From 950e109848a2981ad979171e810ae7b6e12d77b2 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 21 Dec 2022 15:10:59 -0500
Subject: day 21

---
 benches/2022.rs       |    5 +
 data/2022/21.txt      | 2087 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/bin/2022/day21.rs |  227 ++++++
 src/bin/2022/main.rs  |    2 +
 4 files changed, 2321 insertions(+)
 create mode 100644 data/2022/21.txt
 create mode 100644 src/bin/2022/day21.rs

diff --git a/benches/2022.rs b/benches/2022.rs
index 60b5b3c..e4c40d5 100644
--- a/benches/2022.rs
+++ b/benches/2022.rs
@@ -41,6 +41,8 @@ mod day18;
 mod day19;
 #[path = "../src/bin/2022/day20.rs"]
 mod day20;
+#[path = "../src/bin/2022/day21.rs"]
+mod day21;
 // NEXT MOD
 
 day!(2022, 1, day1);
@@ -63,6 +65,7 @@ day!(2022, 17, day17);
 day!(2022, 18, day18);
 day!(2022, 19, day19);
 day!(2022, 20, day20);
+day!(2022, 21, day21);
 // NEXT DAY
 
 fn bench_2022(c: &mut criterion::Criterion) {
@@ -88,6 +91,7 @@ fn bench_2022(c: &mut criterion::Criterion) {
             day_combined!(2022, 18, day18);
             day_combined!(2022, 19, day19);
             day_combined!(2022, 20, day20);
+            day_combined!(2022, 21, day21);
             // NEXT DAY COMBINED
         })
     });
@@ -116,5 +120,6 @@ criterion::criterion_main!(
     bench_2022day18,
     bench_2022day19,
     bench_2022day20,
+    bench_2022day21,
     // NEXT GROUP
 );
diff --git a/data/2022/21.txt b/data/2022/21.txt
new file mode 100644
index 0000000..2d1fd90
--- /dev/null
+++ b/data/2022/21.txt
@@ -0,0 +1,2087 @@
+dvlj: 6
+wwth: vvpf + hwcp
+mnzt: zgrl * tpbs
+llmq: smwg * nbrl
+sjgr: vsfh + lsdf
+zsjj: 12
+mctz: 4
+frnf: wwnw + vjrn
+nzgv: 2
+cpfs: 6
+fsfn: zznl * bgnb
+nhrh: dphm * lrhl
+hcrw: wvjr * hbzc
+nbvf: 2
+dbwl: 2
+pvmn: 2
+gzpd: 3
+vpmt: wcpl - mnnl
+frqd: 16
+zrgr: 10
+qcws: cnqp * shhw
+fjwd: 4
+nlsd: 2
+fgnb: 5
+pjsn: pljb + wbbj
+jwrd: 2
+hrpb: blgd * wrnv
+lwvh: rfpp * wnlb
+pwcr: 2
+ldjv: trpl + mjts
+znmt: 6
+gmmg: 17
+rrcd: tpfj * grgl
+nfnf: bspf * qvsf
+pswv: ngwc * zhzd
+mllb: rdfg + jpjv
+hmwt: lvdt * nzjn
+shff: dfwr + pzgq
+nsdn: pznn * vbwf
+dfsw: 2
+hhsz: vbcm + lgvq
+fdwm: 11
+hrgv: jsfg * zzrp
+rjbw: fbqp * qrgc
+jsbm: hgmj + wfvt
+ngcp: mvhv + gsns
+smwg: 2
+jqts: 3
+vrbc: jvhw + qlfg
+lqpq: 5
+ntht: jwsf * cvhj
+hqtl: 2
+mhcj: hrpb - qcbj
+ldwg: phtb + jpnw
+bwcr: 2
+vbbd: bnvf + hcrw
+zbdm: jmwd / vqqg
+lpvl: 5
+wvmm: mnfb / spbl
+cghh: mflz + ghms
+jgbw: 10
+jffg: sjjm + qwfw
+cdrn: 3
+vrff: dzpd * pmnh
+tdwf: 3
+dvsf: zbzz * zpls
+fnbm: 2
+pspv: shsc + bzcz
+dhbp: lblw + wzhg
+rhdp: gznd + dpwq
+rhnd: 19
+wngh: trvs * jrdg
+rvvz: mwnj * lpvl
+mrlb: crdg + sddw
+zwfw: 7
+pzcw: ttvj * bfcb
+rvnw: 9
+chnv: 5
+wpvd: hvmp + bbsr
+vwvg: lrdm / tmdp
+hfnb: vjdv + vnwb
+jpjv: vgzz * tfll
+trnp: 11
+trwd: dzzd + ldsc
+mpzm: rwvt * scpz
+rzqz: 3
+lcjl: lgmh * frbs
+sbdp: bhmd * zdcc
+lrhl: wwnt + zcwc
+qlwp: 5
+qmsb: ffzn * fjht
+plwb: mwsz + fwbl
+qcbh: 1
+nnwb: vvql - zgdj
+dndb: 4
+mphm: mnds + rlqv
+vfdf: 11
+ngcm: smvz * ngcp
+frbb: fgqw / dvmv
+mtgr: 11
+sdqr: 3
+fnvn: nmhl * rjbv
+mpsc: 3
+jsss: 7
+jcql: bphz + fmrc
+cvdq: 15
+wwnw: 15
+jwnq: thgt * wfff
+zvjv: czcv + ngcm
+tttp: 2
+wwwt: 3
+pzwl: lfmf / pfst
+ngrt: 5
+bhgg: 3
+bvwm: mhnq + scsq
+wptn: pbcs * pdvz
+wnln: sntz * rqpr
+vwrp: 3
+qzcg: 4
+wnvr: 3
+hntj: 10
+bfjq: mdhf + ghsj
+jgcc: gths * mjmn
+fcsb: gcst + dhqt
+fplt: 3
+qbrj: frbb - zdzg
+root: tcmj + qggp
+mbpv: 3
+mlsg: 10
+lpzh: mgjl * rvfz
+scrp: sdzp / lltz
+mlss: 2
+hvvp: fgff * gzcd
+hzfp: 5
+wzhg: bppd * ffzv
+lprr: 2
+njtp: svpr / cjcp
+qjmj: lzvn * nhzm
+flvr: spdh + pdsn
+htlr: qnwh * nbgq
+dvmv: 3
+cvhv: 11
+pvfg: mqfv / nlsd
+twpr: 2
+bphz: zltg + wcmd
+mmln: hqcf / dpgs
+vwmp: wjnt * lqbw
+vgfb: 5
+shbh: hnfr + bggl
+mlhm: mzjl + lmdc
+zhzd: 8
+szng: mvmd - pdld
+fdgr: 2
+qmcs: jsjm + fzvq
+lvds: ttcv * wphv
+bmsg: 3
+npvv: njfn * ptzb
+btnj: 9
+rgrj: rtln * phlt
+dphm: 4
+trvs: 3
+gsdt: 3
+mcpd: nvhz + dljs
+pljb: 19
+ddtw: 5
+gpbn: slvh * mnsw
+ndfn: 2
+lrgp: dftn * mslz
+hqsf: 5
+hzsb: vdnq + dqfq
+rjwr: prqf * pqsl
+fqgz: 4
+zzcn: 3
+jvcn: 7
+nlnz: pfcb * zzcn
+lsbp: djcl * hsmw
+fbsf: 3
+hmlr: 5
+vwhb: jplb * zqqp
+drzq: 2
+bwfq: zrtw * dlwf
+pwvl: 6
+hwjh: cqnc * fmng
+cnhp: wqpv * ctfs
+qnwh: 3
+jlqg: pjnv + bjmr
+dblj: 4
+qmnr: 4
+rqnb: pjlw * rbgq
+qnjz: 2
+cmnr: vwrp * djzm
+vmsd: 3
+blfj: brzt + lbsm
+sgjp: tjfz * fhvg
+prvc: 3
+pwjv: 2
+dhmm: 2
+gcnf: sfwz + vhvb
+cjpr: mvtj * vgqm
+gnqj: wbgm * fglb
+tqsj: 7
+mnbr: 5
+jfcj: dfsw * pqgv
+mmcp: 9
+mfmr: 2
+llzt: 2
+vstj: 3
+qngv: dttb * rwwh
+dwzz: 4
+zssp: 2
+grwr: wrcg / pcnv
+phss: cwfd + lflg
+dqfq: nwqp + qjmj
+vsfh: zrvl * mhrc
+hdwf: zqsj - qjvn
+bgsg: zpnz + qlnh
+fjrc: jjws * wpdr
+rftn: qlpg + gmnj
+lplp: qwdh + ttdl
+lvlz: mbqm + hhsl
+gvdm: pfsq + shqj
+ztsb: jgbz * sgml
+gths: 3
+wbdj: gnfs * dpdc
+mcsm: 2
+rgsp: 2
+sgpp: 4
+crpd: gdnh * cltv
+fmlm: 7
+rdcv: 7
+mcsl: 19
+njfn: 9
+hprw: dnnz + lnpb
+dzdq: 6
+rvfz: mnzd + jtzq
+sqtr: flvr + wfqq
+hsmw: jdsv * drlv
+pzmc: ltph * qtmd
+lzvn: qzdn / vgqj
+htnr: 2
+clzg: wvjt + mcph
+qrgc: 4
+bhmd: 2
+cwsw: 3
+pltr: 4
+cggm: jjmv * vndp
+trld: lvpb + lmpz
+hwcp: jpbn + vcdj
+mwnj: ntlv + rvzq
+qtgm: lzrl - jllf
+nrpl: nsdn * bbwp
+smsc: wnln * ndqd
+scwm: 2
+gpzf: 2
+zrdv: 2
+dvsj: lgsm * tdwf
+mbqm: pgff * vjcs
+wrnv: rhrf * fmhq
+qwlz: 3
+vvgt: qwhv + tbdq
+wfqq: zddq - rftn
+rsww: 2
+bqdr: dgmb * qnvl
+mflz: ncml * rhzg
+tvgw: dtlt + mjql
+fgdd: jqts * brgv
+tbdq: psjz + tqss
+vvpf: rfjd * vzhw
+tcrs: dhbp + lmjq
+bftd: 2
+qqhw: 14
+tlsq: jrtv * qsps
+lbsm: hqsf + bpps
+rbcw: 8
+wndr: bhpl * ctvb
+cjrl: wvjv * gnjj
+qzpd: dvsj / btmr
+vfmh: 4
+jdgm: 2
+gzcd: fzzl - sqzr
+bfhv: psng * llsq
+crdg: bcvq * nbrz
+bpps: 3
+nqhd: 2
+vmzh: 3
+rdfg: 2
+gbbr: mlsg + qwsj
+qrwq: 5
+lhzp: 4
+jlgm: 15
+shws: 3
+sszv: 2
+qsps: btsd / zbdn
+gdtb: srwm * zdpw
+tjvq: 7
+scnz: ztcr * fsvn
+mdfb: 17
+vstc: rvvc * cgbr
+mmqs: cvgc + prlm
+hbmr: 4
+mtzz: 2
+jjfj: 4
+zndf: rjwg * nclb
+vpqn: 2
+dblq: tmlh * chhj
+rbnj: 2
+tmhp: plgj / fbvq
+rsrp: 2
+zcdh: cfns + btfh
+mvlr: 2
+qmwz: gbmm * fhvc
+qbqq: qmwz + cgcl
+vwns: 2
+spdh: lhsj * mjgh
+nmdm: 2
+drwj: 17
+lfsc: 4
+swlb: 6
+zcqw: drzq * jzrr
+lggh: mfmd * mmnc
+hcct: lgvw - hgtg
+gcst: zptm * cspt
+fwgl: mbpv * hdwf
+zptd: 2
+lmbc: tdtf / bspl
+mvmd: cpwl * vpmt
+fqdf: chvt - ppww
+njww: mqlf * fjps
+ghms: qzhb - dqdj
+qqwf: cmqs - wzrl
+wsmr: dggb + pcrt
+fmws: 5
+hzfl: rtdw + lddd
+pgsq: 3
+pccw: 5
+wbgm: 13
+pjsm: 2
+jmbb: 3
+bzzq: pmlb * cgrj
+fqfs: 4
+dplg: 5
+npgm: nmvh - cllb
+fpgb: 3
+djbc: 6
+jjns: vfbw + jffg
+rztj: tcgf * fgbv
+vcrc: 4
+bpbt: nlnz * hzzt
+lvww: ggwb * btnm
+dncr: 5
+tfpp: 2
+qvcg: 18
+sjwc: zjcq + thbs
+nggs: 3
+czwp: 2
+hrvc: 4
+wvqz: snds * lzpp
+htfv: pfqb * wnpp
+bqfs: hcjs + ndff
+crgt: 5
+hpqw: 4
+zcfc: rlrl * zdrw
+thzv: mhms + vcms
+rwvt: njww - nzcs
+gzqj: bqdr - ssrh
+lnpb: dqpz + fzlr
+pcqw: 4
+jmvl: plgt * vwss
+bccs: nfnf / lcpv
+fjfn: mhss + hqhs
+dtlt: mwfz * wdwh
+bbwp: 12
+clrl: 5
+dtcv: 5
+hcbb: 2
+dttb: 5
+tpzl: 3
+dmcg: 10
+cbwh: 3
+lbqb: 5
+jdqb: tmlq * djml
+fnql: 3
+mhms: 9
+rlvm: 4
+ftcz: 2
+qlpg: 1
+vjbm: mrlb * lwzs
+phtb: 3
+cqcl: 2
+lzpp: 5
+bpth: msbt * hlrm
+wzgm: 2
+ftlw: 4
+prpg: lmbc + tlsq
+hgmp: vvgt + qvcg
+fnwz: bzww * gwlh
+fndz: 4
+jdsv: qmmb * nbjm
+vhtg: qgwc * phcw
+bbgz: hmlr * mfpp
+thbs: 2
+dmhf: 3
+ccnl: ccwf * nrwl
+mdbn: 4
+thzr: 5
+rmhb: 2
+pfqb: bbcp + szpd
+zvbd: 2
+cqnc: 7
+bgnf: phss + rztj
+rjln: dpft + tjjz
+mfjd: ldwg + dbvz
+bdvs: rqmc + wjhm
+qszs: lqsz * ztlf
+prfp: 3
+pmgq: drrw * wjww
+phjf: 4
+chvt: 8
+vctd: vzwr * jnrh
+tqqd: fmtw * hpqw
+gvnc: zbwh / hgjg
+fwbl: hsst + jwjv
+vbdp: 3
+nhzm: 2
+vjdv: gbgh + lvmh
+tfbn: fgpw + wfrj
+wsjc: jdvp + zwfw
+gznd: qmsb / vjbl
+fbrq: fslz * tbpl
+nfqd: 5
+brwv: 5
+hvdl: sllr * bhcj
+pbbg: qdvm + prqv
+hqtp: 2
+vbbw: 14
+mbnn: ltdc + scwm
+qvfr: bvwm * vjtt
+lhrn: 2
+dcjh: 6
+ltcz: 2
+vcns: hssw * czvn
+qhfn: 11
+cgbb: hstf * bwcr
+dfjj: pcfd * bqpg
+ffsd: wdsv + hdzt
+lddd: 1
+mmrq: bdrd + rmnc
+ndmz: qqmc + qmcs
+bmgl: 4
+dlwf: dvtb * ffdz
+bptw: 4
+tlzv: dmfb + fphz
+fnrf: dhdf * plwb
+vtgz: 16
+qlfg: cghh * lmjf
+zdpw: pvrc + tthw
+pnqr: rgcl + gjnh
+vtfq: 16
+dnlz: gbfr + zfhb
+shsc: rpbf * tmzz
+wvjt: 3
+lsdf: dncr * mrfd
+gqgw: cjgl + szvv
+qfmz: twmh * qntf
+cfns: fhhh + vrff
+zhqr: 2
+zddc: 2
+slsh: 9
+llsq: 2
+bfrd: 3
+tnjc: hdrs * cgpz
+jmwd: zndf - mqzd
+cdwm: 10
+ctvb: 3
+sbds: 14
+nbtz: 2
+gqnj: vhtg + bcmb
+zpfd: 2
+frdq: 19
+wvhb: 3
+ptzb: 3
+qjrt: 5
+pdsn: qvcz / rsrp
+pbcp: qwzn + vfdf
+gdfr: 2
+dbnf: spdl * qtmn
+vvql: 8
+dndf: 7
+rggm: 4
+vljr: dhbz * hbqp
+rgcl: 3
+drsz: 2
+dpwq: 10
+qzjm: ltgt + dgzg
+qsmr: 5
+gzcl: rgrj / qvgf
+jrnj: 2
+ltbd: 4
+nwzv: gvnc * cbjz
+jrnr: vqdf + lzrs
+gjnh: 4
+bnvf: npnz - rmpq
+rwhv: cgbb + svrh
+jlnl: 3
+ndlv: 4
+sclj: hzfh + whpc
+prqv: 5
+snds: svjs * fphb
+lwzs: 2
+zwlf: 3
+pfsq: pmgq + tzmv
+jswl: lphp + jbvn
+twgg: 9
+whpc: 5
+mhsc: fnlj * vjts
+mrwh: 2
+pmnh: lclr + wljl
+jlrh: jtjp / hqtp
+jrvh: 2
+llpw: 2
+qzqh: htrd - pvfg
+gclb: 2
+rwwh: 11
+gbfr: htnr * gbfp
+hmhf: gmvr * lhrn
+flwb: 4
+dnnz: 2
+qgwc: qcrq * mjsq
+gmtf: 12
+jcbj: npvv + gbbt
+pcnv: 7
+jnrh: 10
+sdsj: 2
+jzgv: fbpw / zptd
+jbrj: 4
+bzww: pwjz / bpbl
+gghf: gpbn * ngrt
+bwhq: rbpv + chqt
+wsrl: 7
+btfb: 1
+tvvz: vnpw * ztlj
+tzmv: trls * btld
+tngq: cwsm * mbnn
+gcnj: 2
+zfnp: 10
+mzdh: nswn * pbcc
+bpbl: 4
+qnlz: gbzg / pvmn
+ptgr: 2
+jsjm: 6
+wnlb: 2
+scjm: zbdz * vsfj
+rjbv: 4
+mfnd: ldjp + sbsd
+drjn: 3
+mfws: 3
+ptjb: 3
+ldnf: jrnr * bmgl
+wncv: 3
+wsqc: hvvp / gbtv
+zhmg: 18
+mzrn: 3
+jcvs: 3
+hsgw: 2
+hbzc: 3
+scmv: dsfh * zfpz
+smvz: 5
+zhcb: 2
+lphp: wpvw * dsdz
+djzm: rvnw + jfcj
+fbpn: 2
+mjql: vmsd * hzsb
+tgqq: rdvs * nrjs
+bhsc: 3
+msbt: 2
+rpts: 3
+mdpw: jtsl / qrss
+dsrf: 4
+qgjm: 2
+wdsv: rlcv - wndr
+mqrz: dwzz + lhrj
+nclb: dhvt + pvvb
+gdqr: 3
+llqp: ltbd * dsrf
+qrfz: 2
+zghv: mwdw * mdfc
+lqbs: gsdq + wjqb
+hlfr: 4
+bhzz: 15
+pnsg: vmgv * bzsv
+tzgg: 4
+nbmt: 2
+pgmt: vstc + htfv
+gwjz: 2
+gbmm: 2
+gbbt: pbtd * nnlw
+jtsl: pmbg * vgdg
+fslz: 5
+hqqr: hmqq + gfqw
+gltf: qrwq + zjqg
+jdbc: 1
+mcwh: 4
+nzsm: znmp / pwvl
+ccwf: 2
+gswq: 5
+lbsq: 2
+nbjm: 2
+jpgs: 3
+mggd: qdmz * fmlm
+phbj: pvmh * wqnd
+bbnd: 2
+vrsf: 2
+msps: 9
+pvvb: hbfw * gdqg
+nbrl: dqrf + brfl
+ntlv: wwsp + mphm
+zbhh: 5
+vtfn: hmpb + jjns
+rcmg: tqsj * fnfr
+nmlf: 7
+lnzv: ddbq + fnvn
+fnbw: nssj * lqsp
+llpg: 4
+lhwh: 2
+zzhc: wrbg - qclr
+qcbn: qzgt * bmrl
+qnlc: dwff + gzvl
+qmpb: fdpv / vswv
+pqgv: zqzl + tsmj
+lgmh: dtng * hhpp
+cpwl: 3
+wjww: 3
+tgjn: vbbw + whlg
+bdqb: pbcp + humn
+cllb: 4
+fdpv: mvcl * zghv
+wwfl: wfjw + rpjv
+zrgn: 4
+dwgv: 4
+nppp: 12
+mpvd: sbdp * bfqs
+wwnt: wzzz * rqqp
+qggp: vcns * dzcq
+mnrm: hwcl * sszv
+tsmj: zclr + pswv
+phvs: 2
+rdwq: 3
+stvg: 5
+vgdg: wnvr * rndh
+thgt: 3
+bttn: brwv * mcmg
+nbdg: lzsn * qqbn
+gwjm: 4
+mvlc: 2
+hhhg: jlgm * spcp
+bhgf: vbnh * twgg
+hnfr: tnhc / qfsn
+ppbl: fjwd * rrbl
+nzvh: sdrl - rvrf
+mvjb: 7
+dhbq: sdzv * clvs
+cwsm: 3
+bwqz: 6
+nzsc: 2
+frzf: 2
+gdjg: qtbp + qhfn
+qgdn: 5
+jmsz: bmfv * fqgz
+nmpb: 3
+dhpt: 2
+mjsq: 4
+lcpv: 2
+pbsn: qwlz + zshr
+zlcw: mnrm - rpsw
+hdbv: hmps + fwgr
+jlhj: qrff * rdng
+trnt: 7
+ztlj: 4
+lwpf: 1
+cbpv: zmdn + gdtr
+zgsf: gcnj * vnss
+vjts: 2
+ssrh: vphp * ccvz
+nvhz: wvrh * qcmq
+vpzn: 4
+gmlz: 2
+gmdz: rrms + qcnz
+nrhw: 12
+ltgt: zfsv * rthf
+wpcv: 1
+bzwg: vddb + svjq
+mnjn: gsdt * pdtw
+gfpr: cbpv + hnbd
+lrjr: qnlc * pgnc
+lsnz: 4
+zjlv: twwt * prfp
+dggb: gmlz * vrbc
+fnfr: 9
+czrj: hqrh * gwjm
+vjcs: 3
+tpzq: 6
+msbc: gmjc * rzqz
+pfcb: 3
+vfdg: mqbm + hhsz
+plgj: znhn * dvlj
+fpfv: cgbs * rlfp
+fmnc: 2
+drrf: 3
+spdl: 11
+lghs: lchp + qszs
+shfj: mzzq + chnv
+mhbf: ndmz + fpfv
+cwrd: 4
+fpbr: ztsb / tttp
+mwhz: vqmq + wvts
+mhrn: 2
+fgff: 2
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+frfr: 3
+wzrq: 3
+wdwr: 2
+gjmw: rmtj + hlsc
+dzcq: rrgf + tngq
+fhhh: 1
+bmfv: 8
+dljw: 17
+slvh: 5
+wjhm: 4
+rbdj: lqpq + drsz
+fmhq: 4
+bzml: 5
+fhfj: hhhg + bgsg
+zpdh: 3
+mrhf: 5
+svjs: 2
+tjjz: cjfs * qmpz
+bwtn: ssjf + dmhf
+hgtg: hvbj + nljv
+jwqc: njgp + zcbm
+qrjz: 2
+cbjz: 2
+tjfz: szwd + zrss
+shtz: fnwz + qdhm
+bcmb: qrqh * lrvz
+wpnr: nbvt * jcql
+lllb: gvdm * tqnh
+gvms: zvbt + zqmj
+srnw: 4
+dhdf: ztmg - prdq
+cfsl: 6
+gwlh: 5
+fwvt: 4
+pmbg: 2
+snwl: pmvr / mfmr
+bpdn: mcmj + lcjl
+prdq: 2
+gbnn: 4
+zdzg: 1
+tmfc: vrtw + thsd
+wjnt: 3
+shhw: 3
+ljsw: wcjj * pltv
+hqrh: 4
+npnz: lwzp - nqdt
+zlfm: rdwq * jbrj
+dtzf: 4
+bppd: 3
+dtvd: 3
+vcnz: rcdb + fzdf
+qtrn: jlrt * lqbs
+ppzw: trnp * zssp
+bdnp: 3
+zdrw: 3
+brwq: 3
+tpjj: drbq + swlb
+wdmv: 3
+zmdn: 3
+ttbm: 5
+bfjs: 2
+pfdm: 5
+vpvr: vbdp * ndfn
+gzsw: qpqz * nzgv
+mfpp: 5
+qnlh: bwtn - qmbm
+fnlj: rmhb * cngh
+mmhf: jgrp / mvbd
+mdqw: 4
+dhcp: zrgr + frqd
+rcjm: pprt * ddds
+wrjq: vbdw * cldq
+bdws: 5
+tgjq: jrnj * bbgz
+btld: 5
+rbst: 6
+swqf: 2
+mvql: 2
+zpls: 4
+rdhb: 2
+wcvl: 3
+zddq: pfdm * frsr
+vvqr: 4
+hbns: 5
+mmnc: 2
+qprl: wpnp * wwwt
+brjz: 13
+gqsw: 10
+cvzp: ljbp + swdz
+wvrh: 14
+rthf: 5
+jjjr: nzts * mvql
+wmlg: thlc * rwtg
+jrdg: dbnf + btmz
+mlrp: hrjg * sdsj
+cjgl: gfpr - zbhh
+cgtp: ldnf + wmzl
+vtvg: qdpz * nfsr
+hmps: zpdh * wncv
+wvzv: 2
+rtql: 1
+pjlj: ddtw * lhlc
+shbp: 7
+nbvt: 5
+vtwm: 19
+llrm: 5
+ngmv: shbp * whds
+wtdw: 11
+ccvz: 11
+wtlb: dzfw * bmvr
+nclh: smwf * zqdq
+sfqw: 4
+zpqs: 5
+ddbs: 12
+dpft: flsr / mcsm
+jrtv: lzfw + vpqn
+dzcl: vqgl * wcnt
+ncml: 5
+zvmw: frzf * vtfn
+qftv: ptvm * rlvm
+wnjg: zfqf * vpzn
+qvcz: cjzc * gmtf
+jfzt: 1
+mjjf: 2
+hsst: wdmv * vjmz
+ljcm: 4
+rgbz: 2
+lmft: 9
+qtmn: 2
+wsdr: lhcs + mmmz
+plgt: tldh + lchd
+wvjv: 3
+dljs: 11
+nljv: wpcv + nsmd
+pgnc: swqf * fpbr
+zjqg: fctb + bzmg
+vdnq: tmwd + ppdm
+lhjd: 4
+jsdv: 2
+vqll: pzcw * bjts
+hztf: 2
+mqlf: 5
+mrsr: szbv + zcdh
+dnrb: ptjb + tgjn
+fjcf: shtz + mhcj
+nhcp: 8
+cjfs: 12
+wdwh: hrqt * prws
+mglh: 17
+thds: gjwj * tmrv
+scgv: nhfp * hzfl
+mhdq: 2
+ndqd: cvdq + wcrb
+qfwm: zgsf / llzt
+vqpz: lsmr * qwnt
+gsrq: fcgc * bwwv
+gmvr: 12
+hgdj: brjz + tmhp
+qqmc: qnlz * vqnh
+pprt: 2
+zwhb: nbvf * vbsr
+szwd: qgjm * ggqd
+dtng: 9
+nmvh: 17
+nthd: wsdr * jcwv
+lmjq: 6
+nrfn: bpbt * jpgs
+hlrm: 7
+rlfp: zgrj + jcvs
+pmll: 3
+jrrv: wbpr + ppqs
+plfc: 13
+jqfl: 2
+ztql: 2
+bfvq: lhjv / jwrd
+gqch: 2
+sbsd: rtjv * nngb
+cgps: jdgm * dnlz
+dqqh: phjf * tpjj
+cbrg: 2
+gdtr: qmnr * fqfs
+zvzs: 16
+gndt: 3
+zbdn: 2
+vbhb: 2
+swdz: qjrt * zghj
+rfjd: 5
+dsjh: gqnj * clzg
+cjcd: nfrb + gwgq
+mtnh: mqcw * nwzv
+cgrj: 13
+fgpw: nrhw + wzvq
+chst: svbs + cbqw
+fglb: 5
+prqf: 2
+rrbl: 2
+hbfw: dsjh - bpdf
+fvcb: vlgh * qvsw
+jgvj: ttrc * jmsz
+sbmw: rbmp * twpr
+qgcp: jlhj - gzqj
+ztmg: gswq + trld
+nmhl: hnhl + dfmf
+ppdm: pdsq * wnjg
+hqpc: qhtc / pqtr
+jfhp: hqfz * nmpb
+jpbn: rbpp - llqp
+qdpz: 2
+vzwr: 12
+gbzg: 14
+lqpz: 2
+wfrj: cnzt * tmwn
+tsvp: ssdv * cvhv
+vjnj: 1
+tprs: 5
+bjpj: 3
+wfhr: 5
+tsbf: 7
+dqpz: qzpd + lsgd
+smwf: 14
+vnss: hzlp * wrsd
+srwm: 3
+qgrp: 5
+lwzp: nhcp * jqvm
+chfh: tpgd * wqdv
+brgv: 3
+ztlf: 7
+vbfg: tgfh * nlln
+bqqz: ncjj * fwvt
+hpsj: 2
+gcgv: 9
+dmfb: drjn + lsbp
+jllf: 18
+zqsj: mfws * bgjh
+vlvf: dmcg * wdgd
+ndff: 4
+pbtd: 2
+tmlh: 2
+bbvr: ppzw + cwpz
+sjtg: znmt + lvlz
+tmwd: fwnb - zvmw
+wqpv: 2
+zrss: 9
+twmh: 2
+ptlm: jbsh * zgqq
+sqts: 3
+zzrp: 3
+bmvr: 9
+fphz: 13
+vnmb: 3
+zntd: jzgv - lrjr
+rdvs: 2
+zrtw: 3
+vhwj: 3
+qrss: 2
+jsfg: wljt - tmwm
+qqbn: 14
+ffmg: 7
+zfqf: lprr + gmtm
+drbq: 5
+smsz: 2
+fjvm: jsbl + fswh
+ctgr: 3
+qwhv: lfnh * mtzz
+zptm: 3
+sddw: ljsw + ljgj
+jlrj: qgvl + mnbp
+dmjl: 5
+bgnb: 2
+rdng: 9
+blwg: 4
+dzpc: zjtr * gmmg
+gmnj: 6
+sfrd: vfqn + pvqb
+lbmr: rmvr * szcq
+gdmm: 2
+dwff: 3
+sbsc: 6
+jjws: 2
+fzmg: 6
+hpgp: 2
+gjwj: 5
+hqhp: mmln + ztth
+pcnh: 13
+blrb: zpfd * pjlj
+wrsd: wptn / lvqr
+lfnv: 5
+lhrh: zglv / wzrq
+spvn: 12
+mhnq: fngh * jlnl
+pcfd: 2
+lsgd: hphl * sqpl
+fqdw: 5
+cbqw: 19
+nqdt: 2
+rhrf: zzhc + chfh
+sgml: tfln + spwh
+tsgd: npgm * plfc
+vdfg: zmgz - vlnz
+rmbh: 2
+nqwn: 2
+zjlg: 11
+hmqq: mlss * lsnf
+nnlw: 5
+whhp: hfns + dwlh
+rbgq: ddbs + qbqq
+czvn: 3
+qmbm: cwmb + fjrc
+hqfz: 19
+tmdp: 2
+smbz: qwtg + lghs
+lhcs: wmhr * dgzj
+drbh: 18
+sppw: mvlr * vsss
+prlm: rrcd + bqqz
+whfr: rcpv + qmpb
+pdtw: 4
+hrqt: hcph / bdnp
+lgjs: ltcz * jlqg
+rpjv: zhmg * mfjd
+lgvq: pbmh + rtqj
+djml: lhzg * lbsq
+mnds: ftjl + plrv
+rgmd: 6
+mqcw: czwp * jcsp
+vwvd: lcbb + vjnj
+qtmd: 3
+wwsp: zwcj + wjff
+jvtg: pmll * dtvd
+hwcl: fvcb + hcct
+znhn: 6
+tqnh: 2
+btmr: 3
+bpbh: 12
+tcgf: 2
+lzrl: qgph * nnwb
+qbht: nsfl * cwsw
+hzdf: 2
+bbjz: wfpl * twtr
+bqrr: 13
+qhtc: dzdq * jdcs
+cndw: wjts * nvdh
+dtgs: pprm + pccw
+nnqn: bfjs * qghp
+nsmd: jtdm * pwfc
+vlvr: gdjg - vdwb
+rqpr: 5
+hqhs: cncw * jcfw
+hqfh: 3
+btnn: qnlh / ljtl
+rbpv: 16
+rsrs: bbjz + bpdn
+gdzq: drwj * snhf
+jmrd: 3
+chhj: 17
+brfl: nstv * qprl
+tlft: pcsw * czrj
+shqj: sjgr * zgvp
+bspf: 2
+qntf: twnc + frnf
+fcmm: 9
+pjnv: bptw * sfqw
+pwjz: dblj * whhp
+jcpv: prmq * dwgv
+clwd: ftlw * frfp
+gfrz: 3
+vsss: 19
+pfrb: rjfd * mtgr
+tdtf: rscv + rvzm
+mmjw: tnjz + mnzt
+lvpb: 3
+wcrb: shps * rmbh
+cqbc: 2
+bfcb: 3
+lfnh: mlrp + sbmj
+dgmb: pltr + bqdj
+pfst: 3
+pprm: rrhp * nqmf
+zhmb: dthg / mcwh
+vqqb: bftd * vdfg
+nnjp: mbrh + qdnr
+lcdv: sqtr * tsvl
+nrwl: 3
+ptnt: 3
+trls: 17
+zdhd: tpzl * zdcs
+lmjf: 3
+cmmc: bhsc * fhfj
+gwqg: 2
+rbmp: 17
+nbrz: 3
+cnzt: 14
+mmwv: bzwg + nrpl
+hnbl: 16
+mslz: 5
+dqrf: cqsh + rcmg
+vfcw: 3
+tsvl: pvqc + hbns
+jczn: dplg * nzsm
+rrgf: rggq * nlcp
+jvtp: sjtg * jbrf
+tfll: dwsz + sdqr
+mvcl: zhlp * ntcg
+wmzl: zntd * gqcj
+ddnw: sdzj * dhmm
+qdhm: pgwj - lzzg
+vhvb: 5
+phnr: 9
+zshr: psdc * cnsg
+stpw: 5
+szpd: jbfc + rgmd
+lbvm: 3
+swzw: rwhz * crpt
+ffvb: zrdv * wdbw
+ltdc: pzwl * cbwh
+zmdj: qrfz * msbc
+hzfh: 2
+dfmf: 4
+qdnr: 6
+rlpp: gndt * rsww
+rtdw: gmdz - wcvl
+hmpb: hntj * jvtg
+gzvl: 4
+gfbm: 2
+sntz: 5
+qwqz: 3
+rwrz: 3
+mqfv: whqj * mmhf
+ltrc: cmmc + wvqz
+jftb: 9
+bfqs: tqqd + lmft
+lcbb: 6
+wvjq: 2
+ndsw: 14
+nbgq: 2
+blrj: hhgs / brqt
+hhjq: rcfv * djbc
+rtqj: ffwr + fclm
+wbbj: dzbt + zcfc
+rscv: bblp * fpgb
+fphb: 5
+dhrv: mlhm * frlb
+ccfn: 2
+vgzz: 5
+cqsh: rqnb + zpfc
+gdpf: 12
+rvrw: 2
+fmtw: hbmr + ptnt
+bdrh: 3
+pvqb: mctz * fsfn
+lrgg: 9
+cnqp: vnmb * fbpn
+tvsv: zfnp + cdrn
+qzhb: nmjg * jqfl
+tzbg: 2
+wpdr: 3
+gmsl: 6
+grgl: jcpv - jpfj
+wvts: splw + vrpg
+wdgd: 4
+pvrh: 8
+vlgh: 5
+dlmq: bfhv + lldp
+tsjw: 4
+hfwj: 4
+ddqs: mdqw * mrhf
+wbdm: 2
+rtjv: 2
+mwfz: qrzz + jqpb
+vcsz: 2
+bblp: wgbg - qqcj
+jlrt: mnbr * vmzh
+rdqq: 1
+zlgb: 18
+dzgh: 5
+slqd: gqgw * fjhh
+lmdc: mlbh * grwr
+mrfd: spvn + fwwc
+mhss: lqmm + njvr
+rdnd: jswl + bpng
+dvjh: hfnb * zzrt
+pbcs: lcdv / zddt
+ntdn: 4
+nvjn: dmjl * qgrp
+tzrs: shrd * vwfh
+zdcc: 4
+dzzd: ldjv - vjbm
+trtr: dljw * zlgb
+btmz: cghr - bpbh
+bqqw: ptsp + zlqh
+bgcv: dqqh / smlz
+lfhd: 2
+mgjl: 5
+llrp: lggh + fwgl
+zfpz: 7
+htvc: 2
+fjht: 2
+lqsp: 3
+sjjm: tvsv * sbpv
+sfwz: 12
+mtsj: slsh - pwjv
+nzcs: 2
+hdzt: pgnh * tqmz
+lhlc: 5
+wvrb: 9
+bnwm: 3
+nmgq: lhrh * cjpr
+wprb: 6
+qmbs: 4
+dfvh: zlfm + swqb
+zpbm: hgcb + mqrz
+ffvt: 5
+frfp: 8
+ljgj: dzcl * whvl
+nncw: 8
+dnvl: ndsw + gcnf
+gggh: 2
+glmz: 15
+dhqt: 4
+rtjh: wfgb + qstr
+jgbz: 2
+ldsl: fbsf * shws
+vfbw: llrm * sppw
+pmfw: wqgv + nvjn
+wcpl: 19
+vdwb: bfbb * fdgr
+cwfd: 1
+rbwf: 2
+svjq: 8
+dzbt: 7
+vgqm: 14
+hwnz: 5
+vdvw: 3
+vqvw: 5
+lmfr: 2
+qvgf: 2
+mljg: 3
+hhpp: 3
+cmqs: cgtp / wzgm
+jwmp: rbbv * tzgg
+cjzc: rdcv * zsjg
+fbvq: 2
+vjmz: 4
+bwwv: 3
+cvgc: 1
+rfdl: 3
+mvbd: 8
+pjlw: 3
+bszp: 5
+scds: 5
+jcsp: 4
+mcph: 4
+wzrn: rjbw + jwmp
+pznn: 3
+ghrb: trnz + fmzq
+bdrd: pnqr * hsbl
+zstc: 3
+mbrh: vwhb - rgsm
+fjns: tdjh + mncz
+vjrn: cslb + qcws
+shps: 11
+glfb: 20
+cgpz: 7
+dftn: 5
+rjhn: 5
+tnjz: jfnw * mvlc
+dsfh: 3
+tsfs: 3
+zpfc: tcfd * vljr
+jcvc: rjln * qqhp
+hgmj: 3
+tqcc: ctlw - jlrj
+mqzd: swzw + vdjb
+fzdf: tpwj * mtsj
+hsgm: crgt * qzqh
diff --git a/src/bin/2022/day21.rs b/src/bin/2022/day21.rs
new file mode 100644
index 0000000..dec8b5a
--- /dev/null
+++ b/src/bin/2022/day21.rs
@@ -0,0 +1,227 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+use advent_of_code::prelude::*;
+
+#[derive(Clone)]
+pub enum Monkey {
+    Num(i64),
+    Add(String, String),
+    Sub(String, String),
+    Mul(String, String),
+    Div(String, String),
+    Human,
+}
+
+pub struct NamedMonkey(String, Monkey);
+
+impl std::str::FromStr for NamedMonkey {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let cap = regex_captures!(r"^(\w+): (\d+|\w+ [+*/-] \w+)$", s)
+            .ok_or_else(|| anyhow!("failed to parse"))?;
+        let name = cap[1].to_string();
+        if let Ok(n) = cap[2].parse::<i64>() {
+            Ok(NamedMonkey(name, Monkey::Num(n)))
+        } else {
+            let mut parts = cap[2].split_whitespace();
+            let monkey1 = parts.next().unwrap();
+            let op = parts.next().unwrap();
+            let monkey2 = parts.next().unwrap();
+            match op {
+                "+" => Ok(NamedMonkey(
+                    name,
+                    Monkey::Add(monkey1.to_string(), monkey2.to_string()),
+                )),
+                "-" => Ok(NamedMonkey(
+                    name,
+                    Monkey::Sub(monkey1.to_string(), monkey2.to_string()),
+                )),
+                "*" => Ok(NamedMonkey(
+                    name,
+                    Monkey::Mul(monkey1.to_string(), monkey2.to_string()),
+                )),
+                "/" => Ok(NamedMonkey(
+                    name,
+                    Monkey::Div(monkey1.to_string(), monkey2.to_string()),
+                )),
+                _ => unreachable!(),
+            }
+        }
+    }
+}
+
+impl Monkey {
+    fn eval(&self, monkeys: &HashMap<String, Monkey>) -> Option<i64> {
+        match self {
+            Self::Num(n) => Some(*n),
+            Self::Add(n, m) => {
+                monkeys.get(n).unwrap().eval(monkeys).and_then(|n| {
+                    monkeys.get(m).unwrap().eval(monkeys).map(|m| n + m)
+                })
+            }
+            Self::Sub(n, m) => {
+                monkeys.get(n).unwrap().eval(monkeys).and_then(|n| {
+                    monkeys.get(m).unwrap().eval(monkeys).map(|m| n - m)
+                })
+            }
+            Self::Mul(n, m) => {
+                monkeys.get(n).unwrap().eval(monkeys).and_then(|n| {
+                    monkeys.get(m).unwrap().eval(monkeys).map(|m| n * m)
+                })
+            }
+            Self::Div(n, m) => {
+                monkeys.get(n).unwrap().eval(monkeys).and_then(|n| {
+                    monkeys.get(m).unwrap().eval(monkeys).map(|m| n / m)
+                })
+            }
+            Self::Human => None,
+        }
+    }
+
+    fn is_num(&self) -> bool {
+        matches!(self, Monkey::Num(_))
+    }
+
+    fn invert(&self, monkeys: &HashMap<String, Monkey>, mut val: i64) -> i64 {
+        let mut monkey = self;
+        loop {
+            match monkey {
+                Monkey::Num(n) => panic!("found num?"),
+                Monkey::Add(n, m) => {
+                    let monkey1 = monkeys.get(n).unwrap();
+                    let monkey2 = monkeys.get(m).unwrap();
+                    if let Monkey::Num(n) = monkey1 {
+                        monkey = monkey2;
+                        val -= n;
+                    } else if let Monkey::Num(n) = monkey2 {
+                        monkey = monkey1;
+                        val -= n;
+                    } else {
+                        panic!("not simplified?");
+                    }
+                }
+                Monkey::Sub(n, m) => {
+                    let monkey1 = monkeys.get(n).unwrap();
+                    let monkey2 = monkeys.get(m).unwrap();
+                    if let Monkey::Num(n) = monkey1 {
+                        monkey = monkey2;
+                        val = n - val;
+                    } else if let Monkey::Num(n) = monkey2 {
+                        monkey = monkey1;
+                        val += n;
+                    } else {
+                        panic!("not simplified?");
+                    }
+                }
+                Monkey::Mul(n, m) => {
+                    let monkey1 = monkeys.get(n).unwrap();
+                    let monkey2 = monkeys.get(m).unwrap();
+                    if let Monkey::Num(n) = monkey1 {
+                        monkey = monkey2;
+                        val /= n;
+                    } else if let Monkey::Num(n) = monkey2 {
+                        monkey = monkey1;
+                        val /= n;
+                    } else {
+                        panic!("not simplified?");
+                    }
+                }
+                Monkey::Div(n, m) => {
+                    let monkey1 = monkeys.get(n).unwrap();
+                    let monkey2 = monkeys.get(m).unwrap();
+                    if let Monkey::Num(n) = monkey1 {
+                        monkey = monkey2;
+                        val = n / val;
+                    } else if let Monkey::Num(n) = monkey2 {
+                        monkey = monkey1;
+                        val *= n;
+                    } else {
+                        panic!("not simplified?");
+                    }
+                }
+                Monkey::Human => return val,
+            }
+        }
+    }
+}
+
+pub fn parse(fh: File) -> Result<HashMap<String, Monkey>> {
+    Ok(parse::lines(fh)
+        .map(|NamedMonkey(name, monkey)| (name, monkey))
+        .collect())
+}
+
+pub fn part1(monkeys: HashMap<String, Monkey>) -> Result<i64> {
+    Ok(monkeys
+        .get("root")
+        .ok_or_else(|| anyhow!("couldn't find root"))?
+        .eval(&monkeys)
+        .unwrap())
+}
+
+pub fn part2(mut monkeys: HashMap<String, Monkey>) -> Result<i64> {
+    monkeys.insert("humn".to_string(), Monkey::Human);
+    simplify(&mut monkeys);
+    let root = monkeys
+        .get("root")
+        .ok_or_else(|| anyhow!("couldn't find root"))?;
+    let (monkey1, monkey2) = match root {
+        Monkey::Add(n, m) => {
+            (monkeys.get(n).unwrap(), monkeys.get(m).unwrap())
+        }
+        Monkey::Sub(n, m) => {
+            (monkeys.get(n).unwrap(), monkeys.get(m).unwrap())
+        }
+        Monkey::Mul(n, m) => {
+            (monkeys.get(n).unwrap(), monkeys.get(m).unwrap())
+        }
+        Monkey::Div(n, m) => {
+            (monkeys.get(n).unwrap(), monkeys.get(m).unwrap())
+        }
+        _ => panic!("wrong root"),
+    };
+    let (val, monkey_human) = if let Monkey::Num(n) = monkey1 {
+        assert!(!matches!(monkey2, Monkey::Num(_)));
+        (n, monkey2)
+    } else if let Monkey::Num(n) = monkey2 {
+        assert!(!matches!(monkey1, Monkey::Num(_)));
+        (n, monkey1)
+    } else {
+        panic!("wrong monkeys")
+    };
+    Ok(monkey_human.invert(&monkeys, *val))
+}
+
+fn simplify(monkeys: &mut HashMap<String, Monkey>) {
+    loop {
+        let mut found = None;
+        for (name, monkey) in monkeys.iter() {
+            if matches!(monkey, Monkey::Num(_) | Monkey::Human) {
+                continue;
+            }
+            if let Some(n) = monkey.eval(monkeys) {
+                found = Some((name.to_string(), n));
+                break;
+            }
+        }
+        if let Some((name, n)) = found {
+            *monkeys.get_mut(&name).unwrap() = Monkey::Num(n);
+        } else {
+            break;
+        }
+    }
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        part1(parse(parse::data(2022, 21).unwrap()).unwrap()).unwrap(),
+        10037517593724
+    );
+    assert_eq!(
+        part2(parse(parse::data(2022, 21).unwrap()).unwrap()).unwrap(),
+        3272260914328
+    );
+}
diff --git a/src/bin/2022/main.rs b/src/bin/2022/main.rs
index d13e807..25e7c34 100644
--- a/src/bin/2022/main.rs
+++ b/src/bin/2022/main.rs
@@ -31,6 +31,7 @@ mod day17;
 mod day18;
 mod day19;
 mod day20;
+mod day21;
 // NEXT MOD
 
 #[paw::main]
@@ -57,6 +58,7 @@ fn main(opt: Opt) -> Result<()> {
         18 => advent_of_code::day!(2022, opt.day, opt.puzzle, day18),
         19 => advent_of_code::day!(2022, opt.day, opt.puzzle, day19),
         20 => advent_of_code::day!(2022, opt.day, opt.puzzle, day20),
+        21 => advent_of_code::day!(2022, opt.day, opt.puzzle, day21),
         // NEXT PART
         _ => panic!("unknown day {}", opt.day),
     }
-- 
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