Day 4
This commit is contained in:
parent
a617d211ba
commit
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4 changed files with 306 additions and 0 deletions
91
2018/Cargo.lock
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91
2018/Cargo.lock
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@ -1,4 +1,95 @@
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[[package]]
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name = "aho-corasick"
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version = "0.6.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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[[package]]
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name = "aoc2018"
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name = "aoc2018"
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version = "0.1.0"
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version = "0.1.0"
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dependencies = [
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"regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "cfg-if"
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version = "0.1.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "lazy_static"
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version = "1.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "libc"
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version = "0.2.44"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "memchr"
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version = "2.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.44 (registry+https://github.com/rust-lang/crates.io-index)",
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"version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex"
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version = "1.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
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"memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
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"thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.6.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "thread_local"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "ucd-util"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "utf8-ranges"
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version = "1.0.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "version_check"
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version = "0.1.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e9a933f4e58658d7b12defcf96dc5c720f20832deebe3e0a19efd3b6aaeeb9e"
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"checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
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"checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
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"checksum libc 0.2.44 (registry+https://github.com/rust-lang/crates.io-index)" = "10923947f84a519a45c8fefb7dd1b3e8c08747993381adee176d7a82b4195311"
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"checksum memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0a3eb002f0535929f1199681417029ebea04aadc0c7a4224b46be99c7f5d6a16"
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"checksum regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37e7cbbd370869ce2e8dff25c7018702d10b21a20ef7135316f8daecd6c25b7f"
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"checksum regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4e47a2ed29da7a9e1960e1639e7a982e6edc6d49be308a3b02daf511504a16d1"
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"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
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"checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
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"checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
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"checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
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@ -4,3 +4,4 @@ version = "0.1.0"
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authors = ["Jeremy Kaplan <jdkaplan@metagram.net>"]
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authors = ["Jeremy Kaplan <jdkaplan@metagram.net>"]
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[dependencies]
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[dependencies]
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regex = "1"
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211
2018/src/day4.rs
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211
2018/src/day4.rs
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@ -0,0 +1,211 @@
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use std::collections::HashMap;
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extern crate regex;
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const INPUT: &str = include_str!("input/day4.txt");
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// const INPUT: &str = include_str!("input/day4_test.txt");
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#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
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struct Timestamp {
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date: String,
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hour: u32,
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minute: u32,
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}
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#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
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enum Event {
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WokeUp,
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FellAsleep,
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ShiftChange(String),
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}
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#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
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struct Entry {
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timestamp: Timestamp,
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event: Event,
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}
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fn parse_input() -> Vec<Entry> {
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let re: regex::Regex =
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regex::Regex::new(r"^\[(\d{4}-\d{2}-\d{2}) (\d{2}):(\d{2})] (.*)$").unwrap();
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let re_shift: regex::Regex = regex::Regex::new(r"^Guard #(\d+) begins shift$").unwrap();
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let mut entries = Vec::new();
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for line in str::lines(INPUT) {
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let caps = re.captures(line).unwrap();
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let date = caps.get(1).unwrap().as_str().to_string();
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let hour = caps.get(2).unwrap().as_str().to_string().parse().unwrap();
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let minute = caps.get(3).unwrap().as_str().to_string().parse().unwrap();
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let ev = match caps.get(4).unwrap().as_str() {
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"wakes up" => Event::WokeUp,
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"falls asleep" => Event::FellAsleep,
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shift => {
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let caps = re_shift.captures(shift).unwrap();
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Event::ShiftChange(caps.get(1).unwrap().as_str().to_string())
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}
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};
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entries.push(Entry {
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timestamp: Timestamp {
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date: date,
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hour: hour,
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minute: minute,
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},
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event: ev,
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});
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}
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entries
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}
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#[derive(Debug, Clone)]
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enum State {
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Awake,
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Asleep,
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}
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#[derive(Debug, Clone)]
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struct Minute {
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timestamp: Timestamp,
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guard: String,
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state: State,
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}
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fn get_events(entries: &mut Vec<Entry>) -> Vec<Minute> {
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entries.sort();
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match entries[0].event {
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Event::ShiftChange(_) => (),
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_ => panic!("Invalid entry list!"),
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}
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let mut states = Vec::new();
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let mut guard = "".to_string();
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for e in entries {
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let m = match &e.event {
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Event::ShiftChange(g) => {
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guard = g.to_string();
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Minute {
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timestamp: e.timestamp.clone(),
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guard: guard.to_string(),
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state: State::Awake,
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}
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}
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Event::FellAsleep => Minute {
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timestamp: e.timestamp.clone(),
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guard: guard.to_string(),
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state: State::Asleep,
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},
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Event::WokeUp => Minute {
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timestamp: e.timestamp.clone(),
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guard: guard.to_string(),
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state: State::Awake,
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},
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};
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states.push(m);
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}
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states
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}
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fn sleep_intervals(ms: Vec<Minute>) -> Vec<((String, u32, u32))> {
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let mut i = 0;
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let mut ps = Vec::new();
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while i + 1 < ms.len() {
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let p1 = ms[i].clone();
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let p2 = ms[i + 1].clone();
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match (p1, p2) {
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(
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Minute {
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timestamp:
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Timestamp {
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date: _,
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hour: _,
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minute: m1,
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},
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guard: g1,
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state: State::Asleep,
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},
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Minute {
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timestamp:
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Timestamp {
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date: _,
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hour: _,
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minute: m2,
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},
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guard: g2,
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state: State::Awake,
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},
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) => {
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if g1 == g2 {
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ps.push((g1, m1, m2));
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}
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}
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_ => {}
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}
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i += 1;
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}
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ps
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}
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fn mode(ms: Vec<u32>) -> u32 {
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let mut buckets = HashMap::new();
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for m in ms {
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let mut b = buckets.entry(m).or_insert(0);
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*b += 1;
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}
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let mut elts: Vec<(&u32, &u32)> = buckets.iter().collect();
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elts.sort_by(|l, r| r.1.cmp(l.1));
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*(elts[0].0)
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}
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fn interpolate_sleep(sleeps: Vec<(String, u32, u32)>) -> HashMap<String, Vec<u32>> {
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let mut minutes_asleep: HashMap<String, Vec<u32>> = HashMap::new();
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for (g, m1, m2) in sleeps {
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let mut ms = minutes_asleep.entry(g).or_insert(Vec::new());
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let mut m = m1;
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while m < m2 {
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ms.push(m);
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m += 1;
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}
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}
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minutes_asleep
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}
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fn sleep_data() -> HashMap<String, Vec<u32>> {
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let mut input = parse_input();
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let events = get_events(&mut input);
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let sleeps = sleep_intervals(events);
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let minutes_asleep = interpolate_sleep(sleeps);
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minutes_asleep
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}
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pub fn part1() -> u32 {
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let mut most_asleep = ("".to_string(), Vec::new());
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for (g, ms) in sleep_data() {
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if ms.len() > most_asleep.1.len() {
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most_asleep = (g, ms);
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}
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}
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let guard = most_asleep.0.parse::<u32>().unwrap();
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let minute = mode(most_asleep.1);
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minute * guard
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}
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fn mode2(ms: Vec<(u32, u32)>) -> (u32, u32) {
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let mut buckets = HashMap::new();
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for m in ms {
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let mut b = buckets.entry(m).or_insert(0);
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*b += 1;
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}
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let mut elts: Vec<(&(u32, u32), &u32)> = buckets.iter().collect();
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elts.sort_by(|l, r| r.1.cmp(l.1));
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*(elts[0].0)
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}
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pub fn part2() -> u32 {
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let mut points: Vec<(u32, u32)> = Vec::new();
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for (g, ms) in sleep_data() {
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for m in ms {
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points.push((g.parse::<u32>().unwrap(), m.clone()));
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}
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}
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let (g, m) = mode2(points);
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g * m
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}
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@ -1,6 +1,7 @@
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mod day1;
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mod day1;
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mod day2;
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mod day2;
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mod day3;
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mod day3;
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mod day4;
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fn main() {
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fn main() {
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println!("Day 1 part 1: {}", day1::part1());
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println!("Day 1 part 1: {}", day1::part1());
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@ -9,4 +10,6 @@ fn main() {
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println!("Day 2 part 2: {}", day2::part2());
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println!("Day 2 part 2: {}", day2::part2());
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println!("Day 3 part 1: {}", day3::part1());
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println!("Day 3 part 1: {}", day3::part1());
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println!("Day 3 part 2: {}", day3::part2());
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println!("Day 3 part 2: {}", day3::part2());
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println!("Day 4 part 1: {}", day4::part1());
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println!("Day 4 part 2: {}", day4::part2());
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}
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}
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