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Complete day 12 #10

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tlater merged 3 commits from tlater/day-12 into master 2020-12-12 20:40:50 +00:00
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[package]
name = "day-12"
version = "0.1.0"
authors = ["Tristan Daniël Maat <tm@tlater.net>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
indoc = "0.3"

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N2
F32
F17
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F12
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N4
F32
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N2
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F44
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F5
E4
R90
N5
E4
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N5
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L90
W2
N5
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F48
W2
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N1
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E5
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F53
S4
F86
N2
F88
E5
F59
E1
F56
W2
N4
W4
R180
F16
F25
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N3
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W4
S4
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E5
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W2
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N4
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S3
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E3
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F19
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S5
F58
E4
S4
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W1
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L90
E3
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N3
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N4
W5
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N2
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N1
F16
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S5
L180
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W1
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S2
N3
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N4
R90
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E3
L90
W3
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N3
F34
W1
N3
S2
F80
E5
F65
L90
E5
N1
F80
R90
W3
L90
N1
L180
S1
F65
E3
S1
W3
F89
S1
F24
E5
F85
W1
F87
S1
R90
S4
F3
S3
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N4
L90
N5
R90
N2
R90
S2
W4
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F52
W1
N5
L90
N4
S3
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R90
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E1
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N5
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N4
F22
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S4
F60
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N3
F32
S2
F80
R90
F18
S3
L90
F90
E3
L90
N3
E5
F79
N5
W4
S5
F100
N1
E3
S3
F49
R180
S3
E2
F1
W1
F5
R180
S5
W3
S3
F67
R270
N3
W3
N1
W3
F37
L90
N3
L90
F68
N3
W4
W2
F26
N3
L90
W3
S2
F7
W3
E3
L270
F64
R90
E4
R90
W3
N1
W1
F98
R270
W5
F45
R90
F49
E4
S2
F58
F56
W3
F57
E3
S5
R180
E3
F82
F57
S3
W2
R90
E2
R90
F95
W4
F85
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N3
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R90
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E3
S4
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use std::fs;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let input = fs::read_to_string("input")?;
let actions = parse_actions(&input)?;
// Part 1
let location = simulate_ship_movement(&actions);
println!("{}", location.0.abs() + location.1.abs());
Ok(())
}
#[derive(Copy, Clone, Debug)]
enum Action {
North(u32),
South(u32),
East(u32),
West(u32),
Left(u32),
Right(u32),
Forward(u32),
}
impl Action {
fn new(input: &str) -> Result<Self, String> {
if input.len() < 2 {
Err(format!("Invalud input line: {}", input))?;
}
let (action, value) = input.split_at(1);
let value = value
.parse()
.map_err(|e| format!("Could not parse value: {}", e))?;
Ok(match action {
"N" => Self::North(value),
"S" => Self::South(value),
"E" => Self::East(value),
"W" => Self::West(value),
"L" => Self::Left(value),
"R" => Self::Right(value),
"F" => Self::Forward(value),
_ => Err(format!("Could not parse action: {}", action))?,
})
}
fn opposite_direction(self) -> Self {
match self {
Action::North(x) => Action::South(x),
Action::South(x) => Action::North(x),
Action::East(x) => Action::West(x),
Action::West(x) => Action::East(x),
_ => panic!("Invalid direction"),
}
}
fn right_direction(self) -> Self {
match self {
Action::North(x) => Action::East(x),
Action::South(x) => Action::West(x),
Action::East(x) => Action::South(x),
Action::West(x) => Action::North(x),
_ => panic!("Invalid direction"),
}
}
fn left_direction(self) -> Self {
match self {
Action::North(x) => Action::West(x),
Action::South(x) => Action::East(x),
Action::East(x) => Action::North(x),
Action::West(x) => Action::South(x),
_ => panic!("Invalid direction"),
}
}
}
fn parse_actions(input: &str) -> Result<Vec<Action>, String> {
input.lines().map(Action::new).collect()
}
fn simulate_ship_movement(actions: &Vec<Action>) -> (i64, i64) {
let mut coords: (i64, i64) = (0, 0);
let mut direction = Action::East(0);
for action in actions {
// If the action is Action::Forward, we instead want to move
// in a direction determined by our current angle.
//
// So we convert Action::Forward to a concrete direction.
let converted_action = if let &Action::Forward(amount) = action {
match direction {
Action::North(_) => Action::North(amount),
Action::South(_) => Action::South(amount),
Action::East(_) => Action::East(amount),
Action::West(_) => Action::West(amount),
_ => unreachable!("Direction can only be NSEW."),
}
} else {
*action
};
match converted_action {
Action::North(amount) => {
coords.1 += amount as i64;
}
Action::South(amount) => {
coords.1 -= amount as i64;
}
Action::East(amount) => {
coords.0 += amount as i64;
}
Action::West(amount) => {
coords.0 -= amount as i64;
}
Action::Left(amount) => match amount % 360 {
0 => direction = direction,
90 => direction = direction.left_direction(),
180 => direction = direction.opposite_direction(),
270 => direction = direction.right_direction(),
_ => panic!("Only 90 degree turns allowed"),
},
Action::Right(amount) => match amount % 360 {
0 => direction = direction,
90 => direction = direction.right_direction(),
180 => direction = direction.opposite_direction(),
270 => direction = direction.left_direction(),
_ => panic!("Only 90 degree turns allowed"),
},
Action::Forward(_) => unreachable!("Converted previously"),
}
}
coords
}
#[cfg(test)]
mod tests {
use super::*;
use indoc::indoc;
#[test]
fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
let input = indoc!(
"F10
N3
F7
R90
F11
"
);
let actions = parse_actions(&input)?;
let location = simulate_ship_movement(&actions);
assert_eq!(location.0.abs() + location.1.abs(), 25);
Ok(())
}
}