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.#..####.##..#. #.#.#....#####. ..#..##.#.###.. ..#..##.#.###.. #.#.#....###### .#..####.##..#. ...#....#...#.# #..#####..##..# #..##..##..##.. .######..##..## .#....#.#..#.#. ..####........# ..####...##...# ##.##.#.#..#.#. ...##...####... #.#..#.#....#.# .#.##.#..##..#. ##.##.###..###. ..#..#........# .##..#.....#. ....#..##.##. ####.....#.## ####.###..#.# #####.#...#.. #..#.#.###### .#...#......# .##.##...#### ####....##.## ####.#...#### ####.#...#### ####....##.## .##.##...#### ..##..##. ..######. ####..### ...#..... ###.##.## ..##..##. ##......# ####..######. .#.#..#.#..## #..#..#..#### ###.##.###### ...#..#...### ..######..#.. #.######.#### ..#.##.#..### #..####..#.## ..#.### ##...#. ##...#. ..#.### #..###. #####.. #####.. #.####. ..#.### ....##... ....##### ......#.. ..######. #####.#.. ##..#.#.. ..#...#.. ..##...## ##..##.## ###.##### ..##...## ..#..##.. ......### ###.##... ##.#..### ##..#.# ###.##. #.#...# #.#...# ###.##. ##..#.# .#.#.#. ###.#.. ###.#.. .#.#.#. ##.##.# ###.##. #.#...# ####..... ..#.#..#. ####.#..# ....##..# #####.##. .###.#### .##.#.... ##.##.##. ###...##. .###..##. #.#...... #.#...... .###..##. ###...##. ##.##.##. ##.##.#.. ##.##.#.. .##.##..# ..###...# #...#..## .###.##.# ..##..#.# ..##..#.. .###.##.# #####.##.####.### ...#.####...#.... ##.###.#..##.#### .##..##...##..#.. .######.....##### ##.#..######.#### .##.###.##..##... ...#####..#.#...# ...##..#.....#.## ..#.#...#......## ..#.#...#......## ######.## ##..###.. .......#. #.##.#..# ###.####. ######..# .#..#.#.# #....###. .......## .####.##. #....#... ..##....# ..##....# ######... .#..#..## .#..#..## ######...`31:[] 2e:{"title":"Advent of Code 2023 - #13","cells":[{"id":0,"value":"# Advent of Code 2023 - #13\n\nhttps://adventofcode.com/2023/day/13 1h25’","pinned":false,"hidden":false,"mode":"md"},{"id":8,"value":"maps = input\n .split(\"\\n\\n\")\n .map((puzzle) => puzzle.split(\"\\n\").map((line) => [...line]))","pinned":true,"hidden":false,"mode":"ojs"},{"id":64,"value":"binary = (puzzle) => ({\n cols: puzzle[0].map((_, k) => d3.sum(puzzle, (line, i) => (1 << i) * (line[k] === \"#\"))),\n rows: puzzle.map((line) => d3.sum(line, (d, i) => (1 << i) * (d === \"#\")))\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":31,"value":"test = (r, skip) => {\n const n = r.length;\n return d3.range(1, r.length).find((i) => {\n if (i === skip) return false;\n if (2 * i < n)\n return r.slice(0, i).reverse().join(\",\") === r.slice(i, 2 * i).join(\",\");\n return (\n r\n .slice(2 * i - n, i)\n .reverse()\n .join(\",\") === r.slice(i, n).join(\",\")\n );\n });\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":102,"value":"score = (puzzle) => {\n const { cols, rows } = binary(puzzle);\n return test(cols) ?? 100 * test(rows);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":105,"value":"answer1 = d3.sum(maps, score)","pinned":true,"hidden":false,"mode":"ojs"},{"id":110,"value":"---\n## Part 2\n","pinned":false,"hidden":false,"mode":"md"},{"id":111,"value":"A valid smudge flips a bit in the binary representation, both in rows and columns; if the flipped bit does not cause the flipped row to match another existing row, or the flipped column to match another existing column, there is no reflection. Otherwise, test it more thoroughly.","pinned":false,"hidden":false,"mode":"md"},{"id":117,"value":"findSmudge = ({ cols, rows }) => {\n const currentScore = test(cols) ?? 10000 * test(rows);\n\n const C = d3.group(\n cols.map((c, i) => ({ c, i })),\n ({ c }) => c\n );\n const R = d3.group(\n rows.map((c, i) => ({ c, i })),\n ({ c }) => c\n );\n for (let x = 0; x < cols.length; ++x) {\n for (let y = 0; y < rows.length; ++y) {\n // flip the bit\n cols[x] ^= 1 << y;\n rows[y] ^= 1 << x;\n\n // test\n let score;\n if (C.has(cols[x])) score = test(cols, currentScore);\n if (!score && R.has(rows[y]))\n score = 100 * test(rows, currentScore / 10000);\n\n // restore\n cols[x] ^= 1 << y;\n rows[y] ^= 1 << x;\n\n if (score) return { x, y, score };\n }\n }\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":121,"value":"answer2 = d3.sum(maps, (d) => findSmudge(binary(d)).score)","pinned":true,"hidden":false,"mode":"ojs"},{"id":227,"value":"{\n // This runs in about 3ms, but Jo has found an optimization to go < 1ms!\n // https://observablehq.com/@jwolondon/advent-of-code-2023-day-13\n const t0 = performance.now();\n d3.sum(maps, (d) => findSmudge(binary(d)).score);\n return performance.now() - t0;\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":3,"value":"$30","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W31","stdlib":"1","titling":"auto"}