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The ground is rumbling almost continuously now, but the strange valves bought you some time. It's definitely getting warmer in here, though.\n\n– [Advent of Code 2022, Day 17](https://adventofcode.com/2022/day/17)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":851,"value":"viewof play = Inputs.button(\"Replay\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":156,"value":"{\n play;\n for (const { p, shape, chamber } of run(12))\n yield Plot.plot({\n marks: [\n Plot.ruleY([-1]),\n Plot.ruleX([-1, 7]),\n Plot.dot(shape.points, {\n x: (s) => p[0] + s[0],\n y: (s) => p[1] + s[1],\n stroke: \"gray\"\n }),\n Plot.dot(chamber, { symbol: \"square\", fill: \"black\" })\n ],\n y: { domain: [-1, 20] },\n width: 200\n });\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"function* shapes() {\n const shapes = `\n####\n\n.#.\n###\n.#.\n\n..#\n..#\n###\n\n#\n#\n#\n#\n\n##\n##\n`\n .trim()\n .split(\"\\n\\n\")\n .map((raw) => {\n const points = [];\n for (let [y, r] of Object.entries(raw.split(\"\\n\").reverse()))\n for (let [x, c] of Object.entries(r))\n if (c === \"#\") points.push([+x, +y]);\n return {\n raw,\n points,\n width: d3.max(points, (d) => d[0]) + 1\n };\n });\n while (true) for (const f of shapes) yield f;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":257,"value":"test = `>>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":258,"value":"$31","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":471,"value":"viewof which = Inputs.radio([\"test\", \"data\"], {label: \"Select one\", value: \"data\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":558,"value":"input = which === \"test\" ? test : data","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":30,"value":"function* jets() {\n while (true) for (const d of input) yield d === \"<\" ? -1 : 1;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":112,"value":"w = 7","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"function* run(n) {\n const s = shapes();\n const j = jets();\n const chamber = new d3.InternSet([], String);\n let h = -1;\n\n while (n-- > 0) {\n // rock appears\n const { value: shape } = s.next();\n let p = [2, h + 4];\n yield { p, shape, chamber };\n\n // move rock until rest\n while (true) {\n // jet\n const { value: dx } = j.next();\n p = move(p, [dx, 0], shape, chamber);\n yield { p, shape, m: [dx, 0], chamber };\n\n // down\n const last = p;\n p = move(p, [0, -1], shape, chamber);\n yield { p, last, shape, m: [0, -1], chamber };\n if (p === last) break;\n }\n // rest it\n for (const [dx, dy] of shape.points) {\n const sy = p[1] + dy;\n if (sy > h) h = sy;\n chamber.add([p[0] + dx, sy]);\n }\n yield { p, shape, chamber, h };\n\n // prune chamber\n // for (const c of chamber) if (c[1] < h - 1000) chamber.delete(c);\n }\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":20,"value":"move = (p, [dx, dy], { points, width }, chamber) => {\n const [x, y] = p;\n // check extents\n if (x + dx < 0 || x + dx + width > w || y + dy < 0) return p;\n // check chamber\n const n = [x + dx, y + dy];\n if (points.some(([px, py]) => chamber.has([n[0] + px, n[1] + py]))) return p;\n return n;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":304,"value":"last = (g) => d3.reduce(g, (s, d) => d)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":221,"value":"part1 = last(run(2022)).h + 1","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":508,"value":"function* heights(n) {\n yield undefined;\n for (const {h} of run(n)) if (h !== undefined) yield h;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":671,"value":"h = [...heights(5000)]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":858,"value":"slope = (h[4000] - h[1]) / (4000 - 1) - 1e-2","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":691,"value":"fn = (d, i) => d - i * slope","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":449,"value":"Plot.plot({\n marks: [\n Plot.line(h, {\n x: (d, i) => i,\n y: fn,\n strokeWidth: 1\n }),\n Plot.ruleX([p0, p1, start, start + period])\n ],\n grid: true,\n width\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":535,"value":"Looks like a period! Let’s do this kinda manually and pull out the periodic part.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":668,"value":"p1 = d3.maxIndex(h, fn)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":698,"value":"p0 = d3.maxIndex(h.slice(0, 4500), fn)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":703,"value":"period = p1 - p0","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":720,"value":"delta = h[p1] - h[p0]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":723,"value":"start = p0 - period","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":739,"value":"A piecewise function based on the parameters above…","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":731,"value":"prediction = (x) => {\n if (x < start) return h[x];\n const multiple = Math.floor((x - start) / period);\n const offset = (x - start) % period;\n return h[start + offset] + multiple * delta;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":806,"value":"part1 === prediction(2022)+1","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":742,"value":"part2 = prediction(1000000000000)+1 // 1553982300887, 1553982300888","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W32","stdlib":"1"}} 30:"$2f:body"