From 15c44c1f6ac6073b29934ffe2270ed15b65dcaa3 Mon Sep 17 00:00:00 2001
From: Ben Ashton <ben@n0m.org>
Date: Fri, 30 Dec 2022 15:38:44 -0700
Subject: [PATCH] Day 21

---
 21/input        | 2755 +++++++++++++++++++++++++++++++++++++++++++++++
 21/solution.mjs |  139 +++
 2 files changed, 2894 insertions(+)
 create mode 100644 21/input
 create mode 100644 21/solution.mjs

diff --git a/21/input b/21/input
new file mode 100644
index 0000000..2c1b1da
--- /dev/null
+++ b/21/input
@@ -0,0 +1,2755 @@
+swbs: bwzr * swcj
+dsch: rvqh + fwvg
+nlbr: 2
+drtz: btpb + lngc
+nwff: vqlw + lsdd
+zjzw: lbtj * whgf
+rndt: tnjv - dtdg
+hjjz: nrhq + dbss
+tfng: 3
+fjtw: nmvr + qmrl
+dbwj: mplc + vbpc
+gwgp: vljt + qnsw
+djwh: 2
+mlbf: tzch / cqdv
+stcz: 2
+gzrw: hwfp * fbrg
+qjgp: 3
+pgzl: 2
+ltzh: ftwz + cwjt
+wwnp: 4
+bthj: 4
+bmcq: grmh * lhbs
+ltvb: gslf / pndc
+rgfc: lwrs + jwsn
+ljwn: 2
+pqrd: tglb - rrbw
+jhzr: 6
+fbfd: pqrd + gfhw
+ccqt: 10
+vwgm: 8
+jmtf: 20
+pwhn: 6
+wrcl: 3
+qmmf: ztqj * rtsc
+mwgc: ftnz + mlsj
+rjvc: 2
+nmzw: 2
+wqgg: 4
+zqzn: mhvn * jwzq
+pjzp: qpfv - bdjw
+cvdl: 4
+rvhc: 2
+tfzp: 10
+nmcd: qpln + bzbq
+dpjh: rjfb / pgzl
+cnvf: cqln + qrbb
+dgwj: ptsl + pfnm
+nvwt: 1
+nvqw: 2
+hmld: 2
+jsvm: 2
+qpgb: 2
+rhhm: 15
+bqmg: vbcn * dwcd
+btrv: ldrw + mwrh
+snbz: pfrf * smqm
+zrvw: zhcg * vmgw
+bjdt: 2
+ffdf: 6
+vwrh: spvc + rwcp
+rmfv: 8
+hhpb: 4
+jtzp: 20
+hclm: 5
+vwzs: mhcg + ltvb
+mrdd: 4
+rmwc: lqdh + vwgp
+vsqj: mmwv + wcgb
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+lmfv: 9
+dhfl: 18
+lchr: mdtn * vrsg
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+fvbn: 5
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+vlpd: 2
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+qpjd: 5
+nnvz: wnzd / qpmq
+pqpw: vprc * fhld
+qthr: rllp + zszw
+jftf: qjcb - vmsb
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+qpgf: lcdc + mwwd
+mplt: 19
+prpm: lhhm + jnrl
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+pndh: srvp + svvr
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+qpmq: 2
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+bfvt: 2
+qbzj: cjvp + dlwc
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+mcrj: 6
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+gnsz: ntmg * gbmr
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+mggm: 2
+hbvb: smwg + rbjc
+vljj: jgjc * qdcs
+qmsf: rwwf + bccn
+ghds: hsfv + tmcb
+pbzg: 9
+nsgb: 2
+sgdp: tfhz * vdqh
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+bgcz: 15
+bnzp: 4
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+gnsl: qcpd * qpzn
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+qcpd: 4
+mpcq: vlcd - gsfz
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+gcsv: hqhw * nbrf
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+tgpt: 5
+fngj: 4
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+jrll: gvrv + snng
+gtfn: tpcs * chhr
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+zrmn: 6
+flvd: zrrm + bvlg
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+lvrp: 6
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+mtcq: 3
+wnzd: crhd + nqfh
+gnbw: 10
+nvzb: 2
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+swcj: 3
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+lzpb: 4
+ztct: hdhb + sbbz
+pjtn: 10
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+tmcd: rcdc + cqwz
+nlht: drwv * ljst
+mbpl: 2
+twdm: gcls + qplm
+mntp: 2
+ppjh: ljhz * qlzh
+zjtp: 11
+sgww: ldzr * rclr
+vsjb: 4
+hsdf: 14
+thhb: 7
+whvc: sgcz + nsgb
+dhfw: wcqf + qltp
+wdjw: dbdj * drsj
+bntf: 11
+lpgr: mpfl * ghds
+pbqj: 1
+mhdw: 2
+zsdn: ncqz - rbmg
+znht: snbg * vwtf
+wgmc: 4
+fbhh: ghdb / nfdc
+gncc: 2
+nmfp: 2
+djbd: 6
+bfgs: bnbj - pbmr
+qbsm: wtcm + pnnc
+rmct: czst / stpp
+dpnz: wtvt * hfrj
+vwmc: vhbb * rqcl
+mlmh: 4
+npjg: gvcr * tznz
+cfbh: ddvd / sqlc
+vjpl: vbvh + dzcq
+mrgg: nlfw * zvgf
+zbqd: 17
+frhf: wpgn / fmcd
+dpzp: pqdg * zqff
+nlfj: 2
+gwrm: jwqm + qgwj
+zpmq: rqnb + mvhf
+brqb: 2
+vwjs: 11
+lmwl: 3
+tqwq: rnjv * rjsr
+fllm: ftzb * ctqp
+rrnn: 2
+zhgg: dpzp / gszj
+wtcm: nrrp + rtgq
+mmzq: 13
+phlb: 3
+mmrw: jfpp + nwnv
+lwrs: tpml * wvmt
+twcq: ffpz / nqpg
+gslf: 12
+rrmp: qfvq * bpzp
+cbfs: bsjc + dhjf
+llhb: 5
+svrs: 2
+fbvh: 5
+nlpc: jmfv - dlhc
+hsfv: phjz * ntsg
+zzqv: 2
+tclq: fsdw * twcq
+gssg: trtg / svjf
+lhzp: 2
+rvdr: mdbc * bfhw
+rrjh: 2
+ftqc: scsc * fcjj
+pdtl: jrll + crfl
+wjlf: 3
+stlp: 3
+fmhm: bqhc * tjrc
+djsw: slrc - pqdf
+gvpb: 3
+bzzz: bfmm + whnw
+fjcd: fpsr * vdgr
+wntf: 3
+vtnq: 3
+lcns: 2
+wmrq: 7
+wvcw: 17
+hwzz: 12
+snjm: hpgg * wqld
+tmcb: jmvq * qwqt
+zztn: wtlc * jmlb
+bsqb: npjf * gpvf
+wtcf: qtnm - qdgd
+zjmr: hrvc + mnbl
+gbwp: nsvz * zwsw
+mqsp: 7
+tvwp: 3
+vcmd: rhph + hwzz
+ngjl: 19
+nwvp: qmdl * stpz
+rnjv: 3
+hnlr: zqnw - shnp
+jbzl: prpm * bmvv
+gwjs: rfth - szzp
+wpgn: gvgp * zmnp
+zbnt: tgpd + cnhz
+bjpg: qwhh * wbdw
+hlrd: bpgv + trhb
+mgwh: 5
+ccdz: 5
+pssr: 2
+cllr: bhct - vjcv
+tgpd: rvmw * zdll
+cmrw: 1
+ghsw: 3
+hvqm: qglh + nhcw
+lmzl: cvmw + rbtf
+tdlb: gstw + mcsw
+lssf: 5
+jwsn: 11
+wtqg: 2
+brmb: cbcr - gqsw
+hcpn: 2
+cjrg: 3
+zbdv: lrbp + rsmp
+pzfr: zflq + tnsb
+ndbd: srzf + fzjp
+ztgp: 2
+vfbj: 5
+nggm: 5
+ftwz: 6
+jhlw: szct * wgjs
+snrm: mqpv + flwr
+bhjq: 2
+tgdh: 2
+qpqw: 8
+wtlc: 3
+hqbc: qrjb + zpmq
+ttgb: tzcv / zqwc
+pnlm: 7
+jznz: vsnq * nhcf
+mltm: 2
+fljz: 4
+gvml: prjh + dcds
+jzvn: 2
+bsvn: 9
+pznl: rdtb + vccz
+cwwq: 4
+rvqj: 3
+zfmh: vvcd * zmhj
+wltq: 5
+trds: 4
+bwnj: 8
+dzfw: 10
+gggv: 3
+tmnt: lgmd * qbhd
+hpmg: 3
+zfbf: 15
+lvng: 2
+wwhh: bhgw * fccs
+bdrq: rbgm * rndt
+sgjq: gbsj * gcnm
+wdvz: tqpv + cjdc
+trtv: cvbt + ssst
+dsqq: stcm * pdhr
+pfvw: sqph * btrv
+vzgc: 4
+qbrs: fjgm / hwdg
+jjdw: 2
+clfv: qwst * qpqt
+qgfb: 2
+flrd: 11
+dhzz: tfwp / grpd
+trqt: 5
+svdm: jmzf * ndsc
+dmbm: nvgt - tvtf
+pqtb: njlz + cdlr
+zlzc: 7
+vlcd: pghw / bjdt
+tqfv: 7
+lqvd: nlhj * zttm
+lngc: qtzv / hllr
+qhbm: fvgc * mjlv
+gpbf: 4
+jdzv: csdp + cfwt
+vsmg: psqs * bcdw
+ngcc: 3
+vqzq: lwgn + cnpg
+zdlv: 2
+nphd: 19
+wwwf: 15
+ftpc: 4
+glwc: snfr + fmpv
+tqpv: 8
+crgw: 2
+vsmv: mnsh + vsbn
+pqbq: 2
+ctbm: 12
+fgmb: fjjn * tcnw
+dbdl: 10
+lfmv: grfl + mbml
+pbpg: 4
+lrrt: 5
+zhcg: 3
+bqhc: rzcw * qjwl
+bmzh: jpcv + lcbt
+bbsm: vlgr + vjnj
+ncqz: pnqb * fcdr
+jzfs: tlvz * nhqz
+qrlv: 6
+tzbm: hdfj + mtjt
+hdvb: 2
+sfgd: 3
+vwmv: jnqw * cjzz
+fpzf: 3
+ntcr: njgb * lnbm
+fccs: 12
+frsc: gwbc + qjms
+fcqz: nvfc / rjvc
+ptct: dczq - fjht
+qsph: 17
+dmpm: 3
+szvw: bdpl * sqvh
+vscg: 2
+fppn: hzzb * bphn
+wpfr: 9
+wwcj: 2
+nttd: 11
+mtnz: qwvl * pmsd
+rmsr: 4
+czbg: 2
+qbgw: 3
+bflt: 2
+mmwv: cwsb * ljsm
+ndwc: tbgw - fjcz
+lpnd: 3
+qsfb: vwgm + ftdf
+smvw: 12
+mjsl: 2
+mpfl: 2
+sjsf: 11
+zmhj: 2
+sjqp: hbqg * nwmm
+vcnm: 5
+wwlr: clfv + hvts
+trjt: gvpb + zjdm
+qslz: 5
+qjms: 17
+zjdm: 8
+qtgg: 19
+cjvp: 4
+mfrs: qnmz * bbsm
+gltp: 13
+qhlt: rbzd * hrgq
+npmd: clzs + vpcr
+vwqz: ngcc + jghj
+bqjf: 3
+bdps: dtmp / vfvg
+qjrd: 5
+dtwl: 3
+snng: 1
+sgzs: lvmb * swbs
+prjh: glzr - rvmp
+vplq: qqhc * htnc
+mppg: 3
+rbgm: 4
+jgvl: 5
+fdgq: 16
+nqmm: 3
+nprv: 18
+slmd: gndz * qzvw
+snlw: 2
+rznl: dstj + qtzh
+wqpt: ztpm * qbwp
+zljz: gddv + dmlf
+qrch: wgmc * szgp
+bgzw: zpdm + jhgt
+znrj: 8
+gtwf: 3
+gfmm: 14
+pwzv: wsrp * rbzl
+hnqh: 8
+qmfp: 1
+lrlz: 2
+mfmt: jsbb - fbwn
+rbzd: 2
+lbzg: mcct - gslb
+bhgw: pwnc + jnvb
+wttj: fggp + glcq
+gpcz: 18
+zlvl: 2
+lgfg: 2
+rzdh: dbsd - qbls
+vgbm: 2
+nsvz: rflf * vlqr
+swht: hcjd + qgwz
+vccz: hvcr * zsvc
+ttcl: 2
+zscf: 19
+slnt: 3
+gtct: szrw + gmnn
+zsdb: 9
+tvll: 2
+cdvl: zjmr + ftrd
+jhnh: 3
+gtgb: rltj + pmnt
+phlc: 5
+brjh: gwmq + twfc
+csdp: 5
+dldt: 4
+nsbs: 14
+tpmq: 2
+vbfr: 3
+smqb: 2
+hmft: jtph + bqhv
+ghqq: 4
+rbzl: 3
+hnbr: 2
+rhvb: bvfp * vvjw
+zhtl: 6
+cqln: 3
+gnsw: lghw * wbsf
+ndsc: fjmh + ccsm
+hbfc: 7
+cvfc: lrlz * zwhr
+dhjf: ffcm + tlhp
+rlnc: 3
+gvjh: jnrj * bcwt
+jsnr: gwgp * djpc
+hztl: 8
+hnbf: 5
+nrmn: 5
+fgqr: 7
+jjdm: bpdd + dgwj
+lsbc: 4
+mwwd: hbzr - pdqp
+qpqt: 13
+lpnp: fvwj * jbnh
+zpjh: grfc + jtcz
+nwqt: 3
+qbqp: zdlv + ttbm
+nttf: 4
+ffrl: 5
+wlvl: 14
+zwww: rtwv * hlzb
+qlcn: 6
+vngv: btbr - ztrd
+ccmw: 5
+qczt: mjgn + mhwd
+rjjf: vdtv + ljng
+wffd: gfjp * rpnd
+gbcv: 4
+vffr: jmph + mcpc
+mqbj: 5
+wfvv: 4
+btcm: jvbd + pmdp
+tfmt: 5
+cwhw: nsct * rzgd
+dzmw: 5
+nvfj: 6
+dnsn: gfjh - vlvn
+gvgp: mdnj + jsfs
+gfnh: 2
+vqzn: 2
+lqcl: jlzg + lpgc
+ptpd: 2
+msds: vnzz + rvqj
+sqlc: 2
+lnrq: 1
+nlbg: ctgg + lnrq
+gsfq: 2
+tglb: hgqz + wrtg
+lqnp: glgh + bpql
+cvjq: qthr + nnjb
+gndb: 9
+brhd: 15
+qjcs: fjpz / ndns
+bphn: 3
+vnzz: 4
+zrdl: 1
+jbnh: 3
+tgvz: stws * vnqt
+nhjc: 7
+rltj: zfpt * ftzs
+htzb: 11
+lhlc: lgrl * tqwq
+fzhz: 1
+bzrh: mgct / rpgv
+mrsf: vhlb - tmdf
+dgvm: qqdg + dlwp
+gvrv: wqqd * qpqw
+jmsq: 6
+vrzj: vrjs * wvgc
+gvdb: slbd + cfln
+fnnd: 2
+vgtq: hzsw - jqzz
+zpdm: mmsc + sprb
+gcff: vvqz * fgbq
+vljt: chgm * jvcs
+hjhn: cjhd / nzhw
+wczm: dmjc * wtns
+lzlf: lvhl * mggm
+mgzb: smgt + gjrz
+qdgd: 8
+jpmc: nwnm / trfm
+sbdq: 3
+lphc: lpgr / zmzc
+qtms: 6
+cpvn: mdcn * gtct
diff --git a/21/solution.mjs b/21/solution.mjs
new file mode 100644
index 0000000..da17565
--- /dev/null
+++ b/21/solution.mjs
@@ -0,0 +1,139 @@
+import { readFileSync } from 'node:fs';
+
+const input = readFileSync('input', 'utf-8');
+
+class Monkey {
+  constructor(monkeys, name) {
+    this.monkeys = monkeys;
+    this.name = name;
+    this.value = undefined;
+    this.formulas = [];
+    this.aliases = [];
+  }
+
+  addFormula(left, operator, right) {
+    this.formulas.push([left, operator, right]);
+    return this;
+  }
+
+  removeFormulasInvolving(name) {
+    this.formulas = this.formulas.filter(
+      ([left, _, right]) => left !== name && right !== name
+    );
+    return this;
+  }
+
+  addAlias(name) {
+    this.aliases.push(name);
+    return this;
+  }
+  
+  setValue(value) {
+    this.value = value;
+    return this;
+  }
+
+  solve(path = []) {
+    if (this.value !== undefined) {
+      return this.value;
+    }
+    for (const name of this.aliases) {
+      if (path.includes(name)) {
+        continue;
+      }
+      const value = this.monkeys[name].solve([...path, this.name]);
+      if (value !== 'UNKNOWN') {
+        return value;
+      }
+    }
+    for (const [left, operator, right] of this.formulas) {
+      if (path.includes(left) || path.includes(right)) {
+        continue;
+      }
+
+      const leftValue = this.monkeys[left].solve([...path, this.name]);
+      const rightValue = this.monkeys[right].solve([...path, this.name]);
+
+      if (leftValue === 'UNKNOWN' || rightValue === 'UNKNOWN') {
+        continue;
+      }
+
+      switch (operator) {
+        case '*': return leftValue * rightValue;
+        case '/': return leftValue / rightValue;
+        case '+': return leftValue + rightValue;
+        case '-': return leftValue - rightValue;
+      }
+    }
+    return 'UNKNOWN';
+  }
+}
+
+const monkeys = {};
+function getMonkey(name) {
+  if (!monkeys.hasOwnProperty(name)) {
+    monkeys[name] = new Monkey(monkeys, name)
+  }
+  return monkeys[name];
+}
+
+input
+  .split('\n')
+  .filter(line => !!line.trim())
+  .forEach(line => {
+    const match = line.match(/^(\w+):\s+(.+?)\s*$/);
+    if (!match) {
+      throw new Error(`Invalid monkey: ${line}`);
+    }
+    const name = match[1];
+    const job = match[2];
+
+    if (/^\d+$/.test(job)) {
+      getMonkey(name).setValue(parseInt(job));
+    } else {
+      const match = job.match(/^(\w+)\s*([*\/+\-=])\s*(\w+)$/);
+      if (!match) {
+        throw new Error(`Invalid formula: ${formula}`);
+      }
+      const left = match[1];
+      const operator = match[2];
+      const right = match[3];
+
+      switch (operator) {
+        case '*':
+          getMonkey(name).addFormula(left, '*', right);
+          getMonkey(left).addFormula(name, '/', right);
+          getMonkey(right).addFormula(name, '/', left);
+          break;
+        case '/':
+          getMonkey(name).addFormula(left, '/', right);
+          getMonkey(left).addFormula(name, '*', right);
+          getMonkey(right).addFormula(left, '/', name);
+          break;
+        case '-':
+          getMonkey(name).addFormula(left, '-', right);
+          getMonkey(left).addFormula(name, '+', right);
+          getMonkey(right).addFormula(left, '-', name);
+          break;
+        case '+':
+          getMonkey(name).addFormula(left, '+', right);
+          getMonkey(left).addFormula(name, '-', right);
+          getMonkey(right).addFormula(name, '-', left);
+          break;
+        default:
+          throw new Error(`Invalid operator: ${operator}`);
+      }
+    }
+  });
+
+const rootYells = monkeys['root'].solve();
+console.log('The root monkey will yell:', rootYells);
+
+for (const monkey of Object.values(monkeys)) {
+  monkey.removeFormulasInvolving('root');
+}
+const {0: left, 2: right} = monkeys['root'].formulas[0];
+monkeys[left].addAlias(right);
+monkeys[right].addAlias(left);
+const humnYells = monkeys['humn'].setValue(undefined).solve();
+console.log('To pass roots equality test, yell:', humnYells);