Day 21 part 1

2 files changed, 2934 insertions, 0 deletions

diff --git a/2022/inputs/day_21.txt b/2022/inputs/day_21.txt
new file mode 100644
index 0000000..e59658c
--- /dev/null
+++ b/2022/inputs/day_21.txt
@@ -0,0 +1,2643 @@
+nfpr: 3
+mhnp: 2
+lhzg: vgvf * hnfq
+wwnq: hcvc + clwj
+bzvl: 2
+rtbr: fdqt + nwlj
+dgzz: lhnr + fwwm
+nwnj: 4
+hwqb: wcfm * fcrt
+vbdj: 13
+glcj: 3
+mfbw: 2
+wwfg: djwb * lfdc
+pfgc: qscf + wvps
+hmfb: wmvs * sqmf
+smcp: 2
+gbpj: 9
+ncrg: lnfb * vtnc
+lhcf: slrl + hzwm
+pvtg: mprn + hvtr
+vpdc: vcql * pwhq
+tqrl: 4
+mpdf: 5
+zjmz: qssp + mmqq
+ftqz: 2
+fsdf: gdnh + cwwn
+pjrd: 5
+sglv: 11
+bvws: 5
+wcfm: 2
+hbbd: 2
+btgq: fwpm + jgph
+fsdd: 3
+tzgp: wjgz - rfdf
+dvzl: csdd + cfcz
+rqbq: 2
+jhrl: zfvc * rzvq
+wpms: zhcw * qwll
+vrbz: zbwz * cszq
+fcgz: cqht + vhtf
+sthr: thqf + zcjv
+lqzt: 3
+wwcz: hlln * mgmp
+smcs: 2
+trmw: jgzj / qvzq
+tmpq: 5
+dmhl: vrhg - nzmj
+zsww: 2
+rlfh: 5
+rgtn: 5
+bhws: lntz + bvcz
+rfwq: zrmn * fwlf
+djzp: 4
+dgtr: 20
+bmds: bdmb * wdvv
+mjlq: 14
+bfdr: slwq * gjsz
+vrgp: 14
+mmpg: nlff / tlzs
+dphq: ngcc + whhr
+jvwg: fczm * qspw
+nnlc: qgsh * jrrh
+zljq: 7
+hqpf: rznw * pdnq
+dczq: 2
+tsvw: 4
+pnss: 2
+cwhv: fjnl + qhlv
+fwrq: 2
+zmsn: gqnm * mnqm
+rfsv: mpdf * sqgt
+wncg: 5
+lcbg: 12
+wddt: 6
+bcsr: mtqb + bqgf
+hggp: 3
+fmrg: qldl * pqsb
+ctfn: 4
+nhth: wppc + ppgd
+whfn: vhvn + fvzg
+tmvj: szzb * qnjw
+fvpr: fssn / qddm
+wfjh: 2
+dcbm: 1
+bcrw: 5
+svtd: rtfh + dbrp
+jcjm: 8
+fmss: ztst * zjtd
+ppgz: 3
+wmqt: 2
+lhmt: vvzs * bzfv
+gnnf: 5
+hnjf: jwjv * jpbp
+twbv: qpww / jpqp
+rszt: 6
+vqrc: 3
+qnjw: 2
+svlw: tnzj - hdql
+lbgv: 2
+tfcl: 7
+sfvp: mgcq * mjcq
+wqnw: hmhn + njmc
+fvnz: wdgg + vvpw
+rnls: 14
+bvcm: 1
+jmrs: hfls + rldh
+fmsl: cwrq * mnlr
+llzd: jrrf + rzsb
+mzsg: mjlq + pfsr
+wbgz: glhd + hddc
+drzc: 20
+lvzr: 15
+zfdt: 2
+mdww: ltvp * fvld
+tdff: crwh + cppn
+lsdm: 3
+pdsl: 10
+bdtv: 9
+sclb: 2
+llzm: mmmw + wfzm
+lqnw: wqwl * ssft
+qzrc: vbbp * qpzm
+dsmg: 6
+hvts: 6
+rqlq: 15
+tvmj: ppnm + rnjm
+mztc: mczb * gphh
+gvww: 11
+zthb: 4
+svsp: 7
+dcgb: 2
+dbfj: 8
+bdqv: chqt + vhsg
+rczc: 11
+hsgt: 2
+dsfp: 2
+pbrl: rlhg * cgmn
+rllv: hmpl + psbb
+hjjd: mlnr + mmfz
+gphh: 5
+wpsl: lnbh / lsgz
+bdcr: 2
+jrwg: 3
+nhss: 10
+dznz: gvdd + jzss
+hbbs: 2
+gfcg: 2
+tqvc: 11
+jbnw: 6
+tvpz: 2
+nhsn: qgzw / bljg
+hshc: 3
+dhdq: mhpq * qvhp
+tnzj: vthb * hbnt
+rvzd: 1
+vhpp: hblp * clws
+cjfc: stfd - sgcw
+ftgw: bbrt * flsh
+mdjq: 5
+jgmq: 5
+srdb: vsvb * rjcg
+nhvn: 4
+tsnm: cvzt * fjpl
+qgsh: nfrp + ctjg
+fmwr: cbnr * fpwm
+grbv: 5
+nhqc: 14
+nrpq: 11
+crmh: qbqd - jqql
+vqpl: hqsf * ntlp
+ctbh: 9
+prjm: 3
+rtzd: 2
+jznz: tjls + pgcq
+dqnh: 2
+sfrc: twjv * bblj
+njfq: qhfj - lvpl
+nfzm: vlvg - brmz
+dvwv: rfsv - clcl
+wjwl: 2
+ggjh: 3
+jlcj: tcbz - crjq
+rlhg: 3
+bnzz: 3
+sgvc: 2
+gjtl: zwnl - vjfd
+rnjm: dqps * vdlz
+fwwm: 4
+hpct: 2
+hbbb: mrjw - fggh
+pnjg: rpgs + qpns
+mnqm: 4
+hvpt: 1
+znld: mnwq * ctnp
+csgj: 5
+cwff: 2
+rzfp: wbqm * mflz
+vlvg: jltj + tgmh
+gshc: 3
+fjqv: 3
+trnf: cbhv * fjqv
+bljg: 2
+srgr: dznz + ntnr
+fssn: rjfs + mzbb
+sdfd: 2
+tnrt: vpdc + vsqz
+jtjj: gtls * tcbp
+cmvw: 2
+cqht: jrdb + gwqq
+brct: 5
+rqjj: zllt * rvwc
+jvzn: qncv * jftn
+hszt: ldmb + sncl
+wcpw: 2
+mlld: 1
+tfwz: gdmq / qcrp
+hrfq: 11
+mlnr: vjjh * wftp
+rzvt: 16
+ccht: 2
+wsrh: rzvt * thbq
+nfrv: 4
+hwzq: ldps + fvhc
+flsg: 2
+flzc: jpsv + tcgs
+qjdw: 2
+zhjs: 3
+wtjm: vtgj + jdzv
+qtzl: 12
+ltgp: 3
+tmst: 2
+vctd: rqbq * hmtb
+btzj: 2
+qbcp: 2
+bbcm: vjhz * mhps
+qhfj: pfdj + mdrm
+bzjj: dbnq * tvmq
+mjvq: bqzm * mhrp
+wrdz: vqlc + rqtj
+gvnr: 4
+nchp: 13
+fwpm: vmjg - rbnb
+dzpb: dsmz * zhnb
+bmfv: hzcn + csgj
+qbzh: 20
+tzhq: 3
+fcrt: fsdd * sgtb
+trdv: smpc - vwrc
+hmnj: 20
+cdhn: lccv * qcpp
+zwhl: wzmh + fdtg
+sgcf: qfsn + wbps
+vpdd: hqdt + pnhl
+bbdd: rjbv * pmrz
+rjpc: 3
+bfdj: zfwf + nfnf
+gjbq: 2
+jhst: 5
+qdcn: 3
+jljn: 2
+pglr: hcsm / wncg
+tthz: 3
+rvwc: 2
+ctjg: 5
+ppjr: 7
+gmpb: 9
+rspn: 5
+vqhh: pqjw + lpnj
+vljn: pzpn + hvts
+bdmb: scqr - hqpv
+wfsl: qpdp + zzmg
+cnpn: slpb * ggqm
+sczh: 3
+dqss: czgd + ppsj
+pfpc: wdnm * grgl
+rnzm: 5
+tbch: gcjw + dczj
+zmwd: 14
+ftph: nzzt + fnld
+vwss: 4
+hlvz: glwd - rzms
+psps: lvcl * gwfw
+cdjd: hvjv + djhh
+nqsf: 2
+ngmc: 7
+sllg: 2
+lrpq: cjwd * ffms
+hlmj: rnmc + bjvz
+vfbl: 5
+chwr: qjml * pldf
+btwf: svnh * glmg
+bmdp: 7
+sqrf: 7
+jznp: 5
+gnbn: 7
+zlcq: smjc * crlr
+lvpl: nvqf * bdqh
+bsts: pscb + zzhj
+hszv: bhph * tvpf
+vcsm: rhnq * rfvf
+lfdc: zlps * jpmf
+rjgb: qwlf + jdhv
+fddj: pdtv * shgn
+bvzm: rbmv * sbvv
+dtzc: nwfq + nrpq
+cmqs: bvzm / fvws
+mtqb: smzd * bsdw
+lgwp: 2
+shgj: jhgf * zcth
+swzq: 5
+rdtm: rqqs - wdss
+rtqj: 2
+cwqh: 1
+fmhd: hmhh + mrdd
+czwr: vdjr + gnjl
+wdnm: 4
+cbmr: mvld * sfsz
+ndzq: 5
+ssft: twdv + cnqg
+qprn: 2
+mqpw: 2
+fpjd: 3
+grhd: 2
+nrrw: 2
+dzwb: 4
+zhfb: wmsh * pglr
+cltn: 3
+hcqq: brgz - nwqz
+bnwn: 16
+phst: 2
+gvhz: 3
+ghzb: smwj * rlgp
+plbm: pljz + wqzz
+cszq: rsbn + tlvd
+jpbp: cwwh + nvhl
+nsmc: 3
+cmtg: bmfv * shjm
+qrmt: zrvw + bbcm
+nlsh: nwwh + tsrb
+qwgt: mdcw + fvmv
+bbbr: 3
+vdwd: 3
+hmmt: nzsl - gbpj
+tvtl: hnlg - tfjv
+qbqd: dhpj / wfrs
+fggh: mbpm * rjtp
+cjns: wlbh - mjtq
+wtmf: rtdl * mmwf
+nwwh: gnvm + crlq
+cqvm: zqwb * wmjj
+lrvz: ttqc + bdmc
+bbrp: 4
+dfhb: 2
+nzmg: bsrm * qhwf
+lgdg: 3
+rbmw: tfcl * pwlm
+pdmt: hgrb * jvzn
+gnpg: 5
+dbhn: 9
+wdvv: qvvq * ctvj
+gnjl: bdvs / qqgl
+szhm: crnh + jmpv
+zwmv: hgfz + mghg
+cnsf: 10
+dbnw: 3
+cpth: lgrc * hwzd
+ftjv: ltlv + qzpj
+shnl: 2
+smmv: dvjp * bnzz
+lrzq: 2
+wffl: 2
+zwgd: lhzg / jzwp
+qhnn: gcgj * scnf
+mdqb: 1
+wwzh: 2
+slnn: 11
+qqms: vdrc * hczr
+jzcf: 4
+wfrs: 2
+vgcm: 2
+qrwj: 4
+bwsz: 5
+mrqn: 2
+zhww: 8
+crnh: 20
+wcnr: dgqm + jnwd
+nmsg: 5
+fffw: wtmf + fvml
+jbjw: 2
+zjlc: rrmg / dzdc
+lnbh: qlwj - jtvr
+dbrp: jhfh + nqsj
+vrhg: pvsv * vwfj
+tnqd: 13
+ggwv: 2
+mmrb: hrpr + rfcp
+wgqw: 2
+qnzm: 3
+njsv: 4
+fjsf: qcsn + mjml
+dfpz: 2
+hnrh: 3
+fjsz: tsvw * bvmz
+tvzz: nwsv + znpt
+dmwl: 19
+rlqz: fgjb * zpvw
+hqsq: njsv * cwff
+zbdg: 2
+mrdd: vbcp + srfw
+dwvm: bbdd + nnpg
+grhg: 2
+qtqf: twgn + cbtm
+drst: jwwn * rwhd
+bnbw: 7
+zbfp: dzpb * dqss
+pndj: 1
+jrdb: 16
+ffws: lrnq * qvbs
+jmhp: 2
+rqpl: 11
+pjdn: 6
+brjh: prrc + ldlt
+ttrt: 4
+ctrv: 2
+jdzv: 6
+pbpg: 2
+jtsc: gpjc / nrcz
+glwd: 18
+tstt: zbzs * zzlb
+gdqb: nqnv * qnpg
+vlnc: msfz + pgvw
+znpt: vnwb * jtdr
+jhwc: 4
+qhlv: lrhh * ntdb
+lctr: 3
+tswc: 3
+gtgp: sjgz * dbsj
+zwnl: qvjp + jhpn
+lgpt: jtdg - mbvj
+tcbp: 2
+bjwf: fvwf - hjjd
+cvzn: 3
+pqqd: ljbw + jsdl
+gdnh: jvqq - spjj
+whnr: 13
+qddm: 3
+qpwq: dvfn / gwhz
+szfr: 5
+cbfz: dszf + nfmc
+pmdb: bsvj * mqqg
+dznt: pfcl * tcts
+lgsg: qvhh * dtcn
+mdzp: 3
+fcjv: 6
+bdlp: jjjm + hpzz
+zhrs: hvnj * bmjr
+ngnz: 2
+clpj: wcdg - srml
+npjm: 3
+vfnt: cpth + cwbb
+ldll: bmnh / zhrf
+dvst: lqzt * rfjz
+tblh: 20
+vpvs: nhqc + btgv
+dtqb: 5
+djdt: fzpz * vhbz
+hpcf: 17
+zfvc: 9
+glmv: pbrl + hqwr
+crfq: 3
+jzrl: 3
+ndzf: pldm + qvfg
+twml: 10
+hbzb: 3
+llwt: mwst + gtgp
+brnm: 3
+hzbg: fvbf * sfbf
+cflr: 7
+jgzj: ztjq * sznf
+gjmn: qdcn * gbpm
+zjpq: 2
+vntg: 2
+zhnb: 5
+zvzb: 4
+qggg: 1
+ghdm: 2
+gwlf: 4
+tqhb: mgjb + mwnm
+lmwv: sqjm / ppgz
+tbnn: 14
+gbcw: hrwd * vcqz
+dzzl: wltr * vljn
+mqqg: rbvv + dvzl
+pbdp: rpcp + nlsh
+wcst: 3
+qfcn: 2
+vdtd: qfrh * rqlq
+bhnm: 2
+vqlc: fvpr * wfnt
+rshw: cnfd * vwfv
+gdbn: nlbv - shnt
+gzpt: jqgn + swzj
+qfqb: 4
+srvg: fvjc + rzdl
+qzpd: bnfs * zpvm
+mfrv: 2
+bpfp: 2
+msgw: 2
+jqql: rhwf * gmbl
+mmcp: 2
+rjbv: fcdn * vplt
+pgsc: gdjm / sntl
+wzbr: 2
+jrpl: 3
+tscf: 2
+wtqz: zhbf * twgp
+nnrt: vfhp / gnbn
+cssz: vqhh + bmds
+gmdz: hphs + rnvf
+pwhg: hbbd * qqll
+zznw: 2
+slpb: 2
+clwj: 3
+hdbf: mmzp / sbfm
+tdnq: 3
+bwnp: whwz * mfjg
+jpwt: wsll * ltwt
+mvld: 4
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+qhwf: lgjp + pjdd
+nrcz: 2
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+snhg: nbzn * mlsq
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+lbvl: 7
+nqfq: sdcq - tnpn
+dcrf: 5
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+svfg: 3
+ttrs: chnw * wghb
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+zmwq: 6
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+gpvt: rnls + twwc
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+wjsq: 3
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+ztst: ndzq + ndds
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+znbq: 1
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+lrmh: shwb * grhg
+ljwm: 5
+fmht: rwgb * sdfd
+dzdc: 2
+ctzn: jglt * jlnt
+dnsd: zzld / flsg
+dmlh: drbc * lsdm
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+vsqz: dflr * tblh
+ftss: 5
+gntf: dnmm * wvss
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+qgpm: 2
+hqwr: hhmn * cwvr
+bhhj: 2
+vmss: 6
+sqmf: 3
+pscb: cjfc * sjbq
+wvps: zjsb + jbnw
+fsfs: bmsr + nltq
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+fnbg: 5
+pjwn: 4
+nwpp: 2
+mdnv: ghpn + jpnn
+rwhd: rnzp * whbg
+twjm: fghf + btjt
+tvtg: 18
+vplt: 4
+cflt: wtzs * vvzb
+hqcr: pczl * nnjh
+tdsq: nwrd + dtzc
+zsms: 3
+vjpt: 15
+cmgw: 2
+hmhn: 16
+jvqq: qzhj - wwwf
+fvzg: strg + jpnr
+wmvs: hzvv - fbmp
+pgrs: 4
+bbrn: cnpn * htrc
+jsnc: phld / gvhz
+wftp: 8
+mmfz: 20
+zzmg: 6
+scnf: mfrv * mlbh
+bdqh: 3
+jtdr: ttrs / fdzp
+pwnn: 10
+qpns: bjwf - mhvw
+nqhg: bszp * qmmn
+tlzs: 3
+bslr: vzlb - wwmm
+fpsb: swdm / brvg
+znll: 2
+tjjc: tdff + zjmz
+fdlt: 8
+nvhl: 5
+rzsb: ggzt - dwmq
+crpm: dcjz + tfgm
+svvz: 4
+qznn: tgrj + lsnr
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+zqnt: 11
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+hgqf: 4
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+tngh: tpjl * dnhb
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+pwbl: wlzt / snvz
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+lwmw: nchj + zvrv
+vssp: czjl * qrqt
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+dfqr: nrpj * lchz
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+pcpq: znfq + rjqj
+zmsr: sgbp + nnrt
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+hpzl: 3
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+cbnr: 5
+cfzl: 4
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+fvdd: hbdz + fptg
+hjnv: vwhz / gsjp
+glmg: 4
+ljbw: shsb + lhvd
+thcl: gvsp + shrc
+zbtt: qfrl + prgw
+dbch: 2
+chnw: 3
+gshw: 3
+vhff: wsdc * jwsn
+hrpb: 5
+vdrc: bfdj + nzql
+rnmc: dztm * wjsq
+rpgs: dnrv + djvb
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+qqll: 3
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+zspd: tcms + wjqg
+bsdf: gwsw + hfcm
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+qscf: 2
+twwc: qfcn + btpj
+vprm: 2
+cstf: 3
+cpnn: 16
+prjv: 6
+fhtq: jhwc + hwdc
+jqgd: dfpz * zbzn
+qmtw: dsqh - cfdg
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+ptzv: 3
+gwtf: mhnp * zlvb
+dwmq: bbrn * cbtq
+twgn: gwbm * csjj
+wmhp: 3
+dglq: qvjl * pnss
+clvq: 2
+nqhc: 2
+ngcc: svsp * cfzd
+pgwh: ltgp * wzdn
+mmjj: lswr * lnfd
+jrdz: 2
+jgzn: 5
+vgwp: 14
+wdzn: 14
+rjqj: trtn - ddcr
+lnfb: 3
+phwt: 6
+fvrt: 2
+pbnl: cltn * plsg
+vvzs: 2
+fbdr: szhm * jnth
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+fnnn: 1
+jrzg: 7
+tfct: 3
+wrrn: 17
+zbcd: wtlj + tjrd
+pmhg: 3
+trrw: 3
+flsh: 3
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+fvqn: lcwf * ghtz
+jjfl: tvtg / tlvj
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+dqpt: 3
+fsvt: 2
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+bngh: drst + bvsq
+jwpq: lmcb * blnh
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+qzss: pmtz * pdmt
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+qqgl: 5
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+phld: rtwh * vdwd
+qvjl: 3
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+whph: fztz / wffl
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+vhdj: cddq * dcrf
+mflz: 3
+dztm: dgfd + pwnn
+jtvr: 4
+lgcb: hllz * dbfj
+ndmp: ctbh + jbqh
+gjzm: 14
+fvqc: 6
+nlnt: twbv * tngh
+cfdg: 5
+mcvg: jllb / zjvc
+lhww: 2
+vhtf: 8
+vnqz: bzjd / qfsc
+qmmn: 20
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+sfcf: fvtb + ttfr
+hzvb: thvd * pltc
+ngmt: bttc + brjz
+jppb: 3
+zgss: 3
+lcwf: zwmj * djnj
+cddq: 5
+jldf: hmzt + rjdq
+cpfv: 18
+jwzl: brqv * dbnw
+mshv: 19
+ttqc: rcbf * vbnz
+hhjd: 2
+jwvv: dbmn + rtbr
+rfdf: 3
+zrrn: 9
+jzlt: 1
+tcts: 5
+rlpr: 6
+srml: mzmw + tvwc
+cfjv: sjbj + dvst
+nzmj: lpmr + jppg
+trtn: rdbq * mqpq
+zlps: vmss + tngz
+ppqb: frlh + gvwb
+slrl: 14
+cdhm: qgjc * nqhg
+hfls: 4
+htzh: 14
+pjdd: 8
+jtdg: nfvj * ddcv
+jwqd: 2
+lbdn: 4
+zlsj: 4
+jblw: tndh + dsfp
+bnnm: 4
+mjcq: 5
+fvwn: 17
+msfz: 13
+vrhc: 3
+mfcn: cnpj * shbj
+mdmw: 2
+jhjz: pmjn + ppzn
+rqqs: rdbd * rjpc
+ffms: 4
+cppn: grvz - fvqq
+thwd: 5
+hnnl: 4
+bwwh: smmv * gshc
+wqgs: 5
+csrp: 5
+qhhf: nfpr * phwz
+mqlz: hrvs + ghht
+fcdn: 3
+hgfz: prsj + nwmq
+glnb: jssv / prjm
+ltlm: mpmq * nvjg
+rlpz: jtcz - wrlb
+wgst: 9
+ldnw: tltg + mhqb
+hnfq: 2
+scsc: rnnh * jftv
+tdwg: jjfl * dmnf
+cvjb: djps + bqpb
+slwg: nlml * wbgz
+cdlc: 11
+mlrb: 3
+rlqb: 2
+gcjw: 6
+qwll: 7
+lccv: 5
+ntlp: jvjb * fvwn
+swfb: jshd + zljq
+rdbg: 5
+szwn: 6
+fvld: hvsl + jsfz
+pldf: ggwl + lcsh
+hgqn: 18
+slbz: mqdq / jrtr
+ggfs: jzvc + rzlz
+ttrv: lrsl + gntf
+wbps: mqlc * dwvm
+djln: chbl * vjcg
+jrvg: 2
+ltlv: 1
+twjv: dqph * fmhd
+pdqv: 2
+nfvj: 4
+lqzz: 11
+dncn: 2
+bqgf: vhtm + hpcf
+wfnt: 5
+wdmq: 2
+wbmh: svfg + ltzn
+lwmv: 2
+ddtg: dlzh / nbzv
+cwwh: 2
+hdsf: pfpc * fbfr
+rznw: fspn + pwhg
+bwhd: wfgq / pmtj
+zllt: nqhc * jlrq
+qggs: vrbz + lrpq
+slhl: 10
+htnf: jgnq + tnmq
+zrqr: hqcr * nqfq
+dpfm: nszt * cvzz
+lqqv: 4
+wqtm: 15
+tfcn: dlbc * gfcg
+dgfd: 7
+tqbq: 3
+qzpg: 2
+dzsp: 5
+czmc: gzmj + jtmr
+hrgt: vvvv * jqmp
+cwmb: ncwh + zvdt
+hhnd: 13
+scsr: vnmv + qnzm
+czjh: 8
+lltn: mdfp * zbcd
+qlzj: tmtw + gdjv
+dwsv: ztds / bhhj
+sjtb: nzvt / jbjw
+fwbj: 13
+hgmq: zwhh + bwnp
+lmpn: vctd - mwrw
+cnlg: tbwz + znmj
+mvwl: snhg * dfdc
+lgrc: 17
+qpzm: lfqh + vcsm
+nzzt: fddj / gwlf
+dzpd: 10
+pvgb: 18
+zgjq: 2
+dqqp: 5
+qvdr: clnl * svrm
+fzfb: 2
+jpmf: 2
+gwws: 4
+nvqf: 2
+qlwj: nchp * jljn
+crgm: 2
+fqlf: 15
+vthb: qqvm / zbmz
+mjvd: 7
+sjzd: sjnt + pjmt
+trzs: 7
+pwvq: tthn + lnrs
+jtsm: 3
+ztvn: 4
+btjt: jqhf * nlht
+jnth: 2
+vdlz: cnlg + htvv
+jcps: 3
+hgjw: 5
+frgf: 2
+bqzm: ngmc * sbsb
+dhst: ljhh + cmwc
+nbzn: 5
+qbqw: dnft * jzgn
+wdss: 9
+smpc: qgsj - hwdg
+jcvd: ctgw * rnhl
+hdgg: 3
+gzjd: 5
+cwrq: nhns + lszv
+fdtg: bhqt * zrhz
+fphj: zqpr + fvzm
+zcjv: 7
+wfwm: 2
+hnlb: 2
+tpjl: 3
+nfrp: 6
+pfdj: pwwq - bnnm
+lpgv: 2
+gvmg: 2
+frlh: qfbn + lqnw
+vtjd: 5
+jhzl: zznw * ffrj
+lsps: lgcb + gpbj
+gvhs: ftlq * sgbl
+qqvm: tvpz * bsmg
+ghpn: 1
+fvhc: 15
+hjzj: ltfn + nwnj
+bjbn: 1
+wrsj: 3
+jhfq: 18
+dvqw: wpsl * qcbj
+gsjp: 2
+splh: 2
+ttcz: fmcq * gjtl
+nlff: vssp * djhv
+wrcb: 3
+ntnr: cvzb / lzlv
+bzdh: 2
+fvcg: 3
+tndh: hlbh * ngtq
+vhbz: dmvt * vwvt
+rwgb: vmrz + cjwr
+zvrv: jgmq * fmcm
+zzld: pqls - zgcc
+mpzw: 13
+lhjh: bclm * hpct
+qbnz: bnwn + qqms
+zcjg: svzg / rgjv
+mjtq: frgf + hwmz
+htcn: 4
+jzmv: hczq / thtd
+slsw: 3
+qppn: dfbn * lsfl
+jnqm: 17
+lhsj: czvp * pfgc
+jsfz: 1
+qnqt: zzgp + wrcb
+zzlb: 3
+rpcp: htzc + lchd
+hhrh: 13
+rbvv: fffw / hvdn
+fjbm: 4
+pbvv: bqvn + wprd
+rlgp: 7
+jvjb: 2
+ggfw: 5
+jgdp: 3
+strj: hllw * jbqq
+vfvl: 4
+qzqg: 13
+zpnz: shrv * qzds
+mljz: svnj + rlpr
+lrsl: lzhd + vvgr
+nqwc: rcrt * jhst
+gsbh: ggjh * vnjr
+mlqn: bphw + rvzd
+cjwr: cmpb + cwnc
+clnl: 5
+pldm: cmdr * ttvw
+tfht: ttgl * hlzh
+wzmh: cdlc + nlcp
+hlhp: 1
+bdtn: 2
+zwmj: 3
+tgrb: hzvq * drmd
+vfhp: wsjv * bgft
+nzjr: bvqz + hshj
+jllb: jwpq + mljz
+gflv: srdb + wsrh
+mhqb: pjqb * fmpw
+tfcv: gtvt * tfnd
+vjhb: 7
+wprd: zcjg + vgwp
+fqmt: pzfv * pdqb
+zpcr: 3
+hvgm: 17
+bwqc: 5
+qsbv: qfpz + vbrn
+crwh: 1
+lfcj: bwhl * hmrv
+qpdp: vvgf + qhhf
+prrc: ctzn / qgpm
+tjmn: 5
+jssv: qlgh * dqpt
+dbjs: jrzn - gdrc
+cnrf: hgcf * bjtf
+dbgc: hzph * mfmp
+bdwh: dppw * zmsn
+wfbf: tqbq * zcfj
+nppj: 2
+mssm: vqcr * qggs
+gbvt: gbgp * tmvj
+ghpm: dlnc + dbfr
+hllw: wsrd + zngq
+jvmt: lqtg + bwjl
+tthn: hjwl * fzgh
+qrtc: rvbl / djvz
+dlzh: rwll * lwmv
+nzvt: fzfb * bwhd
+cvzz: 15
+pwhq: 2
diff --git a/2022/src/bin/day_21.rs b/2022/src/bin/day_21.rs
new file mode 100644
index 0000000..7b23bab
--- /dev/null
+++ b/2022/src/bin/day_21.rs
@@ -0,0 +1,291 @@
+use nom::{
+    branch::alt,
+    bytes::complete::tag,
+    character::complete::{alpha1, i64, line_ending},
+    combinator::map,
+    multi::separated_list1,
+    sequence::tuple,
+    IResult,
+};
+use std::{
+    collections::{BTreeMap, BTreeSet},
+    fmt, fs,
+};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("inputs/day_21.txt")?;
+    let mut monkeys = Monkeys::parser(&input).unwrap().1;
+
+    dbg!(monkeys.eval("root"));
+
+    let (original_root_left, original_root_right) =
+        monkeys.0.get("root").expect("No root monkey!").values();
+
+    monkeys.0.insert(
+        "root".into(),
+        Expression::Eql(original_root_left, original_root_right.expect("foo")),
+    );
+    monkeys
+        .0
+        .insert("humn".into(), Expression::Value(Value::Input));
+
+    // TODO: This should be some sort of loop until done. It isn't complete yet.
+    monkeys.simplify();
+    dbg!(monkeys.0.len());
+    monkeys.simplify();
+    dbg!(monkeys.0.len());
+    monkeys.simplify();
+    dbg!(monkeys.0.len());
+    dbg!(monkeys.print_expression("root"));
+
+    Ok(())
+}
+
+#[derive(Debug, Clone)]
+struct Monkeys(BTreeMap<String, Expression>);
+
+#[derive(Debug, Clone)]
+enum Expression {
+    Value(Value),
+    Add(Value, Value),
+    Sub(Value, Value),
+    Mul(Value, Value),
+    Div(Value, Value),
+    Eql(Value, Value),
+}
+
+#[derive(Debug, Clone)]
+enum Value {
+    Ref(String),
+    Literal(i64),
+    Input,
+}
+
+impl Monkeys {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            separated_list1(line_ending, tuple((alpha1, tag(": "), Expression::parser))),
+            |lines| {
+                Monkeys(
+                    lines
+                        .into_iter()
+                        .map(|(id, _, expression): (&str, _, Expression)| {
+                            (id.to_owned(), expression)
+                        })
+                        .collect(),
+                )
+            },
+        )(input)
+    }
+
+    fn simplify(&mut self) {
+        let ids: Vec<String> = self.0.keys().cloned().collect();
+
+        // simplify to literals where possible
+        for id in &ids {
+            if let Some(val) = self.eval(id) {
+                self.0
+                    .insert(id.clone(), Expression::Value(Value::Literal(val)));
+            }
+        }
+
+        // simplify single sides of expressions where possible (especially unwrap refs)
+        for id in &ids {
+            let monkey = self.0.get(id).expect("Unknown monkey!");
+            let simplified = match monkey {
+                Expression::Value(v) => Expression::Value(self.simplify_value(v)),
+                Expression::Add(a, b) => {
+                    Expression::Add(self.simplify_value(a), self.simplify_value(b))
+                }
+                Expression::Sub(a, b) => {
+                    Expression::Sub(self.simplify_value(a), self.simplify_value(b))
+                }
+                Expression::Mul(a, b) => {
+                    Expression::Mul(self.simplify_value(a), self.simplify_value(b))
+                }
+                Expression::Div(a, b) => {
+                    Expression::Div(self.simplify_value(a), self.simplify_value(b))
+                }
+                Expression::Eql(a, b) => {
+                    Expression::Eql(self.simplify_value(a), self.simplify_value(b))
+                }
+            };
+            self.0.insert(id.clone(), simplified);
+
+            if let Some(val) = self.eval(id) {
+                self.0
+                    .insert(id.clone(), Expression::Value(Value::Literal(val)));
+            }
+        }
+
+        // simplify across the equals
+        // TODO: There are probably more of these cases needed
+        for id in &ids {
+            let monkey = self.0.get(id).expect("Unknown monkey!").clone();
+            match monkey {
+                Expression::Eql(Value::Ref(r), Value::Literal(v))
+                | Expression::Eql(Value::Literal(v), Value::Ref(r)) => {
+                    let referenced_monkey = self.0.get(&r).expect("Unknown monkey!").clone();
+
+                    let new_eql = match referenced_monkey {
+                        Expression::Add(Value::Ref(new_r), Value::Literal(added))
+                        | Expression::Add(Value::Literal(added), Value::Ref(new_r)) => {
+                            Some((new_r.clone(), v - added))
+                        }
+                        Expression::Sub(Value::Ref(new_r), Value::Literal(subtracted)) => {
+                            Some((new_r.clone(), v + subtracted))
+                        }
+                        Expression::Mul(Value::Ref(new_r), Value::Literal(mult))
+                        | Expression::Mul(Value::Literal(mult), Value::Ref(new_r)) => {
+                            Some((new_r.clone(), v / mult))
+                        }
+                        Expression::Div(Value::Ref(new_r), Value::Literal(denom)) => {
+                            Some((new_r.clone(), v * denom))
+                        }
+                        _ => None,
+                    };
+
+                    if let Some((new_r, new_v)) = new_eql {
+                        self.0.insert(
+                            id.clone(),
+                            Expression::Eql(Value::Ref(new_r), Value::Literal(new_v)),
+                        );
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        // clearing out unreferenced monkeys
+        let monkey_references: BTreeSet<String> = self
+            .0
+            .values()
+            .flat_map(|expression| match expression.values() {
+                (Value::Ref(v1), Some(Value::Ref(v2))) => vec![v1, v2],
+                (Value::Ref(v), _) | (_, Some(Value::Ref(v))) => vec![v],
+                _ => vec![],
+            })
+            .collect();
+        for id in &ids {
+            if id != "root" && !monkey_references.contains(id) {
+                self.0.remove(id);
+            }
+        }
+    }
+
+    fn simplify_value(&self, val: &Value) -> Value {
+        match val {
+            Value::Ref(r) => {
+                let referenced = self.0.get(r).expect("Unknown monkey!");
+                match referenced {
+                    Expression::Value(v) => v.clone(),
+                    _ => val.clone(),
+                }
+            }
+            v => v.clone(),
+        }
+    }
+
+    fn eval(&self, id: &str) -> Option<i64> {
+        let monkey = self.0.get(id).expect("Unknown monkey!");
+
+        match monkey {
+            Expression::Value(v) => self.resolve_value(v),
+            Expression::Add(a, b) => self
+                .resolve_value(a)
+                .zip(self.resolve_value(b))
+                .map(|(a, b)| a + b),
+            Expression::Sub(a, b) => self
+                .resolve_value(a)
+                .zip(self.resolve_value(b))
+                .map(|(a, b)| a - b),
+            Expression::Mul(a, b) => self
+                .resolve_value(a)
+                .zip(self.resolve_value(b))
+                .map(|(a, b)| a * b),
+            Expression::Div(a, b) => self
+                .resolve_value(a)
+                .zip(self.resolve_value(b))
+                .map(|(a, b)| a / b),
+            Expression::Eql(a, b) => self
+                .resolve_value(a)
+                .zip(self.resolve_value(b))
+                .map(|(a, b)| if a == b { 1 } else { 0 }),
+        }
+    }
+
+    fn resolve_value(&self, value: &Value) -> Option<i64> {
+        match value {
+            Value::Ref(id) => self.eval(id),
+            Value::Literal(num) => Some(*num),
+            Value::Input => None,
+        }
+    }
+
+    fn print_expression(&self, id: &str) -> String {
+        let monkey = self.0.get(id).expect("Unknown monkey!");
+
+        match monkey {
+            Expression::Value(v) => format!("({})", self.print_value(v)),
+            Expression::Add(a, b) => format!("({} + {})", self.print_value(a), self.print_value(b)),
+            Expression::Sub(a, b) => format!("({} - {})", self.print_value(a), self.print_value(b)),
+            Expression::Mul(a, b) => format!("({} * {})", self.print_value(a), self.print_value(b)),
+            Expression::Div(a, b) => format!("({} / {})", self.print_value(a), self.print_value(b)),
+            Expression::Eql(a, b) => {
+                format!("({} == {})", self.print_value(a), self.print_value(b))
+            }
+        }
+    }
+
+    fn print_value(&self, value: &Value) -> String {
+        match value {
+            Value::Ref(id) => self.print_expression(id),
+            Value::Literal(num) => format!("{}", num),
+            Value::Input => "input".into(),
+        }
+    }
+}
+
+impl Expression {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        alt((
+            map(
+                tuple((Value::parser, tag(" + "), Value::parser)),
+                |(a, _, b)| Expression::Add(a, b),
+            ),
+            map(
+                tuple((Value::parser, tag(" - "), Value::parser)),
+                |(a, _, b)| Expression::Sub(a, b),
+            ),
+            map(
+                tuple((Value::parser, tag(" * "), Value::parser)),
+                |(a, _, b)| Expression::Mul(a, b),
+            ),
+            map(
+                tuple((Value::parser, tag(" / "), Value::parser)),
+                |(a, _, b)| Expression::Div(a, b),
+            ),
+            map(Value::parser, Expression::Value),
+        ))(input)
+    }
+
+    fn values(&self) -> (Value, Option<Value>) {
+        match self.clone() {
+            Expression::Value(v) => (v, None),
+            Expression::Add(a, b) => (a, Some(b)),
+            Expression::Sub(a, b) => (a, Some(b)),
+            Expression::Mul(a, b) => (a, Some(b)),
+            Expression::Div(a, b) => (a, Some(b)),
+            Expression::Eql(a, b) => (a, Some(b)),
+        }
+    }
+}
+
+impl Value {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        alt((
+            map(i64, Value::Literal),
+            map(alpha1, |s: &str| Value::Ref(s.to_owned())),
+        ))(input)
+    }
+}