Day 3
This commit is contained in:
parent
a084977819
commit
feeb43943a
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@ -0,0 +1,140 @@
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........954......104.......52......70..............206.806........708..........................217...............................440........
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.......@...................*.............................*.664..............677................@....459.........687.........................
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..................378.....398........548..495..........983....*................*..282.................*...........$.248.....409.......165...
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......261........................704.&.......*................943...615.504.....6....*773..........687..../973.2*.....=.311*....*..../......
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187..-....&...............828....*......*268..488....534.........................................................244.........722.286........
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........663.254.723.@.......*.842....696............../...163.512&.............797.......................749................................
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230.........*.....*.442...563...............................*.....................*716...................*...395............352..594&.......
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...........468.522............................+33........660....&......................................891......-...#.......................
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......929...........*261..680............-...........@.........29.312.............972.......................704.....545.56*274......537.....
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........*.......................+.#158..311.........987............*................&....923................*...837.............561...%.....
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......35....75.....715........382...........855............/440..890.224.....613............*......622./....810....*632.........%...........
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............*.....%.......286........534.................$............*...........277.....851..14...*...645.............916../.......682....
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.....189..641.%.........%....*..........$...694.214*......137.......16........26.....+..%........&.675.........511........*..848.184*.....55
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....99.....................................*.360.......................805..509../.........284.....&981..827....714.................410.....
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...*.................+.601&..10&........202.......753...........................208..925...*..........................652...752.....#.......
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...411......656...448..............................&......888.749..677...............=...970.................128....-....*..*....@..........
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.............*.......................236.60...181..........*.....*....-.713.170................@.......839.....*....116.....79.431.=........
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.689...542..46................483.....*....*...*.....#..289..348.483........*........=...731....376...@.....656.....................924.&...
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.........*.............340......&..@..92..314.3...572.........$.......408.177........728....*....................325...929..............852.
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........824....323....*...........157....................126............*.....640...........404...................*......@........430.......
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.649..............*.723.......32............375......480*....537..637.467.....*....=598.............959.......263..136......718...*....#....
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..........931..316...........*...........78*................../..*.........611..........979.@...198....*751...*.........123./......579..733.
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.81&.....*..............772.884......809..................435.....940............162*........96...*............145....../......414..........
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.......#.511......204....................706*.....442........*........213.............116......................................./...........
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625...60............*..............@.........870.#...........17.......*.......725.....*...........-..696.......114......../.......=.........
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288.....697*............................*614....975.............999.........599..........332..........978..60......./...................*...
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...*............701..961..180........998..................211..............$...............*...310..................953.....$..153...861....
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356........%344..@....*....*........................267....+...421%........................697....*...........531.........776.....*......193
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........#...........757.925................360.........................261......71.....950.........490....-../........+..........989........
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634...385....*70............................*.......%........311...457*.......%........*...640..........687.......=...946...................
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...*......514....973....100...46..570..21....155.....692.575..../..............977.233........$.................931...........*..240+.......
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332.............*........*........#....-................./.........944..............*............230.....+...........889.....462.......615..
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....951.............-............716.261.......................234....*..................&........................................439.......
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................*.........563+............*.............805.....%....681..............393...909..247.$415.............=..+..................
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..954.644...-...35...%425........890....857.......%.521..+..438...............437..............@...@.........563.....133..696...............
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...$........887.............&466.*..............547.%.........*...804....118...=..15.......302...............*......................80..%549
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410.....@.......%....*....*793.......946.....67*863.895.........511.....628..............945..764....*.........455...............$.....880..
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...*.......331....540.540.............*................*192.............................*.........103.......................................
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.311......*..................954......602.766.403...............#.....307..239..417......617..........959...416.........&521................
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.....-..51.....732.......-...=.....$.........*......695........131....*...*.....................494@..*......*...............+...983........
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...284.....337....+......541.......345..........306.........%........111..677........679.............738..#...537............523...%..338...
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.....*........=.473....+..38.........120.......294................+519.............899........*...........263...606/.545..............828...
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..993.............$..76....*.........%.....302.........886+.513............................193...*....................@...........592.......
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.......783..............872....533......%..+....................../.............................425...387........%.......958........*..6....
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.......423.........*........771..902.......167.........*...665.988.........606.....30.....*..........469..=.........745.610..542.......679..
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....333...103.409.......583.............................688..92.........-........415....615.....*519............805.493.......297...........
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751*.........*...............926............899.............*........963..420................&...............*.....*.....286.......=495.....
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..................244.......*.........784.....%..737.......942.962.........-...3..........909.............160.358...........*............832
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........600.830....*..779....988......%.....*......*....................%..........$...............262..................335.433..81.....*...
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.151.......*......................$......271.302.34.....150............575.43..425.109...169........@.....@......63..25..+.............849..
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573..551.855............201................*482.586.........677.........802..619........83....*.....22........#......................560*...
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...*..............747..*.......699.....+........*.........*....&..256.........................998..*.....823...993.........&.............662
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.164.634#..........*..556.........*...286....437.......483.815.....*.....*................654.....67..................#.....633.8*..........
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...........998..855..........67..398.............107...............610.620...........721.-.............946.900.439.283............959.199...
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.211*916..*..........&...524*.............436...*.............518...............893.*................*.....*...*...........=..........-.....
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..........235..%...473......................*....54..............*.....-......../....551............833..994.81......*640...70....74....*770
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...$..........950........190..704.380....442.............@264.821...-.918......................427................275.............*..248....
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....443..................*...........*........738.................484......................691.+.........%949..........749.....658..........
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...833...920....#....*........131..................717...............222.....858..*...........%........*.530....996...........*....109......
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......*.....$.......389.331..@.......................*.................*.*......*..612......168.....672...$..........%.....788.15.......625.
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...815..........................40.589...98......./...574........451.403..327..140..............................945...136............64.....
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..............124..*........49......*..........200.........162....+.....................914..........461......./....%.................=.....
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..808.......=......363........*......27....397.........107...*.......739+....232....+........68*395.................322..166+...=.......471.
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...........465..............893..355..........*....70......963................*..133..........................................419.499.......
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..................336..62.......*...........798.......*885....../..431.851..176.............=.............583$.....................*........
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........*................405.......405.......*689........*994...........328...980......*.....159..*.............256....................-703.
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.....444..................*......=........275.........421........479............*....54.........*..324....47.....#....332*855.946...........
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..........233....735*325.162....900.............................*................725....@.....453............499...............*............
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...820....*..............................848..974..82............178...54..............688.....................*...340.810..749.............
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.712........$....*..858.......*.................706...49......................+...653.......*.......*.......588..............168.313........
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..........776...740...........107........612..........................644.................242..................*695......236.#....*....761..
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.....767..............995..................*.447*...........130......*...........513..................................#........384....*.....
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..93..860....469.905............%..........*494...../215..../.#................@...980....501.................839.*....@....................
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......*...&..&...*....278........286..............$......183................840...*............941........300......578.259.558.....*..389...
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........................559.523..6.673.................292+..#......./....871=...........638....97..*.........629............28........975..
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...*80.........545.....991....765.....595...361.......785...111.582...#........890......388.....*209......964...+.....+............475......
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971....666.................................*...........%.............500...653........@....*.391..........+....882..................*.......
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.153*....925.439....#..........752.....*............634..*...500&..177....47....73...................74.................+..*................
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..320...*223........................%...........232..171.714.......139...*..............909............606.........=......272...............
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.......*....................25.....$...........................*965............771.............*.......741.............$......229.@707......
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....*..............................422...............208....*.............................*549..*....313.430.....892.................274....
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..88...-.....28....440.........305*...................*...789.@...../222.......898.............571....=..*............183....856............
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320*......$206.........491*......*.....171..919..........486.........966$..........230......25.......126..............906....234............
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....#....................345......%406....*.....%.....169..........858...*...763.............%181.274.......74....$........*..998...........
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..167....230...................%........341.......................%.....827........................................814..374...........922...
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...................=..................*.....769...#..........*.....545.863........$............@....791....403.....298........402*763..536..
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.535.......675.....975.314.284*..................=....49.......$.............454..211............316......................989...@.....600...
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............*..................528..........&...793...........700...................*.....770......*.........-....321.....*......277........
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...391..291..625..........................703.....................972@...797........24.92....*......822.900...703....*212.558...............
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....*..=...................160.165..........................#.............+..4..........*.262.............*......................+..........
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...837........736-..........+.....*...217-.347....446....785.....897..546....&...555.898.......382......75...48......../.....655..586.......
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........536../....204....+.............807....................*833.677.480...322=.939...............587.....575..*.............546..........
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........=...974.....@...........$........%.......672.......317......@................&....789.-....&.....$......268..................780....
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...*....776......951..*............*157.................254......&...628........*........104......................941.563................871
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....586...............88........283..........100.986.......*...142...*.......567...............783................................663.......
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.........641..........................213....*...*........468........127..........%.............*....202.........340*.............*.........
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.367......#......274............445..*......96.232..............175.............403.726...642..561......*............790.........433........
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@ -0,0 +1,141 @@
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use std::{collections::HashSet, str::FromStr};
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pub fn run() {
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let input = include_str!("../input/day3.txt");
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// let input = r#"467..114..
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// ...*......
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// ..35..633.
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// ......#...
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// 617*......
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// .....+.58.
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// ..592.....
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// ......755.
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// ...$.*....
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// .664.598.."#;
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let grid: Grid = input.parse().unwrap();
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let all_part_numbers = grid
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.symbol_positions()
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.into_iter()
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.flat_map(|pos| grid.adjacent_numbers(pos))
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.collect::<HashSet<_>>();
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let parts_sum: u32 = all_part_numbers
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.into_iter()
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.map(|pos| grid.parse_number_starting_at(pos))
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.sum();
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dbg!(parts_sum);
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let gears_sum: u32 = grid
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.gear_positions()
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.into_iter()
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.map(|pos| grid.gear_ratio(pos))
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.sum();
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dbg!(gears_sum);
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}
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struct Grid {
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chars: Vec<Vec<char>>,
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}
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impl FromStr for Grid {
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type Err = Box<dyn std::error::Error>;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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let chars = s
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.lines()
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.filter(|l| !l.is_empty())
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.map(|l| l.trim().chars().collect::<Vec<_>>())
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.collect::<Vec<_>>();
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let count = chars[0].len();
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for line in chars.iter().skip(1) {
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assert_eq!(count, line.len());
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}
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Ok(Grid { chars })
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}
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}
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impl Grid {
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fn symbol_positions(&self) -> Vec<(usize, usize)> {
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let mut positions = vec![];
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for (row, line) in self.chars.iter().enumerate() {
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for (col, c) in line.iter().enumerate() {
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if c.is_ascii_digit() {
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continue;
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} else if *c == '.' {
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continue;
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} else {
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positions.push((col, row));
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}
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}
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}
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positions
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}
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fn adjacent_numbers(&self, (col, row): (usize, usize)) -> HashSet<(usize, usize)> {
|
||||||
|
let mut adjacent = HashSet::new();
|
||||||
|
for dc in -1isize..=1 {
|
||||||
|
for dr in -1isize..=1 {
|
||||||
|
if dc == 0 && dr == 0 {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
let c = col as isize + dc;
|
||||||
|
let r = row as isize + dr;
|
||||||
|
if c < 0
|
||||||
|
|| c >= self.chars[0].len() as isize
|
||||||
|
|| r < 0
|
||||||
|
|| r >= self.chars.len() as isize
|
||||||
|
{
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
if let Some(pos) = self.start_position_of_number_containig((c as usize, r as usize))
|
||||||
|
{
|
||||||
|
adjacent.insert(pos);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
adjacent
|
||||||
|
}
|
||||||
|
|
||||||
|
fn start_position_of_number_containig(
|
||||||
|
&self,
|
||||||
|
(col, row): (usize, usize),
|
||||||
|
) -> Option<(usize, usize)> {
|
||||||
|
let line = &self.chars[row];
|
||||||
|
if !line[col].is_ascii_digit() {
|
||||||
|
return None;
|
||||||
|
}
|
||||||
|
let mut start = col;
|
||||||
|
while start > 0 && line[start - 1].is_ascii_digit() {
|
||||||
|
start -= 1;
|
||||||
|
}
|
||||||
|
Some((start, row))
|
||||||
|
}
|
||||||
|
|
||||||
|
fn parse_number_starting_at(&self, (col, row): (usize, usize)) -> u32 {
|
||||||
|
self.chars[row][col..]
|
||||||
|
.iter()
|
||||||
|
.take_while(|c| c.is_ascii_digit())
|
||||||
|
.collect::<String>()
|
||||||
|
.parse()
|
||||||
|
.unwrap()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn gear_positions(&self) -> Vec<(usize, usize)> {
|
||||||
|
self.symbol_positions()
|
||||||
|
.into_iter()
|
||||||
|
.filter(|(col, row)| {
|
||||||
|
self.chars[*row][*col] == '*' && self.adjacent_numbers((*col, *row)).len() == 2
|
||||||
|
})
|
||||||
|
.collect()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn gear_ratio(&self, pos: (usize, usize)) -> u32 {
|
||||||
|
let adjacent = self
|
||||||
|
.adjacent_numbers(pos)
|
||||||
|
.into_iter()
|
||||||
|
.map(|pos| self.parse_number_starting_at(pos))
|
||||||
|
.collect::<Vec<_>>();
|
||||||
|
adjacent[0] * adjacent[1]
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -3,7 +3,8 @@
|
||||||
|
|
||||||
mod day01;
|
mod day01;
|
||||||
mod day02;
|
mod day02;
|
||||||
|
mod day03;
|
||||||
|
|
||||||
fn main() {
|
fn main() {
|
||||||
day02::run();
|
day03::run();
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue