diff --git a/aoc2021/input/day08.txt b/aoc2021/input/day08.txt new file mode 100644 index 0000000..4aa4902 --- /dev/null +++ b/aoc2021/input/day08.txt @@ -0,0 +1,200 @@ +beacf afbd bcead cgefa ecdbga efb gbfdeac ecgfbd acbdfe fb | bf efb bgecdfa egcfa +cbdgef cdfageb cegbd fecba edgf dcfbe dbcafg df fcd dbegca | bgcdef dgbec bfeac fdeg +bgdcfa dgabf bfdec baefd abeg eda afcdge ea bfceadg dfegba | efbad fbdea dae fagbd +cfdabe fcgbe gcdeb ecdfgb bdc cdgf cd cfageb bgdae daebfcg | decbaf cdfg deabg cd +eacgdfb fdbeca agedc cbedf dcfgab bgef gdf fdgec fbcged gf | gf acegd fdeabgc gfd +egcd aebdcf gbeca eg edfcbga gbe cfbag bdeca gadbec bdgefa | caegfbd dgcebfa eg bgdfae +fcgab egafb gedbca gfc cf ceagdf cafbdeg gcafbd dbagc cfdb | dbecga dbgcefa cfg fcg +geacd bg cbfead efgabcd fbace ceabg efbadg gfbc gab geabcf | cfbg fabce bg fdgeacb +bfceg ca baefc caedfb acfedgb cfad edacbg eac debaf bdfage | geadbc bfgeacd efagcdb cefbg +fd dcfbge fcad dfg bgaefc fdcgab fgdceab afdbg cbagf gdaeb | 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fbeac | ebgad gfed debfcag fdge +bgac edgacbf dfbea cgebda gea cfedga agedb ag dcgeb fcedgb | dbage bdgacef cfagdeb deabg +caebd edf edgfbc fe abfegdc cdfea gfdac eacfgd gfacbd gaef | fega fgae gafe cabde +bfadegc dafec dbgaec abdcef fdaegc dag cagf ga aedgf fbedg | bcafedg ag ga adg +dcgfa dgcafeb cfb bf cegafb begcda fdgbce dcebg bfed fcgdb | dgcebaf bedf fb bcged +cbegd edfa fdc gadcfb gbcefad bgacef acfbe ebacfd bfecd fd | fdc dbgafc cefbd cdf +fgd dgbfe gf gcef bdecf dgcfba acfbde gdefbc badge facbdeg | dcfaebg fg fgd fbgced +abdeg adebcg ebafdc bgcadfe gedc ega bgdaf cabed efacbg ge | ge gae age afebgdc +debfa dfbga fagdc fbg cadgfe acgfbd efgcab cgfeabd dbcg bg | fgdba bg gfacbed ecabgf +bc egdba ebdacg cgba dabfec bec defcg cdbefga gbfead becdg | bcefagd bec cebfgda cb +deagbfc agebdc fbedca fa edgafc bfac adcbe gfedb afd efdab | fad dbaef cbfdae af +afgdeb beagd daecbfg gbfedc ecd becad egac agecbd ce fbcda | fbadge eacdbg cde ce +fgabec gefb cdagefb fbacgd dgecba adecf eg cefga egc gcfba | dafgbc gec bfeg gefb +gbcf fceag gb bag bdafge gbeac fdegca cfegdab egfacb daceb | bg cagfeb aedbc cbaeg +gbac fedagb gaf adcbf ceabfd abecgfd bfcdga ga edgcf gfcda | badcf fcedg adbcfg agebfd +gdbfc fbaecd gaef ef efb agebc gabdefc ebcgad facegb bgcfe | cfgdbae faeg efga cdegab +fbacge decgba bcafd fedgab fageb ed efgd ebafd gedbcfa bed | de ed bdafe de +bcgdf badgec de fecgd cfeag dfbe dcgafeb gdacfb ced fdbgce | de de edc gafbdc +gebfa fd dgacb dfgba bfdeca daf becfga edfg afgebcd gfadbe | bdcfea bafecgd acdegfb fgbdea +fgdcb efdcg gcfabd gcdbafe gbf acfb aegcdb edfabg fb gbcda | bgafde gfcbd fb cedbfga +de fadcg befcdg fbeac adcef efd ebgfca cbefadg edba dbaecf | eagbfcd beagfc bcefgd beda +ebcfad fbecgd edgba df adgfcbe dfe bcfaeg bedgf bcefg dgfc | df bcagef df aecfgb +acgdb gdc gcebdaf abcge ecgdfa egbd cbaegf gdacbe fcdba dg | egcfda aebgfc aegcbdf cgd +gc cge cgdb deafbgc dageb cbega agbcde cedgfa gbefad cefab | dabfeg gc eabcgdf gabde +abegc agecf adfcbge bcdaeg fbadec bca cb bcgd egdba gbafde | gbdc begad bfecda cb +daecgb abegd bagedf begfcd fe feag abefd bfe fbgceda fbdac | fbdac gcebdaf egfa fe +eafcbdg abcdg acegf dfcga fgaebc defcbg aefd dfc dfgace df | df adef fd dfea +fdecabg ba agebdc adb gcdea befdg gabc egdba badefc ecagdf | bda gcabde gdaec fgdcae +cdfg dbecf dg caebdf gbd beafg cbegfd ebcgdfa gdfeb agdecb | cedfb gd cbgeafd debgacf +bca cadbfeg gabfcd bcgafe caebg adgfec bc bcfe gefac beadg | cgefab cgfae befc acbegf +cabgdef cgabde efcab degcf gcfdeb da fgda cda feagcd aedcf | adc da cgaedf cgdfbe +dagfbe gaefb efcgadb fbcae fg gbf edbag cbgdae gadfbc gfde | bgf gf acgdfb cfgdba +cbedag edgca bfcagde gfbae gfdea df adfc dafceg fedbcg gdf | adecg gbafe acdbfeg df +ebfc ef gecfad gfdcb egbad gfabcd ecgdafb feg bfgdce dbefg | aegdb bfged ef bafdgc +ce cefd cafdg cdgefa geacbd eca gcbfad gebfa afecg bfedcga | ecgfa cea defc ce +ceb edbgafc fabec cb dfagec fgbea daefcb efdca cebgda bfdc | bec eadfgbc degabc adgfce +cgf aefbdgc gf bagf gedacf ecgfb cdfeb acgbe ebcfga cedbga | gf fbgcade cbegfda acbdfeg diff --git a/aoc2021/input/day08_provided.txt b/aoc2021/input/day08_provided.txt new file mode 100644 index 0000000..c9f629b --- /dev/null +++ b/aoc2021/input/day08_provided.txt @@ -0,0 +1,10 @@ +be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe +edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc +fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg +fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb +aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea +fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb +dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe +bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef +egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb +gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce diff --git a/aoc2021/src/day08.rs b/aoc2021/src/day08.rs new file mode 100644 index 0000000..7ec0260 --- /dev/null +++ b/aoc2021/src/day08.rs @@ -0,0 +1,68 @@ +use std::fmt::Write; + +use anyhow::{Context, Result}; + +const INPUT: &str = include_str!("../input/day08.txt"); + +pub fn run() -> Result { + let mut res = String::with_capacity(128); + + writeln!(res, "part 1: {}", part1(INPUT)?)?; + + Ok(res) +} + +fn part1(input: &str) -> Result { + let entries = input + .lines() + .map(TryInto::try_into) + .collect::>>()?; + + Ok(entries.iter().map(Entry::count_easy_digits_in_output).sum()) +} + +struct Entry<'a> { + four_digits_output: Vec<&'a str>, +} + +impl<'a> Entry<'a> { + fn count_easy_digits_in_output(&self) -> usize { + self.four_digits_output + .iter() + .filter(|digit| Self::is_easy_digit(digit)) + .count() + } + + fn is_easy_digit(digit: &str) -> bool { + matches!(digit.len(), 2 | 3 | 4 | 7) + } +} + +impl<'a> TryFrom<&'a str> for Entry<'a> { + type Error = anyhow::Error; + + fn try_from(s: &'a str) -> Result { + let (_, output) = s.split_once(" | ").context("couldn't split on ` | `")?; + + Ok(Self { + four_digits_output: output.trim().split(' ').collect(), + }) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + const PROVIDED: &str = include_str!("../input/day08_provided.txt"); + + #[test] + fn part1_provided() { + assert_eq!(part1(PROVIDED).unwrap(), 26); + } + + #[test] + fn part1_real() { + assert_eq!(part1(INPUT).unwrap(), 488); + } +} diff --git a/aoc2021/src/lib.rs b/aoc2021/src/lib.rs index 5fb1402..31b0d7e 100644 --- a/aoc2021/src/lib.rs +++ b/aoc2021/src/lib.rs @@ -7,3 +7,4 @@ pub mod day04; pub mod day05; pub mod day06; pub mod day07; +pub mod day08; diff --git a/aoc2021/src/main.rs b/aoc2021/src/main.rs index 2bc1b96..7d1b154 100644 --- a/aoc2021/src/main.rs +++ b/aoc2021/src/main.rs @@ -9,6 +9,7 @@ use aoc2021::day04; use aoc2021::day05; use aoc2021::day06; use aoc2021::day07; +use aoc2021::day08; fn main() -> Result<()> { let days: &[DayFunc] = &[ @@ -19,6 +20,7 @@ fn main() -> Result<()> { day05::run, day06::run, day07::run, + day08::run, ]; aoc::run(days)