Added Solution for 2020 day 12
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Burnus
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1
.gitignore
vendored
1
.gitignore
vendored
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@ -5,3 +5,4 @@ day00
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**/dbg.log
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**/2
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**/.vimdid
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**/rust-analyzer.core
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8
2020/day12_rain_risk/Cargo.toml
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8
2020/day12_rain_risk/Cargo.toml
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@ -0,0 +1,8 @@
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[package]
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name = "day12_rain_risk"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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77
2020/day12_rain_risk/challenge.txt
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77
2020/day12_rain_risk/challenge.txt
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Your ferry made decent progress toward the island, but the storm came in faster than anyone expected. The ferry needs to take *evasive actions*!
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Unfortunately, the ship's navigation computer seems to be malfunctioning; rather than giving a route directly to safety, it produced extremely circuitous instructions. When the captain uses the [PA system](https://en.wikipedia.org/wiki/Public_address_system) to ask if anyone can help, you quickly volunteer.
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The navigation instructions (your puzzle input) consists of a sequence of single-character *actions* paired with integer input *values*. After staring at them for a few minutes, you work out what they probably mean:
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* Action *`N`* means to move *north* by the given value.
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* Action *`S`* means to move *south* by the given value.
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* Action *`E`* means to move *east* by the given value.
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* Action *`W`* means to move *west* by the given value.
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* Action *`L`* means to turn *left* the given number of degrees.
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* Action *`R`* means to turn *right* the given number of degrees.
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* Action *`F`* means to move *forward* by the given value in the direction the ship is currently facing.
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The ship starts by facing *east*. Only the `L` and `R` actions change the direction the ship is facing. (That is, if the ship is facing east and the next instruction is `N10`, the ship would move north 10 units, but would still move east if the following action were `F`.)
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For example:
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```
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F10
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N3
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F7
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R90
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F11
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```
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These instructions would be handled as follows:
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* `F10` would move the ship 10 units east (because the ship starts by facing east) to *east 10, north 0*.
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* `N3` would move the ship 3 units north to *east 10, north 3*.
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* `F7` would move the ship another 7 units east (because the ship is still facing east) to *east 17, north 3*.
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* `R90` would cause the ship to turn right by 90 degrees and face *south*; it remains at *east 17, north 3*.
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* `F11` would move the ship 11 units south to *east 17, south 8*.
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At the end of these instructions, the ship's [Manhattan distance](https://en.wikipedia.org/wiki/Manhattan_distance) (sum of the absolute values of its east/west position and its north/south position) from its starting position is `17 + 8` = *`25`*.
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Figure out where the navigation instructions lead. *What is the Manhattan distance between that location and the ship's starting position?*
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Your puzzle answer was `1032`.
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\--- Part Two ---
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----------
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Before you can give the destination to the captain, you realize that the actual action meanings were printed on the back of the instructions the whole time.
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Almost all of the actions indicate how to move a *waypoint* which is relative to the ship's position:
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* Action *`N`* means to move the waypoint *north* by the given value.
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* Action *`S`* means to move the waypoint *south* by the given value.
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* Action *`E`* means to move the waypoint *east* by the given value.
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* Action *`W`* means to move the waypoint *west* by the given value.
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* Action *`L`* means to rotate the waypoint around the ship *left* (*counter-clockwise*) the given number of degrees.
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* Action *`R`* means to rotate the waypoint around the ship *right* (*clockwise*) the given number of degrees.
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* Action *`F`* means to move *forward* to the waypoint a number of times equal to the given value.
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The waypoint starts *10 units east and 1 unit north* relative to the ship. The waypoint is relative to the ship; that is, if the ship moves, the waypoint moves with it.
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For example, using the same instructions as above:
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* `F10` moves the ship to the waypoint 10 times (a total of *100 units east and 10 units north*), leaving the ship at *east 100, north 10*. The waypoint stays 10 units east and 1 unit north of the ship.
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* `N3` moves the waypoint 3 units north to *10 units east and 4 units north of the ship*. The ship remains at *east 100, north 10*.
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* `F7` moves the ship to the waypoint 7 times (a total of *70 units east and 28 units north*), leaving the ship at *east 170, north 38*. The waypoint stays 10 units east and 4 units north of the ship.
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* `R90` rotates the waypoint around the ship clockwise 90 degrees, moving it to *4 units east and 10 units south of the ship*. The ship remains at *east 170, north 38*.
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* `F11` moves the ship to the waypoint 11 times (a total of *44 units east and 110 units south*), leaving the ship at *east 214, south 72*. The waypoint stays 4 units east and 10 units south of the ship.
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After these operations, the ship's Manhattan distance from its starting position is `214 + 72` = *`286`*.
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Figure out where the navigation instructions actually lead. *What is the Manhattan distance between that location and the ship's starting position?*
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Your puzzle answer was `156735`.
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Both parts of this puzzle are complete! They provide two gold stars: \*\*
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At this point, you should [return to your Advent calendar](/2020) and try another puzzle.
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If you still want to see it, you can [get your puzzle input](12/input).
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BIN
2020/day12_rain_risk/day12_rain_risk-673.core
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BIN
2020/day12_rain_risk/day12_rain_risk-673.core
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Binary file not shown.
166
2020/day12_rain_risk/src/lib.rs
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166
2020/day12_rain_risk/src/lib.rs
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use core::fmt::Display;
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use std::num::ParseIntError;
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#[derive(Debug, PartialEq, Eq)]
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pub enum ParseError {
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ParseIntError(std::num::ParseIntError),
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LineMalformed(String),
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}
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impl From<ParseIntError> for ParseError {
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fn from(value: ParseIntError) -> Self {
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Self::ParseIntError(value)
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}
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}
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impl Display for ParseError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Self::ParseIntError(e) => write!(f, "Unable to parse into integer: {e}"),
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Self::LineMalformed(v) => write!(f, "Line is malformed: {v}"),
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}
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}
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}
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enum Action {
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North(isize),
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South(isize),
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East(isize),
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West(isize),
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Left(isize),
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Right(isize),
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Forwd(isize),
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}
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impl TryFrom<&str> for Action {
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type Error = ParseError;
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fn try_from(value: &str) -> Result<Self, Self::Error> {
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match value.chars().next() {
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Some('N') => Ok(Self::North(value[1..].parse()?)),
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Some('S') => Ok(Self::South(value[1..].parse()?)),
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Some('E') => Ok(Self::East(value[1..].parse()?)),
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Some('W') => Ok(Self::West(value[1..].parse()?)),
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Some('L') => Ok(Self::Left(value[1..].parse()?)),
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Some('R') => Ok(Self::Right(value[1..].parse()?)),
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Some('F') => Ok(Self::Forwd(value[1..].parse()?)),
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_ => Err(Self::Error::LineMalformed(value.to_string())),
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}
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}
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}
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struct Ferry {
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pos: (isize, isize),
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dir: isize,
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waypoint: (isize, isize),
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}
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impl Default for Ferry {
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fn default() -> Self {
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Self {
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pos: (0, 0),
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dir: 0,
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waypoint: (10, -1),
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}
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}
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}
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impl Ferry {
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fn perform_action(&mut self, action: &Action) {
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match action {
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Action::North(i) => self.pos.1 -= i,
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Action::South(i) => self.pos.1 += i,
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Action::East(i) => self.pos.0 += i,
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Action::West(i) => self.pos.0 -= i,
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Action::Left(i) => self.dir = (self.dir-i) % 360,
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Action::Right(i) => self.dir = (self.dir+i) % 360,
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Action::Forwd(i) => match self.dir {
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-90 | 270 => self.pos.1 -= i,
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90 | -270 => self.pos.1 += i,
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0 => self.pos.0 += i,
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180 | -180 => self.pos.0 -= i,
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_ => panic!("Trying to move in unknown direction {}", self.dir),
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},
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}
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}
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fn perform_waypoint_action(&mut self, action: &Action) {
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match action {
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Action::North(i) => self.waypoint.1 -= i,
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Action::South(i) => self.waypoint.1 += i,
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Action::East(i) => self.waypoint.0 += i,
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Action::West(i) => self.waypoint.0 -= i,
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Action::Left(i) => match i {
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90 => {
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let x = self.waypoint.0;
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self.waypoint.0 = self.waypoint.1;
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self.waypoint.1 = -x;
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},
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180 => {
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self.waypoint.0 *= -1;
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self.waypoint.1 *= -1;
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},
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270 => {
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let x = self.waypoint.0;
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self.waypoint.0 = -self.waypoint.1;
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self.waypoint.1 = x;
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},
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_ => panic!("Trying to turn left by unknown amount {i}"),
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},
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Action::Right(i) => match i {
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90 => {
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let x = self.waypoint.0;
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self.waypoint.0 = -self.waypoint.1;
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self.waypoint.1 = x;
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},
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180 => {
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self.waypoint.0 *= -1;
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self.waypoint.1 *= -1;
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},
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270 => {
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let x = self.waypoint.0;
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self.waypoint.0 = self.waypoint.1;
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self.waypoint.1 = -x;
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},
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_ => panic!("Trying to turn right by unknown amount {i}"),
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},
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Action::Forwd(i) => {
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self.pos.0 += i*self.waypoint.0;
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self.pos.1 += i*self.waypoint.1;
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},
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}
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}
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}
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pub fn run(input: &str) -> Result<(usize, usize), ParseError> {
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let mut ferry = Ferry::default();
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let actions: Vec<_> = input.lines().map(Action::try_from).collect::<Result<Vec<_>, _>>()?;
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actions.iter().for_each(|a| ferry.perform_action(a));
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let first = ferry.pos.0.unsigned_abs() + ferry.pos.1.unsigned_abs();
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ferry = Ferry::default();
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actions.iter().for_each(|a| ferry.perform_waypoint_action(a));
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let second = ferry.pos.0.unsigned_abs() + ferry.pos.1.unsigned_abs();
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Ok((first, second))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::fs::read_to_string;
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fn read_file(name: &str) -> String {
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read_to_string(name).expect(&format!("Unable to read file: {name}")[..]).trim().to_string()
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}
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#[test]
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fn test_sample() {
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let sample_input = read_file("tests/sample_input");
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assert_eq!(run(&sample_input), Ok((25, 286)));
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}
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#[test]
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fn test_challenge() {
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let challenge_input = read_file("tests/challenge_input");
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assert_eq!(run(&challenge_input), Ok((1032, 156735)));
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}
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}
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796
2020/day12_rain_risk/tests/challenge_input
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796
2020/day12_rain_risk/tests/challenge_input
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@ -0,0 +1,796 @@
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W1
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L90
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F26
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S3
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W2
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N5
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L180
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S4
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F41
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W1
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F48
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W3
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F44
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F63
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W5
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N3
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E5
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F7
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R180
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W1
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N3
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W3
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R180
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F38
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N1
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E3
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L90
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F49
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S5
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F11
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E1
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R90
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W3
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N4
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E3
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R180
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W5
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F93
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S1
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F67
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L180
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W3
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S5
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N3
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L180
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E1
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N2
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F90
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S3
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W3
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N3
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E1
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F77
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W3
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N3
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L180
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E2
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F25
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N1
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W1
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S1
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E5
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S4
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R180
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W1
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F13
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L90
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W4
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S5
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F13
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N2
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R90
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F89
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R90
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W3
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L90
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W5
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N5
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E4
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S4
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F26
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N1
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R270
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N5
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E5
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L180
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R180
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W4
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R90
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W5
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F49
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S2
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F53
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W5
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L180
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F54
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L90
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N3
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F3
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W5
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R180
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S4
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L90
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F49
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W4
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S5
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F73
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L270
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W1
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S4
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F46
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S4
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W2
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S5
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E4
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N4
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F6
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E4
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S4
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F38
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F4
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E4
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R90
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N1
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W2
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F20
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N3
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F64
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R90
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S3
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W5
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N1
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W4
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N3
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F17
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R90
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F62
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E4
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E2
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F47
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R90
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W1
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N3
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R90
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N2
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R90
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F57
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L270
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N2
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W3
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S5
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W4
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E2
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S5
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F93
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F57
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S1
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L90
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F50
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N2
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F4
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N1
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L90
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F34
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N2
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L90
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N4
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W3
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N5
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R180
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S3
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L90
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W3
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S3
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L90
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F70
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L90
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E1
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F92
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N1
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F96
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F85
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S5
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L90
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W1
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L90
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W1
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F23
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L90
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S1
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R90
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W5
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S5
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F66
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W3
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L180
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W2
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L90
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N2
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E3
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R270
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R270
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N3
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W5
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R90
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S3
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E1
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R90
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F78
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E1
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S1
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R90
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S3
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F52
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S4
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F9
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L90
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W1
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N2
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F8
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R90
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N1
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F63
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E5
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F18
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E3
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F43
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E2
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F10
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R90
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F96
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S5
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F22
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W2
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S5
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F39
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R90
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F38
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S5
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R90
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E3
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L90
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W3
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N2
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F14
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L270
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S4
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F78
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F85
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L90
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N3
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E3
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S3
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F98
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E2
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S2
|
||||
F100
|
||||
S3
|
||||
S3
|
||||
W5
|
||||
W3
|
||||
S5
|
||||
F67
|
||||
L180
|
||||
S2
|
||||
E5
|
||||
S1
|
||||
L90
|
||||
N5
|
||||
E2
|
||||
W2
|
||||
R90
|
||||
E1
|
||||
N2
|
||||
L90
|
||||
F77
|
||||
W1
|
||||
F84
|
||||
L90
|
||||
S2
|
||||
E4
|
||||
R90
|
||||
E1
|
||||
R90
|
||||
S3
|
||||
S4
|
||||
F89
|
||||
R90
|
||||
N1
|
||||
E4
|
||||
R90
|
||||
N1
|
||||
F97
|
||||
L90
|
||||
S1
|
||||
W3
|
||||
R180
|
||||
F70
|
||||
S5
|
||||
E1
|
||||
L180
|
||||
W5
|
||||
F86
|
||||
S3
|
||||
F20
|
||||
R90
|
||||
S1
|
||||
W4
|
||||
R90
|
||||
W1
|
||||
F3
|
||||
S3
|
||||
R90
|
||||
F43
|
||||
L180
|
||||
F81
|
||||
E2
|
||||
N3
|
||||
F16
|
||||
L90
|
||||
S2
|
||||
F17
|
||||
E3
|
||||
F1
|
||||
E4
|
||||
F17
|
||||
W3
|
||||
N3
|
||||
W5
|
||||
S3
|
||||
W4
|
||||
F60
|
||||
E3
|
||||
E1
|
||||
S5
|
||||
L90
|
||||
E2
|
||||
S5
|
||||
F19
|
||||
E2
|
||||
R90
|
||||
F20
|
||||
R180
|
||||
S4
|
||||
F9
|
||||
R90
|
||||
N5
|
||||
W5
|
||||
F56
|
||||
N2
|
||||
L180
|
||||
N1
|
||||
E5
|
||||
L90
|
||||
F15
|
||||
W4
|
||||
F26
|
||||
R90
|
||||
W2
|
||||
F19
|
||||
S3
|
||||
W1
|
||||
R90
|
||||
W5
|
||||
R180
|
||||
W4
|
||||
N2
|
||||
F86
|
||||
N5
|
||||
E3
|
||||
W3
|
||||
N3
|
||||
L270
|
||||
W3
|
||||
F42
|
||||
N5
|
||||
W2
|
||||
R180
|
||||
W2
|
||||
R180
|
||||
S4
|
||||
R90
|
||||
F55
|
||||
S3
|
||||
R90
|
||||
S3
|
||||
E3
|
||||
R90
|
||||
F11
|
||||
S4
|
||||
F38
|
||||
W1
|
||||
L90
|
||||
F8
|
||||
R90
|
||||
E5
|
||||
R90
|
||||
W1
|
||||
W5
|
||||
S2
|
||||
F2
|
||||
F92
|
||||
S3
|
||||
F77
|
||||
S5
|
||||
R90
|
||||
F24
|
||||
E3
|
||||
R90
|
||||
N3
|
||||
F16
|
||||
L270
|
||||
W3
|
||||
F83
|
||||
L270
|
||||
E2
|
||||
F98
|
||||
L180
|
||||
F89
|
||||
E5
|
||||
F98
|
||||
S4
|
||||
E2
|
||||
L90
|
||||
N4
|
||||
L180
|
||||
F57
|
||||
S5
|
||||
R90
|
||||
L90
|
||||
S4
|
||||
W4
|
||||
S5
|
||||
S4
|
||||
W4
|
||||
F43
|
||||
N2
|
||||
F29
|
||||
W3
|
||||
R90
|
||||
F41
|
||||
R90
|
||||
N2
|
||||
F78
|
||||
R90
|
||||
E5
|
||||
N1
|
||||
W2
|
||||
F6
|
||||
L270
|
||||
W5
|
||||
F91
|
||||
W5
|
||||
N1
|
||||
S4
|
||||
F41
|
||||
W4
|
||||
F74
|
||||
E1
|
||||
R90
|
||||
N4
|
||||
F76
|
||||
W4
|
||||
S2
|
||||
L180
|
||||
N2
|
||||
R180
|
||||
W4
|
||||
F79
|
||||
R270
|
||||
W1
|
||||
F92
|
||||
W1
|
||||
L90
|
||||
F71
|
||||
N4
|
||||
L180
|
||||
W4
|
||||
F16
|
||||
W5
|
||||
F84
|
||||
S5
|
||||
F35
|
||||
W4
|
||||
R90
|
||||
F25
|
||||
L180
|
||||
N1
|
||||
E3
|
||||
F15
|
||||
S4
|
||||
R180
|
||||
F46
|
||||
S1
|
||||
W1
|
||||
R180
|
||||
E4
|
||||
N5
|
||||
R90
|
||||
S1
|
||||
W3
|
||||
S3
|
||||
L270
|
||||
F94
|
||||
R180
|
||||
N1
|
||||
W4
|
||||
N5
|
||||
W2
|
||||
S2
|
||||
W3
|
||||
F53
|
||||
L180
|
||||
S3
|
||||
F19
|
||||
N3
|
||||
F54
|
||||
L180
|
||||
S5
|
||||
F8
|
||||
S1
|
||||
N5
|
||||
L90
|
||||
E4
|
||||
N3
|
||||
F28
|
||||
R180
|
||||
F23
|
||||
E1
|
||||
L90
|
||||
E3
|
||||
F6
|
||||
W4
|
||||
R90
|
||||
N1
|
||||
F89
|
||||
S1
|
||||
W2
|
||||
S5
|
||||
F8
|
||||
N3
|
||||
F23
|
||||
N4
|
||||
F5
|
||||
L90
|
||||
N3
|
||||
R90
|
||||
W4
|
||||
L180
|
||||
S3
|
||||
F7
|
||||
N2
|
||||
W3
|
||||
R180
|
||||
E1
|
||||
L180
|
||||
S4
|
||||
R90
|
||||
S1
|
||||
F99
|
||||
N3
|
||||
F96
|
||||
W3
|
||||
R90
|
||||
F73
|
||||
W5
|
||||
F71
|
||||
R180
|
||||
S2
|
||||
F84
|
||||
N4
|
||||
F4
|
||||
W4
|
||||
R90
|
||||
F34
|
||||
E2
|
||||
W2
|
||||
F53
|
||||
N4
|
||||
R90
|
||||
N5
|
||||
E5
|
||||
R90
|
||||
F60
|
||||
N4
|
||||
F28
|
||||
S2
|
||||
W1
|
||||
N4
|
||||
F54
|
||||
R270
|
||||
F45
|
||||
S5
|
||||
F93
|
||||
L90
|
||||
F66
|
||||
R180
|
||||
F92
|
||||
N4
|
||||
F97
|
||||
R90
|
||||
W5
|
||||
S1
|
||||
W5
|
||||
F68
|
||||
S3
|
||||
L90
|
||||
E3
|
||||
F94
|
||||
S4
|
||||
F64
|
||||
R180
|
||||
F18
|
||||
N1
|
||||
S4
|
||||
E5
|
||||
E2
|
||||
F81
|
||||
N1
|
||||
L90
|
||||
F3
|
||||
R90
|
||||
F81
|
||||
W4
|
||||
S4
|
||||
E5
|
||||
N5
|
||||
R270
|
||||
E3
|
||||
S2
|
||||
W1
|
||||
L180
|
||||
S1
|
||||
F84
|
||||
W2
|
||||
L270
|
||||
F6
|
||||
N1
|
||||
R180
|
||||
E5
|
||||
F7
|
||||
E2
|
||||
L180
|
||||
E2
|
||||
F80
|
||||
N1
|
||||
L90
|
||||
F88
|
||||
R90
|
||||
W5
|
||||
N1
|
||||
F71
|
||||
R180
|
||||
N2
|
||||
E2
|
||||
R90
|
||||
N1
|
||||
W1
|
||||
L90
|
||||
E4
|
||||
S4
|
||||
L180
|
||||
F27
|
||||
L90
|
||||
F57
|
||||
F38
|
||||
W5
|
||||
L180
|
||||
S5
|
||||
R90
|
||||
S4
|
||||
W1
|
||||
S3
|
||||
L90
|
||||
F36
|
||||
S1
|
||||
W5
|
||||
R90
|
||||
F65
|
||||
R90
|
||||
E1
|
||||
N4
|
||||
E1
|
||||
F14
|
||||
L90
|
||||
F44
|
||||
R90
|
||||
F34
|
||||
S2
|
||||
L90
|
||||
R180
|
||||
F87
|
||||
W3
|
||||
L90
|
||||
F9
|
||||
R90
|
||||
W3
|
||||
L90
|
||||
S5
|
||||
F69
|
||||
S3
|
||||
W4
|
||||
N4
|
||||
F30
|
||||
W5
|
||||
F15
|
||||
R90
|
||||
L180
|
||||
W4
|
||||
F5
|
||||
R180
|
||||
E1
|
||||
F6
|
||||
R180
|
||||
S1
|
||||
F20
|
||||
E1
|
||||
S2
|
||||
E5
|
||||
F13
|
||||
N5
|
||||
F83
|
||||
W2
|
||||
L270
|
||||
E2
|
||||
R90
|
||||
S5
|
||||
F62
|
||||
R270
|
||||
N4
|
||||
R90
|
||||
F20
|
||||
L90
|
||||
N2
|
||||
E3
|
||||
L90
|
||||
F37
|
||||
N2
|
||||
N2
|
||||
F82
|
||||
L90
|
||||
F23
|
||||
E3
|
||||
F63
|
||||
R180
|
||||
F1
|
||||
N2
|
||||
R90
|
||||
F68
|
||||
E5
|
||||
F75
|
||||
R90
|
||||
W3
|
||||
R180
|
||||
E4
|
||||
E1
|
||||
N3
|
||||
R90
|
||||
N3
|
||||
L180
|
||||
F92
|
||||
R90
|
||||
S4
|
||||
F27
|
||||
R180
|
||||
S4
|
||||
L180
|
||||
W5
|
||||
F70
|
||||
S5
|
||||
L180
|
||||
F89
|
||||
R90
|
||||
W2
|
||||
N3
|
||||
F64
|
||||
L90
|
||||
E1
|
||||
L90
|
||||
F77
|
||||
E4
|
||||
F55
|
||||
E2
|
||||
L90
|
||||
W2
|
||||
F46
|
||||
N2
|
||||
R90
|
||||
F94
|
||||
S5
|
||||
R180
|
||||
F9
|
||||
L180
|
||||
S4
|
||||
L90
|
||||
F25
|
||||
5
2020/day12_rain_risk/tests/sample_input
Normal file
5
2020/day12_rain_risk/tests/sample_input
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
F10
|
||||
N3
|
||||
F7
|
||||
R90
|
||||
F11
|
||||
Loading…
Add table
Add a link
Reference in a new issue