}
+{x=1894,m=1200,a=1263,s=163}
+{x=361,m=2982,a=1094,s=552}
+{x=376,m=764,a=3825,s=1272}
+{x=197,m=6,a=431,s=2883}
+{x=916,m=258,a=1016,s=13}
+{x=1550,m=255,a=420,s=193}
+{x=2448,m=646,a=951,s=3294}
+{x=51,m=47,a=1154,s=1582}
+{x=780,m=1994,a=190,s=613}
+{x=2125,m=2036,a=419,s=370}
+{x=3530,m=653,a=112,s=2043}
+{x=830,m=1481,a=1151,s=826}
+{x=39,m=605,a=58,s=1708}
+{x=605,m=918,a=2267,s=77}
+{x=2308,m=436,a=753,s=820}
+{x=2078,m=2190,a=460,s=2282}
+{x=165,m=2188,a=460,s=416}
+{x=2343,m=2285,a=718,s=478}
+{x=139,m=578,a=867,s=3364}
+{x=212,m=26,a=1613,s=393}
+{x=134,m=318,a=237,s=1171}
+{x=23,m=233,a=85,s=876}
+{x=89,m=157,a=2290,s=1932}
+{x=96,m=377,a=49,s=1760}
+{x=1064,m=78,a=798,s=160}
+{x=1983,m=800,a=19,s=1766}
+{x=1157,m=1617,a=1270,s=425}
+{x=145,m=1754,a=517,s=915}
+{x=98,m=46,a=1762,s=1202}
+{x=13,m=359,a=3358,s=348}
+{x=1221,m=231,a=81,s=1975}
+{x=1523,m=385,a=1671,s=1234}
+{x=279,m=96,a=27,s=743}
+{x=1718,m=1694,a=886,s=1199}
+{x=1640,m=77,a=879,s=925}
+{x=239,m=73,a=2374,s=349}
+{x=1774,m=319,a=212,s=379}
+{x=2525,m=693,a=1126,s=1932}
+{x=1842,m=1318,a=714,s=2978}
+{x=286,m=1087,a=916,s=70}
+{x=61,m=205,a=15,s=2176}
+{x=804,m=1845,a=2665,s=664}
+{x=79,m=16,a=1376,s=2558}
+{x=1018,m=1624,a=1798,s=150}
+{x=2670,m=615,a=733,s=229}
+{x=1221,m=2070,a=238,s=201}
+{x=465,m=947,a=1251,s=1679}
+{x=1161,m=1334,a=57,s=1731}
+{x=239,m=388,a=42,s=2493}
+{x=1540,m=3200,a=849,s=89}
+{x=179,m=2098,a=724,s=144}
+{x=1605,m=636,a=3162,s=247}
+{x=1128,m=145,a=988,s=662}
+{x=1716,m=1127,a=1354,s=1470}
+{x=2411,m=92,a=482,s=1395}
diff --git a/23/elixir/inputs/day19_example.txt b/23/elixir/inputs/day19_example.txt
new file mode 100644
index 0000000..e5b5d64
--- /dev/null
+++ b/23/elixir/inputs/day19_example.txt
@@ -0,0 +1,17 @@
+px{a<2006:qkq,m>2090:A,rfg}
+pv{a>1716:R,A}
+lnx{m>1548:A,A}
+rfg{s<537:gd,x>2440:R,A}
+qs{s>3448:A,lnx}
+qkq{x<1416:A,crn}
+crn{x>2662:A,R}
+in{s<1351:px,qqz}
+qqz{s>2770:qs,m<1801:hdj,R}
+gd{a>3333:R,R}
+hdj{m>838:A,pv}
+
+{x=787,m=2655,a=1222,s=2876}
+{x=1679,m=44,a=2067,s=496}
+{x=2036,m=264,a=79,s=2244}
+{x=2461,m=1339,a=466,s=291}
+{x=2127,m=1623,a=2188,s=1013}
diff --git a/23/elixir/lib/days/day12.ex b/23/elixir/lib/days/day12.ex
new file mode 100644
index 0000000..35a649d
--- /dev/null
+++ b/23/elixir/lib/days/day12.ex
@@ -0,0 +1,103 @@
+defmodule AOC.Day12 do
+  use AOC.Day, day: 12, input: "example"
+  # use AOC.Day, day: 12
+
+  def parse_input(lines) do
+    Enum.map(lines, fn line ->
+      [conditions, groups] = String.split(line, " ")
+      conditions = String.to_charlist(conditions)
+
+      groups =
+        groups
+        |> String.split(",")
+        |> Enum.map(&String.to_integer/1)
+
+      {conditions, groups}
+    end)
+  end
+
+  def possible_unknown_spring_conditions(unknown_spring_count) when unknown_spring_count == 0,
+    do: [[]]
+
+  def possible_unknown_spring_conditions(unknown_spring_count) do
+    next_list = possible_unknown_spring_conditions(unknown_spring_count - 1)
+    Enum.map(next_list, &[true | &1]) ++ Enum.map(next_list, &[false | &1])
+  end
+
+  def apply_spring_configuration([], []), do: []
+
+  def apply_spring_configuration([?. | conditions], spring_configuration) do
+    [?. | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def apply_spring_configuration([?# | conditions], spring_configuration) do
+    [?# | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def apply_spring_configuration([?? | conditions], [true | spring_configuration]) do
+    [?. | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def apply_spring_configuration([?? | conditions], [false | spring_configuration]) do
+    [?# | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def valid_spring_conditions?(conditions, []) do
+    not Enum.member?(conditions, ?#)
+  end
+
+  def valid_spring_conditions?([?. | conditions], groups) do
+    valid_spring_conditions?(conditions, groups)
+  end
+
+  def valid_spring_conditions?(conditions, [count | groups]) do
+    {left, right} = Enum.split(conditions, count)
+
+    length(left) == count and Enum.all?(left, &(&1 == ?#)) and
+      (length(right) == 0 or hd(right) == ?.) and valid_spring_conditions?(right, groups)
+  end
+
+  def generate_arrangements(conditions, groups) do
+    unknown_spring_count = Enum.count(conditions, &(&1 == ??))
+
+    possible_unknown_spring_conditions(unknown_spring_count)
+    |> Stream.map(fn spring_configuration ->
+      apply_spring_configuration(conditions, spring_configuration)
+    end)
+    |> Stream.filter(fn possible_conditions ->
+      valid_spring_conditions?(possible_conditions, groups)
+    end)
+
+    # |> Enum.to_list()
+  end
+
+  def calculate_arrangement_counts(input, duplicates \\ 1) do
+    input
+    |> Enum.map(fn {conditions, groups} ->
+      conditions =
+        conditions
+        |> List.duplicate(duplicates)
+        |> Enum.intersperse(~c"?")
+        |> List.flatten()
+
+      groups =
+        groups
+        |> List.duplicate(duplicates)
+        |> List.flatten()
+
+      generate_arrangements(conditions, groups)
+    end)
+    |> Enum.map(&Enum.count/1)
+    |> Enum.sum()
+  end
+
+  def part1(input) do
+    calculate_arrangement_counts(input)
+  end
+
+  def part2(input) do
+    calculate_arrangement_counts(input, 5)
+  end
+end
+
+# NOTE TO SELF: memoize the brute force...
diff --git a/23/elixir/lib/days/day18.ex b/23/elixir/lib/days/day18.ex
new file mode 100644
index 0000000..aeac05b
--- /dev/null
+++ b/23/elixir/lib/days/day18.ex
@@ -0,0 +1,109 @@
+defmodule AOC.Day18 do
+  use AOC.Day, day: 18
+
+  def parse_input(lines) do
+    Enum.map(lines, fn line ->
+      %{"direction" => direction, "length" => length, "color" => color} =
+        Regex.named_captures(
+          ~r/^(?<direction>[UDLR]) (?<length>\d+) \(\#(?<color>[[:alnum:]]+)\)$/,
+          line
+        )
+
+      {String.to_atom(direction), String.to_integer(length), color}
+    end)
+  end
+
+  def dig_stretch({y, x}, direction, length) do
+    Enum.map(1..length, fn n ->
+      case direction do
+        :U -> {y - n, x}
+        :R -> {y, x + n}
+        :D -> {y + n, x}
+        :L -> {y, x - n}
+      end
+    end)
+  end
+
+  def execute_dig_plan(dig_plan) do
+    Enum.reduce(dig_plan, {%{{0, 0} => true}, {0, 0}}, fn {direction, length, _color},
+                                                          {terrain, position} ->
+      stretch = dig_stretch(position, direction, length)
+
+      terrain =
+        Enum.reduce(stretch, terrain, fn new_position, acc ->
+          Map.put(acc, new_position, true)
+        end)
+
+      new_position = stretch |> Enum.reverse() |> hd()
+
+      {terrain, new_position}
+    end)
+  end
+
+  def print_terrain(terrain) do
+    max_y = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 0)) |> Enum.max()
+    max_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.max()
+    min_y = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 0)) |> Enum.min()
+    min_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.min()
+
+    Enum.each(min_y..max_y, fn y ->
+      Enum.map(min_x..max_x, fn x ->
+        case Map.fetch(terrain, {y, x}) do
+          :error -> "."
+          _ -> "#"
+        end
+      end)
+      |> Enum.join()
+      |> IO.puts()
+    end)
+  end
+
+  def find_interior_space(terrain) do
+    max_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.max()
+    min_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.min()
+
+    edge_x =
+      Enum.find(min_x..max_x, fn x ->
+        case Map.fetch(terrain, {2, x}) do
+          :error -> false
+          _ -> true
+        end
+      end)
+
+    edge_x + 1
+  end
+
+  def flood_fill_terrain(terrain) do
+    interior_x = find_interior_space(terrain)
+
+    flood_fill_terrain(terrain, {1, interior_x})
+  end
+
+  def flood_fill_terrain(terrain, {y, x}) do
+    [{y - 1, x}, {y, x + 1}, {y + 1, x}, {y, x - 1}]
+    |> Enum.reduce(terrain, fn next_position, acc ->
+      case Map.fetch(acc, next_position) do
+        :error ->
+          acc
+          |> Map.put(next_position, true)
+          |> flood_fill_terrain(next_position)
+
+        _ ->
+          acc
+      end
+    end)
+  end
+
+  def part1(dig_plan) do
+    execute_dig_plan(dig_plan)
+    |> elem(0)
+    # |> tap(&print_terrain/1)
+    |> flood_fill_terrain()
+    # |> tap(&print_terrain/1)
+    |> Enum.count()
+  end
+
+  def part2(_input) do
+    "TODO"
+  end
+end
diff --git a/23/elixir/lib/days/day19.ex b/23/elixir/lib/days/day19.ex
new file mode 100644
index 0000000..cbb6a08
--- /dev/null
+++ b/23/elixir/lib/days/day19.ex
@@ -0,0 +1,103 @@
+defmodule AOC.Day19 do
+  # use AOC.Day, day: 19, input: "example"
+  use AOC.Day, day: 19
+
+  def string_to_action("R"), do: :reject
+  def string_to_action("A"), do: :accept
+  def string_to_action(workflow), do: {:workflow, workflow}
+
+  def parse_input(lines) do
+    [workflows, _, ratings] = Enum.chunk_by(lines, &(&1 == ""))
+
+    workflows =
+      Enum.map(workflows, fn line ->
+        %{"name" => name, "rules" => rules} =
+          Regex.named_captures(~r/^(?<name>[[:alpha:]]+)\{(?<rules>.*)\}$/, line)
+
+        rules =
+          rules
+          |> String.split(",")
+          |> Enum.map(fn rule ->
+            if String.contains?(rule, ":") do
+              {property, rest} = String.split_at(rule, 1)
+              {operation, rest} = String.split_at(rest, 1)
+              [count, action] = String.split(rest, ":")
+
+              action = string_to_action(action)
+              count = String.to_integer(count)
+
+              operation =
+                case operation do
+                  "<" -> &Kernel.</2
+                  ">" -> &Kernel.>/2
+                end
+
+              fn part ->
+                value = Map.fetch!(part, property)
+
+                if operation.(value, count) do
+                  action
+                else
+                  :continue
+                end
+              end
+            else
+              action = string_to_action(rule)
+              fn _ -> action end
+            end
+          end)
+
+        {name, rules}
+      end)
+      |> Enum.into(%{})
+
+    ratings =
+      Enum.map(ratings, fn line ->
+        line
+        |> String.trim_leading("{")
+        |> String.trim_trailing("}")
+        |> String.split(",")
+        |> Enum.map(fn property ->
+          [name, value] = String.split(property, "=")
+          {name, String.to_integer(value)}
+        end)
+        |> Enum.into(%{})
+      end)
+
+    {workflows, ratings}
+  end
+
+  def perform_workflow([rule | tl], rating) do
+    case rule.(rating) do
+      :continue -> perform_workflow(tl, rating)
+      action -> action
+    end
+  end
+
+  def sort_rating(workflows, rating, current_workflow_name) do
+    workflow = Map.fetch!(workflows, current_workflow_name)
+
+    case perform_workflow(workflow, rating) do
+      {:workflow, next_workflow_name} ->
+        sort_rating(workflows, rating, next_workflow_name)
+
+      action ->
+        action
+    end
+  end
+
+  def part1({workflows, ratings}) do
+    Enum.filter(ratings, fn rating ->
+      sort_rating(workflows, rating, "in") == :accept
+    end)
+    |> Enum.map(fn x ->
+      Enum.map(x, &elem(&1, 1))
+      |> Enum.sum()
+    end)
+    |> Enum.sum()
+  end
+
+  def part2(_input) do
+    "TOD"
+  end
+end