Day 21 (part1)

3 files changed, 2832 insertions, 0 deletions

diff --git a/day21/example.txt b/day21/example.txt
new file mode 100644
index 0000000..e14be60
--- /dev/null
+++ b/day21/example.txt
@@ -0,0 +1,15 @@
+root: pppw + sjmn
+dbpl: 5
+cczh: sllz + lgvd
+zczc: 2
+ptdq: humn - dvpt
+dvpt: 3
+lfqf: 4
+humn: 5
+ljgn: 2
+sjmn: drzm * dbpl
+sllz: 4
+pppw: cczh / lfqf
+lgvd: ljgn * ptdq
+drzm: hmdt - zczc
+hmdt: 32
diff --git a/day21/input.txt b/day21/input.txt
new file mode 100644
index 0000000..7492d2b
--- /dev/null
+++ b/day21/input.txt
@@ -0,0 +1,2751 @@
+fchg: 5
+fvhd: 4
+hjpd: ntvg * ntpl
+jhph: 7
+fjlh: 4
+tqsb: 2
+slwq: zjzs + zctz
+cqfs: 3
+qtlm: 4
+sdsb: 2
+lfcq: 2
+nlvv: 5
+zgcl: wqgd * zfbp
+tqvl: 4
+qvds: wcmp * nsvf
+npcg: 3
+wlqd: 2
+nslf: 4
+vfsl: wfdf + qpts
+tjft: wltb + jhdm
+dhmp: rrwd * shpj
+tbtc: 3
+lgdv: 9
+ftsd: vgqq + qsfp
+ldfn: 5
+tvbh: 4
+jvht: jpqn * mlcb
+jdvr: vlgs * nzwm
+pjbm: 5
+rzcl: chdb * tbfz
+ltdt: fzgw + grlf
+rwbt: zzpr * tlzs
+bfrd: 14
+dfwg: dpqr * tgff
+wqwm: 3
+vbmh: vtln * jbbw
+rppb: gfgz * sjmz
+dmrz: tjft / jtnw
+wsjc: dwvm + bjsd
+msqm: vpnm * jzzh
+dwdv: 5
+njsc: wngz * hdrg
+fbzr: 14
+wqdp: 5
+dpzc: wsqn * zsrr
+jgwr: 7
+wfcz: mqrf - hbrq
+rgfr: 3
+fpgs: 2
+tbfz: zfvz * fngz
+mfbv: ltfv * mlzd
+fmvh: cnmh + cljv
+swft: bnlp * pdgl
+mrnp: bldf + zhtv
+wpms: rjnl + hnps
+pzzm: dpls / cvgg
+wpsf: 18
+phtj: gbjw + wfmc
+sptt: 12
+wcjj: 2
+hgmj: sstv + qzhb
+fpnf: qmrq + bfcq
+prwp: mdhb - nlfw
+hzzf: jfpn + lvcm
+jrrg: 5
+rbwf: qqvm / sjsp
+bpgt: 3
+wngz: 4
+sdjd: 3
+hnbf: hddn / sghh
+cvzn: 2
+tnlj: lbgm + ghsw
+jcqf: 2
+shpj: lggg + wbcn
+mwgp: 11
+wrwt: cghm / nzgd
+wpsm: 16
+rprv: 5
+nmcj: whhl * hjtv
+jlnn: tdjl + lmmw
+mlfr: 3
+fjds: hblb + swft
+bqns: qjng + rppb
+tsrw: 3
+gdhf: 3
+gbsb: 5
+qpgq: tgdl * vlzn
+wdhn: 2
+qfqv: 3
+vvdb: 3
+cfhv: 2
+nqzd: bllq * jpgb
+bjpv: tcrp * fhdl
+thdm: 7
+dthc: sdgf + ltfn
+gndh: swtp * lfts
+svjb: 12
+dsqp: 4
+fwhd: 3
+ctlr: mljd + dhzm
+fhmr: 3
+frrd: nvpf * bgjp
+mlcb: 4
+gbjs: 2
+gmcs: 2
+jfpt: 5
+nzbc: 5
+rglv: scmj + lcbh
+cjqh: 5
+czdp: ndfm * szdh
+jllb: 2
+fcfv: rrtv * cgqj
+mvmw: 4
+rsrz: sdjz + llcg
+rcrh: bcfp * rtjd
+dfsw: 1
+qmfh: fzrv + vgqs
+tssz: 4
+wphf: cvtc + hnfl
+mztw: 2
+bjwz: 5
+dsmr: 4
+mtqq: rhtv + sqfb
+mbjm: phmb + snzb
+nzds: vgdr + gnwt
+jdrn: 9
+wnsj: 2
+zgqn: 2
+tjnv: qbcg / csfn
+fhcv: dctp * bhpw
+pvgt: cnlj * rvww
+fqlw: 5
+tpbf: 4
+crvv: ngsv - cwbn
+pwtv: 7
+mpss: 3
+dbwp: rjst * tgnh
+wzzd: lmvz * bfqg
+qsnc: 14
+mfjq: 5
+nbcq: 4
+rfvv: 3
+vpnm: 5
+dgwm: 5
+btdd: 2
+cbcl: vlts + mzcw
+fjmd: nsqr * vfhr
+njjw: vvzt * qgft
+nmcr: fddz * wtzc
+ggfr: 2
+mczh: 4
+zfbf: 10
+dclg: 5
+bzgj: 3
+fggm: szjv + jmsw
+bvww: 16
+stvz: 7
+szmh: 19
+lclv: tpbc * zzsz
+gwrh: jrrg + pvlp
+mdhm: dthc * dwpr
+svbj: 5
+nzwm: 3
+zfdg: ntgl * rgrw
+wvwd: zhrt - tgfs
+bqjt: 3
+cqrh: 5
+mwwt: cwgg * vmfd
+bjdn: 2
+bpwz: vtzr - cvrf
+jgpt: 2
+czfc: ntgv * bpgt
+tdfb: hzgf * hpwz
+lmzz: 3
+vpcf: 1
+ntwf: 7
+dqcp: 2
+jhts: 11
+zrpn: lnpz * mllb
+hdtp: cjbf * mmml
+dlmt: cpcn * jzwp
+qhsq: 4
+hcpr: 3
+rzfl: gchw * llrz
+gzcn: ncmp * snfr
+hrzh: 2
+dfzf: 16
+gmzb: 2
+njcg: pzmn * vqqh
+znwp: 4
+nfzb: 3
+dpjv: qfmh * gqsd
+rvww: wpsf - rhrq
+tqpv: 4
+prbf: jgsz * cqzs
+jttq: 10
+zbsm: mhtn - bgbh
+wpwr: 5
+bnrz: gjdc + fqlw
+bvzj: 3
+lmjh: tcnv + prhw
+lrjm: 4
+ldqv: frgr + lqcb
+qqwr: jdvr + tgwc
+bmqp: 4
+tzlp: tsrt * cwgp
+grnp: 2
+czwg: 2
+pbcv: 3
+mrbz: wqjf * fczv
+wrlb: 5
+cmdr: mmsh * npwz
+mbdd: hpqc * vbww
+jvfj: svvl + twch
+mhjg: llff + bsnt
+rgrv: 5
+pzbv: 2
+njgp: bzgj * rnqg
+cjvp: 2
+fgdv: qzbg * wszh
+npcf: dclt * llzt
+nzqw: 4
+gsjq: 5
+tvzz: cvnw * hvtg
+bglm: 3
+dcrc: rsdd * phft
+cssf: zvhs + bhcp
+bfln: 5
+hjmh: 5
+rjls: 4
+tzrp: 5
+trgm: dvtc - zhss
+ghhj: jhtc * wrfq
+bbll: 3
+nzpt: ltdt + dbnv
+slft: mmcn * fcwt
+pnhc: 3
+mpgt: mwqt + vlnh
+wqjf: 3
+nwfq: 3
+vpqz: 11
+gvlz: 3
+hrlt: 3
+psph: jbpv + thds
+hbqq: 16
+bqbt: 2
+qdwv: trfc + cswj
+qzsj: 19
+gwnz: 3
+vnvl: 5
+tjrj: qpmc - hgjr
+wvqf: 3
+brws: 3
+bsrr: 11
+grst: 20
+lvpf: gzsf + bvsm
+lzcn: 2
+fhvw: humn - jchs
+jbmf: ggpd * bljw
+gwwf: 3
+pwpn: 2
+ftnw: szbv + sdws
+lcvf: bdbh - rnft
+mqqr: fbmb * jjqs
+nqgd: jflp - rmmb
+rssw: 4
+dcjs: wnjm * rssw
+rscg: fdhj * zcvc
+lsvp: trhb * znvd
+bqlh: jwvq * nhrq
+rltm: 4
+hcsb: 9
+mvgc: 2
+wrnn: rthw + jwnt
+bprw: 3
+jzvl: 4
+fvct: 2
+hrdp: lvpz * lfgv
+chdb: hwbf * mmbt
+blwr: 3
+jvlz: 7
+cjnw: gngd * fwmw
+sqcr: scvq * dmzl
+nbqm: pjnl - zgmg
+sgpw: qmwq * bfnt
+jjtn: ldjm + nvld
+pznw: 4
+dpzm: zwqv - ffqb
+mlbf: jhrz * mcqq
+bjzb: 2
+nlps: 15
+phwz: mcmg - rfrr
+mgsd: 4
+bcbd: brqw / dwhp
+shhc: hrbm / sfdp
+lmlr: 2
+lpmh: 4
+rswb: mpgt + dsvv
+chbm: pwpn * djsq
+gpwj: bltz + trvb
+phmp: slbb * dqnm
+scwl: fwpr + ntdl
+gmbj: 5
+gmgn: ftnw * bcmt
+vrcs: 1
+rbgm: jttt + zdpn
+pmtw: 3
+npvz: ltmq - zqgd
+lddb: 10
+dfnc: dcjm + dwwv
+fftm: 5
+lchj: 9
+qwwh: 6
+lngv: pmbl * wgdc
+wnsd: jfgq * pvnc
+cqzf: 1
+wcmp: 2
+fczv: whjf * ffwp
+vpvb: hlzb * bnvt
+lvls: 5
+lmfw: dlnf / ddtn
+pdtj: 2
+hnmp: 2
+dhhw: flwn + jsmh
+ngmh: 2
+dzff: 7
+wlzs: zzng * cvrt
+pgwj: 1
+mcqn: glht * cfhv
+qptt: 2
+jrhp: jlpm + tcwm
+dmmr: bzlt * jjpv
+rwpg: 13
+qhgh: mdzr * zbcs
+pqwr: phqq - ctdq
+sjbt: 5
+mtbg: 12
+vbrc: fhmr + rmvl
+nrww: 3
+dlfj: hhsz + cpzc
+jtcj: 8
+whpl: 5
+bltw: cssf - plrv
+ffdn: rnjh - zmmp
+bmhn: 2
+bqtb: qhlp * dnrn
+dsgj: 2
+dwsp: 3
+njnq: 9
+jpqn: 2
+vflt: zpcw + dcjp
+cvqw: ztdq * rgrv
+tcrp: psnc / lhfg
+pqwf: 3
+jllq: 5
+hppd: rswb * pfnd
+mrtl: 16
+pvlp: 3
+dwpr: 11
+fpvb: 2
+bjrj: mcqn + jzgp
+hdsp: ttdt * mczm
+hrsn: 3
+dmqv: 2
+zbfv: lnbr * zfdw
+vwdj: drfv * ncjd
+rjst: mzcf + zldn
+bdsp: qclb + qrjr
+pmqr: 1
+lpjz: brhh - zdjv
+dfpv: llhn * wpzc
+pwjn: nmvg + szrd
+qsll: 4
+jsbw: 5
+wgdr: rpmz + qbdz
+clgl: fjss / gbjs
+wrfr: pzpz * lfwp
+pnvj: qrjc / zlpf
+btmp: lbdb * fzwh
+dbmd: 11
+wszs: nnjm * lcdn
+lbgm: vnpf * wzlh
+mvgt: rsrz * sbzp
+wlnf: 9
+tfvm: drvf * cmrg
+rmbn: cbnq + crwn
+gszb: vqpf + brbg
+tcbw: 3
+hsvl: 1
+mtbv: gbhm + hlfl
+gwld: gmqt / mdgn
+wzww: dwhq + hfch
+zldn: zlbm * mwls
+jcjj: 3
+zzzc: 2
+gdvz: 13
+zzpg: 3
+mlrp: 2
+mqng: 2
+nntf: 5
+cqbr: 5
+nhrt: 3
+zgdg: 3
+qrjc: tvbh * ngng
+cbcf: 6
+hrtp: 6
+nssj: gslf * tcsl
+llff: 7
+dlgh: 13
+lswr: lmrl * nvwj
+gqws: 2
+ncjd: frsc * jcng
+bgzs: 6
+tgwc: fcjj / mlrp
+wwsc: 4
+whgn: hgbb * qpsr
+qhvs: tsrw * vmqz
+fbdg: jlgj * mlfr
+qdbt: 2
+cmbw: ggsl + dlfg
+qwwg: bnlg * gbtv
+nvwj: 5
+brwm: tqhm - pvpm
+dtfj: zsfr - hdjh
+snfr: 2
+pmfs: 2
+bljw: 2
+mczm: 3
+bhmj: jcpz * dqfd
+fswn: qcvv - fbsb
+ptff: dbjl * bvvd
+cwch: hgjq * wfhm
+ggvb: wgrl + cqzf
+prgh: qggf * nwsv
+tmqv: bhjq + hsvn
+wldt: 2
+hfsw: fzvw / dgzg
+ttwd: 2
+ctzw: 13
+rwss: hcjw / rvpf
+cgdd: jhts + zbfv
+sghh: 2
+mhws: srft * lhmq
+qfcf: pzzm - jtrs
+pdsj: mvjf * hshp
+bhcp: rnwm + bsfr
+vsvb: 9
+lsbc: rtmg + gtjw
+lmrn: 17
+vlnh: lltb * ggfr
+cgrs: 1
+trwt: 5
+vbww: 3
+bzps: bqbm * fpvt
+dddb: 3
+qsnq: rzbs + dhmp
+nzgd: 2
+tnbj: 10
+rtlf: wpnd * hpdb
+mdhq: 4
+qnzf: gbjm * slrq
+lfnn: jsfv * flwj
+dmtr: wfft * gwmn
+mmcn: 3
+rqwt: tmvt * drml
+rvbv: 2
+zrnf: 3
+gszl: 2
+lnwp: 2
+ldlt: prgr * tpzc
+rdsv: rjls + lwbb
+sstv: cdtv * qmdj
+lhrp: sdzn + lwsp
+tcwm: tqsb * pbsd
+rrtr: njcm * nnzg
+zrjq: nznr / bccw
+wfps: 8
+hpwz: jcpq * ttrs
+qmwq: 3
+qgft: 2
+fmjl: 5
+jcfg: 17
+bngt: 7
+wzgz: 9
+pdqp: 3
+mncm: 19
+fzzp: qjqr * spnd
+mcmj: vqrw + ccpr
+jdfz: 2
+nhjs: mjdq + mdhq
+bpwh: 1
+fzgw: nrrr * ngmh
+hqsf: svbj * pjch
+rflz: 4
+zhrt: wlzs + qvhf
+glqg: 9
+qdhg: 1
+whqf: jdlj * mwmv
+dhwc: lsbc + brcv
+psws: nzzh + nfwb
+rswg: rtnc + zgcl
+trfr: 2
+dnzt: bqgb * hbtf
+nhgc: nvfr * fcnl
+jmdf: 5
+psnc: vflt * jcsc
+mlhj: pwtv * nhrt
+tsrt: 4
+ltdw: 5
+sjsp: 3
+mwls: 7
+hmnm: 10
+gjcw: 3
+fwpr: pswr + bcbg
+lhcm: vzrs * jbqj
+llhn: 3
+hwnm: tlgw + qdwv
+rchm: 2
+sttd: 3
+dhgd: pzwm + bzhc
+lcfj: 17
+bcdt: btbc / rzgq
+vnhf: bgql + nzqz
+fhnr: 4
+jtlf: jbjl * vncg
+qnqz: jglm * bjvw
+dctp: 2
+jnbv: hshd + nscv
+qnst: 2
+vsdt: qpdh * dmqq
+lffg: thtq / tsbm
+stsz: 14
+qfhf: 3
+njcm: lmfw + mlgg
+pfsq: 2
+ppcf: qjfj + bnrb
+pgmj: gvnz + zmqr
+nwsv: 5
+qhgc: 5
+jltt: fgdv + zbhp
+vplr: tpbf * ffbj
+brdn: chfb + hcsb
+rjrf: 4
+mlzd: 2
+hmgn: djbw * hzwp
+rhrq: 4
+btbc: hfsw - stdj
+lwnq: 11
+jsfv: 4
+fpvt: grmh * jgsv
+dmqq: 3
+trms: nvsf + qfst
+bhpw: mssb / wgvh
+lmdn: 2
+ggvl: mrtl + jgtq
+pqvv: lflw * mtqq
+jmsw: 3
+lnhh: zbjp + btqs
+sfdp: 2
+qhjl: 3
+dpqg: 2
+qrff: 2
+gsch: 4
+nvhd: jjtn * gmcs
+dzdq: 4
+tzvw: 8
+lvmh: bdfs * wbqz
+jtmt: hqrm / lmdn
+gjfh: ffgz / nqsv
+cpzp: qncm + wdwf
+nzzw: 3
+pwdf: 7
+wjrt: 2
+ffdf: mqqr / zpzp
+dsrz: 2
+ddjn: 5
+cljj: nljj + gzch
+hcwd: gtqp - jlwb
+scfs: qsnq - pblr
+pgbh: mznv + sldh
+rpmz: tght + dlfz
+qpzb: vnrf * mfnp
+vqdd: 7
+jmnz: lpzl * fpgs
+stfm: 4
+mjdq: hpzw / twrn
+gdww: bfsb / cjqh
+fdvd: 2
+rscn: 11
+bsdh: fbfg * mfbv
+zphm: psnv * tsvc
+ttds: vhpg * pmhs
+cvtc: 1
+sptq: 4
+jchv: 8
+jwnv: 3
+tfdh: 2
+ndph: slcv + rrvj
+jtwc: cngl * fdvd
+nggs: 6
+cmrg: vpvz * ppvh
+gtqp: qjqd / lvls
+tflh: 4
+tshp: cnlh + hsvl
+slht: 5
+lnpw: 2
+mzdb: jqng + ghlb
+jzlh: 2
+zqzw: vnrz * cqpj
+nsqr: 4
+nwvw: 3
+htqz: 8
+vlzn: zssf + tnnc
+fcwt: vhmn / cqtt
+tjlv: 3
+jszs: zztq * mgjb
+bmvb: hrbj * cmdr
+vlgs: tvzh * zjvw
+tgtg: thnc / cdgd
+ghsw: bdzl * qdmt
+cwgg: gmbs + mchq
+cvnw: 12
+zhgz: 2
+rtmg: 2
+tlzs: 2
+srqs: 5
+wnwq: jbnf - zwrn
+nlnw: hzhf + ztvc
+drvf: 13
+mfnz: 5
+lqtm: trqf + mlhj
+dhnp: 2
+dtrf: gwws * jhnh
+ggml: rmbm + tjdp
+mggf: 3
+zfdd: 2
+npwz: 3
+zlbm: 9
+dzcg: 2
+hshp: 3
+cntz: dclg * jvht
+mrgs: dmcl - zmql
+slpm: tqlz + jfpz
+ggmm: 3
+mcqq: 7
+nnfb: gflj * smfn
+dhzm: hbjt + rmbr
+pzdl: 2
+zcvv: szfd + msqm
+trhb: 2
+rdvh: 7
+pwpl: 2
+qddq: 5
+vpgp: 5
+vssc: zwqj * cmbv
+dmhj: flqq - cwvp
+gbsr: 2
+jzrg: 10
+vgwn: 2
+hqft: 10
+cqzs: 5
+sbzd: 4
+btdt: phtj - ndlf
+flmc: wwss + zdvp
+svfr: qzwt + nhgz
+jhnh: htfq * qbzh
+bfvq: 3
+zrzv: lnnq + gnjv
+wbvm: 2
+tqzf: 3
+nvvv: dgbn * spcb
+sqjf: 3
+dmhb: 2
+vvlw: 3
+wmcv: mdqz * ctmt
+hbgd: hspj * sbcs
+vpss: zrfv + nvtd
+zztq: 3
+wnlr: ddlb + qpgq
+vlfp: 2
+plqr: vhjz + cbcl
+mjdp: ljpr * nbcq
+scjv: hdrp * cmnq
+jgtq: hgbw * hmgn
+vzlt: gcjm + jjch
+twpl: jtmh + pgwj
+jfmw: 3
+jcpq: hjmh + wwhp
+fqss: jgpt * sgrn
+dbfb: nhwd * tzzw
+lrtt: 7
+whjf: vbmh + pqwf
+lmrz: 2
+bcbg: bbll * nbsm
+twbn: 19
+chmd: 3
+vtdt: 5
+jhrz: 11
+tvzh: 3
+vbqt: 2
+fwqc: czfc - rrzv
+ltmj: 5
+hdfz: dhtf / fjmd
+glfw: 3
+wsjt: hcwd * bbdf
+jrpm: 4
+vgmt: lfbg + wfps
+nwjp: lfbm / fbgq
+qlrc: 2
+bhcl: 3
+qmsm: mrbz / nlwl
+nhvw: 5
+ndfm: lhlp * bhcl
+lgrv: lzfz + tlsq
+bvwd: 2
+gtgv: snvw / jtmt
+ttrs: 2
+pgpb: bhmj * nssh
+qrnh: bmvj + zhth
+prhw: lpbs * dqbq
+jmqd: 4
+rqjg: 3
+hvdj: vwqb + qgnt
+bnlg: 3
+pmpl: 2
+cwqv: 14
+gzwc: 3
+tnbb: 2
+jdlt: hzpm / lnwp
+sfqj: 4
+bzdc: qsjj * rfwp
+vmnl: qbrf / mpdd
+mdmd: 2
+bbhm: 7
+vsmd: btmp * hgmr
+hccl: gdzl / trfr
+pvtr: 9
+dmwb: slwq + qbqs
+qqhs: hqft + gdvz
+dtpc: rgrf + rftg
+bdwd: 13
+grlf: qcrv * bbhq
+pzlw: 5
+hjqb: 2
+bgvq: hwtj + ltzc
+vrzd: 4
+zqmf: qfzj - msnn
+mgtt: bbhm * fpvb
+tbzr: 3
+ndhs: tnlj + hdvz
+qzfj: 4
+vtmn: tqmb * bbvl
+znnf: rvbv * rscn
+lncs: qzsj - ngjc
+ntgl: 5
+jpsg: 7
+cjbf: fzwg + rsqm
+djfz: vjlz + hhtb
+ztdq: 5
+qpdh: 3
+qmrq: 2
+qzwt: 3
+cwvj: 17
+cmnh: 3
+dzqj: 6
+bdfs: tghr + mwhf
+lndz: 7
+lbpg: 4
+vcgb: glnl * blwr
+hrwm: 2
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+mfjw: qfqv + bssg
+rjdm: 4
+gzhn: 2
+lbqw: 3
+cmwv: 2
+bvsm: mflh * rqps
+tnbr: 5
+srft: 6
+zwff: hltd + hjqb
+twwv: 5
+nnsj: trcj + qnrq
+mvmf: 2
+trnd: 4
+pfwc: bnfv / lzcn
+zdpn: 5
+ndsm: lttm * dhvn
+zthj: 2
+rjnl: 11
+ldjm: twpl + wpms
+hjtv: 5
+gzvn: stsz / vlss
+zzzb: rmbn + thjf
+wsbm: 2
+zfhs: npjg * ztfw
+lfbm: dpqg * gtgv
+gjzp: lvvt * hgmj
+htgl: tgsc - lndq
+wbqz: 2
+msfn: 19
+cdgd: cvzn + tcvr
+stdj: wsbm * gqcz
+zdzj: 16
+vfmq: 7
+spcb: rdtg + gwrh
+wwcs: 4
+lrfr: dmwb + vdgc
+bjzd: 2
+nvld: ttqn * bnwn
+rvmz: svjb - qbzf
+wtdg: phwz + bhfb
+cwgp: 2
+gcrr: 16
+pfwp: fzld + sdfb
+tzwj: 2
+fbgq: 2
+zqzn: dmtr + cnsr
+bmjj: mhjg * grjb
+bbhq: bvzj * zfrq
+mlsc: 2
+vvcp: wnwq + jpjv
+dhjp: 3
+qfzj: lcvf * rjwg
+ztqz: hvjb * ttfw
+sbht: 3
+dbvm: gpdv + sgpw
+tqqh: 5
+srdc: 4
+bvms: dzfr * wtnn
+thzg: 3
+zntq: dzff * mvgt
+dnrn: 2
+smmq: gbzp * gtrr
+wgss: jqtt + lvpf
+rcnm: jwtg + htps
+njrm: lffg * srwc
+gmwl: 2
+gpmz: 3
+tsbp: 3
+mdbr: 2
+sdpp: 4
+rgnr: vrgh * mflt
+hdvz: pzbv * bdvg
+hzmw: bqjn * ptrb
+pjch: 5
+clqj: lsdg * mmcc
+ljhg: njnq + fgbl
+zlbt: 15
+nmgp: 8
+wwmm: 2
+hwqf: fhnr * gwqq
+scts: 5
+czzj: rwbt + nhvw
+dcbm: vrcg + pbqq
+cmql: 17
+lhpr: 2
+qqmc: jwnv + qvpv
+fmzc: dtbc + whgn
+lrrd: rmwh * jzww
+jbbw: 5
+drpc: 4
+hspj: nnmv + nlwf
+ngjc: 2
+hvgq: hqcs * hwpq
+rrwd: cfgq * vbhn
+phft: htdz + rflz
+dhfc: bnrz + pqgz
+nbrt: ldfn + pfsq
+tzds: 17
+wlcc: 3
+hgnl: 7
+swnb: 3
+mnbd: 16
+scvq: 2
+crrl: clgl + qddq
+zmql: 1
+nldh: 5
+cpcn: czbc + thpf
+tzzw: bnhm + bwlh
+jqcj: 15
+hgdl: 4
+jjjt: 2
+whcj: mggf * rgjs
+jvnj: prpb + hpdp
+bbdh: vcrq + wwpw
+rgjs: dmcn + rtzl
+hjfc: lzvh - rlmt
+lssr: fqrv * wqwm
+qzvh: pbpf * wshh
+qvcr: 5
+zqsw: wzrg + trmz
+llzt: 2
+zfcr: 6
+qgbs: vwdj - frjt
+flrq: whcf / zdnj
+sbrn: 2
+bfbn: 4
+lfts: 2
+mzwb: 3
+htps: wwcs + gbnr
+hqvs: njqv * fqmn
+sljl: fhfg * vgwn
+cvhj: qmsm * njcg
+fwqh: vtgm * gbcl
+sbvj: 3
+rlqt: jtqr + gqqr
+ldwp: 9
+mzvs: dsmr + gqgg
+hlwh: 2
+fbsb: bwgm + qhhr
+tzzv: vtsh * mvgc
+nzhs: dddb * thzg
+fcjj: prtl * mnfq
+plvg: 14
+qdph: hmwp * jvnj
+qwnd: 5
+hdlp: 2
+tqzz: zjnw + qrsq
+gjgv: 15
+rgvf: 5
+fjcc: hsrf + dlpm
+tzgb: hzzf * zbrj
+nrrr: 4
+dgnd: cgtp * flrj
+trvb: wvcw * jjgr
+ggcc: 2
+qqbf: dfzz * bqbt
+vpqp: cqfs + sfzc
+szjv: tttz * bmqp
+mrsv: ndhs * dhnp
+pbbp: znsz + fpgw
+nvpf: 2
+dcjm: bfbn * vgmt
+jtrs: lrdv * jjgl
+bhlh: 2
+zmth: 5
+bgwv: 2
+fmwf: 18
+zfdw: 5
+lshr: bssw + fnrq
+tgfj: lndz * bprw
+sgbt: 5
+dfpc: 2
+ghcc: 2
+hsvn: sptq * qjwl
+hqhm: wtbb * shzb
+zlmz: 11
+znvd: btrb + tsvr
+mrbj: rgqs + hmmh
+dcrf: tnhf * qnvr
+cwbn: 12
+dfjr: hrdp - fpbf
+dhtj: 6
+prtl: mdmv * mwsp
+cfdf: 3
+dgtq: sbvj * hwqr
+rvfw: 2
+zcvc: jqcj * pbhs
+ppvr: vcqb * slpm
+gfvf: 2
+czgm: 3
+zbrj: mrsv / lwwb
+ldgn: 4
+vbrh: tltn + fmwf
+zhpb: lchj + vprg
+rsdd: bbtr / fnfv
+rjdl: rjqm + rmzr
+tmfb: 2
+ltzc: mhws * bmqt
+bcmt: 2
+clvh: ldlr * cwqv
+rzml: wpsm + czzm
+shql: rlqt + dzjd
+qgwz: 1
+tvsv: 2
+hblb: tqnd * dmhj
+qqvm: fvfj * lmrn
+sjhh: 2
+drfv: 3
+jtmh: hcgs + lrnh
+blsf: 13
+hzls: qnst * glqg
+ltgh: hwsb + wcfh
+ctbm: brvf * stzh
+bnhm: 9
+hbqd: wbvm * sptr
+jgnr: mrpw * sztf
+bbdm: 3
+bgbh: 16
+gczc: rswg * nhpv
+tlsq: hwqf * brws
+qhzz: 3
+dztc: cdmg * nssj
+zwqj: 5
+hcnp: 8
+zjtq: znnf + jdrw
+wwjr: nrzt * dtcr
+qqvl: 3
+pjnl: bpwz * fhcv
+hvdr: 5
+jvfm: 5
+dmzl: phwf / tzwj
+lpvq: 3
+zzpp: jmhn - mnrt
+lhlp: hjmn * nfqb
+bwdn: 2
+wzrg: 2
+jnsg: 3
+dwhp: 2
+sglv: lzcp * qpqh
+nbfl: 5
+wcfh: lzrz + bsdh
+zzsz: 5
+fqrv: 2
+hbjt: zwgp * hjhj
+ntln: 13
+tdnw: 11
+jhbj: srdc * hjfc
+mzzd: zlqv * rchm
+ttdt: chmd + qqjh
+cgcm: 6
+ngwj: 3
+swnv: 3
+jnsf: nntf + dtfj
+tsvc: mzzd + npbc
+qzbg: 3
+cghs: 7
+qwcd: lnhh / qsll
+tltn: bmhn + qbsh
+pqgz: 4
+rwrh: 2
+zvmf: nltl * lvzt
+qjzc: 3
+gvss: rlrr + hmmt
+lmvz: 3
+rftg: 13
+wpdr: 3
+qbqs: 1
+qfhv: 3
+pvqj: ghcc * gjgv
+dbww: 2
+prqz: 2
+grjb: ptff + wrwt
+rrtv: 10
+ffgz: zzzb * nldh
+bttn: 3
+rttm: 3
+dzjd: gzhn + nzbc
+qwfj: pvtr * dzdv
+btbb: rmpd + lclv
+wgzn: 5
+fzld: nvvv / dzcg
+jlgn: gjgm / rjrf
+pnbg: 7
+lrql: dpzc / mrzq
+cfjg: glfw * thrc
+frgr: tmzz * bpmc
+vpll: 2
+pgzh: 2
+qhnp: 13
+htzb: gdsd * plfn
+dczv: fwhd * sqtt
+pngn: csvm * vqdd
+mdzr: 2
+npqp: dsrz * bqlh
+bnfw: 3
+wnmh: 2
+wssv: qbhr / vvvs
+nnjm: 3
+vcfn: 13
+rcfm: tftj - jltt
+dhvn: jqbh + nnqn
+gdzl: lwhv * bzps
+lcpf: zqzw / clrl
+bhrd: qltz * nlvv
+jfpn: 1
+dmcl: tsjb * vrzd
+czrb: bncf * hgdl
+hlzb: hqvs + qmcr
+cdds: stpv * gwnz
+bpmc: ngwj + fzdc
+dctw: nwmp - mfjq
+mmcc: 5
+vsrf: zfbf * rnsn
+tplb: mgnw * vpqz
+vfzp: vvlw * thdm
+jzww: 2
+dlvh: zqsw + gbvl
+whfz: dhfc / hdlp
+llql: jlgn + bjdn
+wngf: 2
+hrzb: sglf + gndh
+rqps: 5
+htfq: 2
+jnsh: djfz * fwzc
+qdmt: 3
+rpzm: 3
+vqcr: whsj * mfqp
+jzgp: 3
+gngd: 13
+fjnt: 1
+bcfp: jrhp / sdsb
+hmmh: 5
+fldp: 4
+lcwh: hbtg * hjfs
+shzg: hnst + hvdj
+dlnf: vnsp * mbjm
+jjmj: dhqz - znbn
+mlhh: 3
+mrmm: 5
+nqsv: 5
+sbzz: qlpp - qpzb
+gmhw: hjbf * hmnh
+nrzt: 3
+fpbf: 1
+tsvr: pflr - wssv
+tpdj: 5
+fvlh: 11
+bsnt: rsqv * ggvb
+zfwm: qdqr - bbbm
+jzhp: 8
+qlzb: dbbw + mdhm
+tqwn: ftft + dlbt
+vgvp: fmtc + lddb
+dtcr: dfpv / hwgh
+dbjl: 2
+szfd: 6
+vzfl: ftpn * vcrl
+rdtg: nlps * jczp
+vldd: sbht * hqsf
+jjqs: nmwc + znwp
+slmc: 5
+lnzs: nslf * qsdz
+wfft: fpnf + bbwp
+qczq: cgrs + wzzd
+bssz: zrvc * sfrp
+fvfc: 2
+fdhj: mghf * dnqh
+hwrj: mgfn + gtqm
+lnpz: frst + hgvq
+pfvv: pmzs + qjzc
+gsqp: 2
+tqhm: 12
+qhhc: jtwc * mpbs
+pjss: sncv - dsbr
+tjjh: dmnl + zqzn
+wtzc: 3
+mdhb: lmjh * jmll
+ztvl: 2
+vntw: pbhh - nrwg
+zdjn: lvmq + lfph
+vpjv: sztg * lnvq
+tnzz: 2
+bmqt: 4
+tlhq: lpjz * tmqv
+lpzl: qfjp + thwb
+ghlb: vjln * lstf
+wjrb: 3
+wbcn: wfts - tfvm
+jswd: 5
+vdjc: mzwb * wlnf
+tlgw: 10
+csht: dcvp * ftwr
+zflg: trnd + gpsj
+wsmq: 3
+vcrs: 3
diff --git a/day21/solution.nim b/day21/solution.nim
new file mode 100644
index 0000000..bbf77bd
--- /dev/null
+++ b/day21/solution.nim
@@ -0,0 +1,66 @@
+import strutils
+import sequtils
+import tables
+import strformat
+
+type
+  Node = ref object of RootObj
+    left, right: string
+    val: int
+
+  AddNode = ref object of Node
+  SubNode = ref object of Node
+  MulNode = ref object of Node
+  DivNode = ref object of Node
+
+var nodes: Table[string, Node]
+
+method calc(node: Node): int =
+  node.val
+
+method calc(node: AddNode): int = 
+  nodes[node.left].calc() + nodes[node.right].calc()
+
+method calc(node: SubNode): int = 
+  nodes[node.left].calc() - nodes[node.right].calc()
+
+method calc(node: MulNode): int = 
+  nodes[node.left].calc() * nodes[node.right].calc()
+
+method calc(node: DivNode): int = 
+  nodes[node.left].calc() div nodes[node.right].calc()
+
+proc `$`(node: Node): string =
+  fmt"val: {node.val}, left: {node.left}, right: {node.right}"
+
+proc parseLine(line: string): void =
+  let tokens = line.split(": ")
+  let id = tokens[0]
+  let ops = tokens[1].split(" ")
+
+  # if single token -> its a number
+  if ops.len() == 1:
+    nodes[id] = Node(val: ops[0].parseInt())
+  else:
+    let left = ops[0]
+    let right = ops[2]
+    case ops[1]:
+      of "+":
+        nodes[id] = AddNode(left: left, right: right)
+      of "-":
+        nodes[id] = SubNode(left: left, right: right)
+      of "*":
+        nodes[id] = MulNode(left: left, right: right)
+      of "/":
+        nodes[id] = DivNode(left: left, right: right)
+      else:
+        assert(false)
+
+proc parseFile(): void =
+  let lines = readFile("./input.txt").strip().splitLines()
+
+  for line in lines:
+    parseLine(line)
+
+parseFile()
+echo nodes["root"].calc()