2f:T30e3,inputs = `\\.-/...-\\......../.|......|.........../..-..................|....-.\\............................../........... ..........-.............\\...\\.........|..\\.......................-..........-.......\\.../.......-/............ ........|.............-.....|..|........................\\.\\.../../.....-........................\\............. ....../\\.....................|........|.....-...........-..\\......./-.............................-........./. .\\..\\.............-........|.......|...|..............................-..-......-......|...................... ..........|/...\\.............\\............../-......\\.../........................./............./.../......../ ..............\\......./..-...............|...........\\...|............|...........-..-............|........... ..........-...............|..././...........................................|...........-.../.-.|.....|....... .........-...|..................-...........\\.-...................../.../........................|/......./... .................................-.././...................|\\..............|.........../....................... .............../......-.................\\....--.....-............................./.|./.................|..... ..../....|...|..................../....\\...|............|...../.././../--......\\.\\....|.......-............\\./ ......\\....-...|......\\...........-......./..................../.....-..............\\.............|......./... ............|.\\...................|.........................|........\\............................./.\\.......| ............../...............................|.........../.................\\-.................../........../. .|....|...........|..................|......./|\\\\.|\\.-...\\..../.........//........|............../...........| 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...........................\\/...........\\../..\\....................\\...........|.............-..........-..... .............../........\\|.........\\..........-......../............-..........|........|/.................... ....\\................-..................././........|.....|...........................-..|.................... \\-............-.......\\......\\.................../.......-.../............/....-..\\.......|................|.. .........................../....../.|...\\/...\\........-|.|.......\\..-........-............................../. .................\\.....................|..........|.............|......|/.\\..........................-........ ....\\../................................|.......-......|.................-......................|...-.../..... ....-.........|..../|..............................-|...............................-..-......\\.....-......... 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./.|............../.............................\\..|....\\-............./...................................... .........\\................../-.....|...........\\................|...../..................................|.... ..|...../.....|...............\\.....-.................................|/............-..|..-...|......-........ ....|....-..............|.......|............./\\-...........\\//.........|...........\\...../..............--... .............-........\\|...........................-....../....||............/......./....................../. |..................-......\\.........-.......|..............................\\.|/..................\\......\\.-... ....../.......................|........|..|.\\...........|.........\\................\\\\..................\\.../.. ...........-....|...........||...-.......|.|....-.....\\\\-................|.........../..................\\/.... ................|.-.................|-./..-..|.........-..............-.........-../........................-. .....................-.....................................|.........\\......||./................|............. ............/...-............|......./......................................../..........................-.... ..../.......\\.-............|..........|....-...........\\.-.................................\\./...|............ ...........|.-........|.|....-...........\\......-...-..........|.\\.|.|.....\\....\\............../.............. ......\\...\\....../....\\......\\.|......................./.......................\\.................../..../\\.... ...../.|...............|.../\\.........................................-...........|./........................| .........................-.-.......\\./..........|.........|/.......-......................-...-..|\\|........\\. ..................|......-..................|..........\\..-../........................-......\\...\\............ ..|...............\\.............../.........-./............../.../..../.|\\......\\..../-.....|....-.........|.. ...-..-..............--...|...................................................|.-.../.../.....\\.....\\......... .\\./.../..............././.........\\.........|..\\..........\\.................\\..|.....-......-................ ......-...................|../....................|...............|.............|/..\\.......|........\\......|. ......\\/.....|................./..................................|.......|./........|.............-...-......`30:Tad7,function* followBeams(contraption, start, maxSteps) { let resultMap = contraption.map((row) => row.map((el) => [el])); let beamPos = [start]; let steps = 0; let pushed = true; while (pushed && steps < maxSteps) { pushed = false; beamPos = beamPos.reduce((newBeamPos, pos) => { if ( pos.x >= 0 && pos.x < contraption[0].length && pos.y >= 0 && pos.y < contraption.length ) { /*if (resultMap[pos.y][pos.x][0] == ".") { resultMap[pos.y][pos.x][0] = directions[pos.dir].arrow; } else */ if ( !resultMap[pos.y][pos.x].includes(directions[pos.dir].arrow) ) { resultMap[pos.y][pos.x].push(directions[pos.dir].arrow); pushed = true; } } else { pushed = true; } pos.x += directions[pos.dir].dx; pos.y += directions[pos.dir].dy; if ( pos.x >= 0 && pos.x < contraption[0].length && pos.y >= 0 && pos.y < contraption.length ) { switch (contraption[pos.y][pos.x]) { case ".": newBeamPos.push(pos); break; case "\\": switch (pos.dir) { case "N": newBeamPos.push({ ...pos, dir: "W" }); break; case "E": newBeamPos.push({ ...pos, dir: "S" }); break; case "S": newBeamPos.push({ ...pos, dir: "E" }); break; case "W": newBeamPos.push({ ...pos, dir: "N" }); break; } break; case "/": switch (pos.dir) { case "N": newBeamPos.push({ ...pos, dir: "E" }); break; case "E": newBeamPos.push({ ...pos, dir: "N" }); break; case "S": newBeamPos.push({ ...pos, dir: "W" }); break; case "W": newBeamPos.push({ ...pos, dir: "S" }); break; } break; case "|": if (["E", "W"].includes(pos.dir)) { newBeamPos.push({ ...pos, dir: "N" }); newBeamPos.push({ ...pos, dir: "S" }); } else { newBeamPos.push(pos); } break; case "-": if (["N", "S"].includes(pos.dir)) { newBeamPos.push({ ...pos, dir: "E" }); newBeamPos.push({ ...pos, dir: "W" }); } else { newBeamPos.push(pos); } break; } } return newBeamPos; }, []); steps++; yield resultMap; } yield resultMap; }31:T506,function* tryAllEntries(contraption) { let max = 0; for (let x = 0; x < contraption[0].length; x++) { let resultMap = followBeams(contraption, { x: x, y: -1, dir: "S" }, 50003); max = Math.max( max, Array.from(resultMap) .pop() .flat() .filter((el) => el.length > 1).length ); yield [x, 0, max]; resultMap = followBeams( contraption, { x: x, y: contraption.length, dir: "N" }, 50003 ); max = Math.max( max, Array.from(resultMap) .pop() .flat() .filter((el) => el.length > 1).length ); yield [x, contraption.length, max]; } for (let y = 0; y < contraption.length; y++) { let resultMap = followBeams(contraption, { x: -1, y: y, dir: "E" }, 50003); max = Math.max( max, Array.from(resultMap) .pop() .flat() .filter((el) => el.length > 1).length ); yield [0, y, max]; resultMap = followBeams( contraption, { x: contraption[0].length, y: y, dir: "W" }, 50003 ); max = Math.max( max, Array.from(resultMap) .pop() .flat() .filter((el) => el.length > 1).length ); yield [contraption[0].length, y, max]; } yield [-1, -1, max]; }32:[] 2d:{"title":"Day 16 - The Floor Will Be Lava","cells":[{"id":0,"value":"# Day 16 - [The Floor Will Be Lava](https://adventofcode.com/2023/day/16)","pinned":false,"hidden":false,"mode":"md"},{"id":54,"value":"// !! replaced \"/\" and \"\\\" by \"⟍\" and \"⟋\" previously in inputs, to overcome escaping side effects !!","pinned":true,"hidden":false,"mode":"ojs"},{"id":5,"value":"inputs0 = `.|...\\\\....\n|.-.\\\\.....\n.....|-...\n........|.\n..........\n.........\\\\\n..../.\\\\\\\\..\n.-.-/..|..\n.|....-|.\\\\\n..//.|....`","pinned":false,"hidden":false,"mode":"ojs"},{"id":9,"value":"$2f","pinned":false,"hidden":false,"mode":"ojs"},{"id":7,"value":"contraption = inputs.split(\"\\n\").map((line) => line.split(\"\"))","pinned":true,"hidden":false,"mode":"ojs"},{"id":307,"value":"## Toolbox","pinned":false,"hidden":false,"mode":"md"},{"id":65,"value":"directions = ({\n N: { dx: 0, dy: -1, arrow: \"^\" },\n E: { dx: 1, dy: 0, arrow: \">\" },\n S: { dx: 0, dy: 1, arrow: \"v\" },\n W: { dx: -1, dy: 0, arrow: \"<\" }\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":168,"value":"plotResult = (resultMap) =>\n html`

${resultMap\n    .map((line) =>\n      line\n        .map((el) =>\n          el[0] != \".\"\n            ? el[0]\n            : el.length <= 2\n            ? el[el.length - 1]\n            : el.length - 1\n        )\n        .join(\" \")\n    )\n    .join(\"
\")}

`","pinned":true,"hidden":false,"mode":"ojs"},{"id":68,"value":"$30","pinned":true,"hidden":false,"mode":"ojs"},{"id":57,"value":"## Part 1","pinned":false,"hidden":false,"mode":"md"},{"id":98,"value":"resultMap = followBeams(contraption, { x: -1, y: 0, dir: \"E\" }, 50003)","pinned":true,"hidden":false,"mode":"ojs"},{"id":143,"value":"result1 = resultMap.flat().filter((el) => el.length > 1).length","pinned":true,"hidden":false,"mode":"ojs"},{"id":268,"value":"plotResult(resultMap)","pinned":true,"hidden":false,"mode":"ojs"},{"id":59,"value":"## Part 2","pinned":false,"hidden":false,"mode":"md"},{"id":255,"value":"$31","pinned":true,"hidden":false,"mode":"ojs"},{"id":263,"value":"maxResult = tryAllEntries(contraption)","pinned":true,"hidden":false,"mode":"ojs"},{"id":282,"value":"result2 = maxResult[2]","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W32","stdlib":"1","titling":"auto"}