2015: day06
This commit is contained in:
parent
fb0bb469ee
commit
c99426fd39
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aoc2015/input/day06.txt
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aoc2015/input/day06.txt
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205
aoc2015/src/day06.rs
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aoc2015/src/day06.rs
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@ -0,0 +1,205 @@
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use std::error::Error;
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use std::str::FromStr;
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use aoc::err;
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use aoc::Result;
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const INPUT: &str = include_str!("../input/day06.txt");
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pub fn run() -> Result<()> {
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println!("part 1: {}", part1(INPUT)?);
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println!("part 2: {}", part2(INPUT)?);
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Ok(())
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}
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fn part1(input: &str) -> Result<usize> {
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let instructions = input
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.lines()
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.map(|line| {
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line.trim_end()
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.parse()
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.map_err(|e| err!("couldn't parse instruction: {}", e))
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})
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.collect::<Result<Vec<Instruction>>>()?;
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let mut grid: Vec<Vec<bool>> = vec![vec![false; 1000]; 1000];
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for inst in instructions {
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match inst.action {
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Action::TurnOn => {
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((inst.horizontal.0)..=(inst.horizontal.1))
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.flat_map(|i| ((inst.vertical.0)..=(inst.vertical.1)).map(move |j| (i, j)))
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.for_each(|(x, y)| {
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grid[x][y] = true;
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});
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}
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Action::TurnOff => {
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((inst.horizontal.0)..=(inst.horizontal.1))
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.flat_map(|i| ((inst.vertical.0)..=(inst.vertical.1)).map(move |j| (i, j)))
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.for_each(|(x, y)| {
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grid[x][y] = false;
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});
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}
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Action::Toggle => {
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((inst.horizontal.0)..=(inst.horizontal.1))
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.flat_map(|i| ((inst.vertical.0)..=(inst.vertical.1)).map(move |j| (i, j)))
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.for_each(|(x, y)| {
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grid[x][y] = !grid[x][y];
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});
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}
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}
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}
|
||||||
|
|
||||||
|
Ok(grid
|
||||||
|
.iter()
|
||||||
|
.flat_map(|line| line.iter())
|
||||||
|
.filter(|v| **v)
|
||||||
|
.count())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn part2(input: &str) -> Result<u64> {
|
||||||
|
let instructions = input
|
||||||
|
.lines()
|
||||||
|
.map(|line| {
|
||||||
|
line.trim_end()
|
||||||
|
.parse()
|
||||||
|
.map_err(|e| err!("couldn't parse instruction: {}", e))
|
||||||
|
})
|
||||||
|
.collect::<Result<Vec<Instruction>>>()?;
|
||||||
|
|
||||||
|
let mut grid: Vec<Vec<u64>> = vec![vec![0; 1000]; 1000];
|
||||||
|
|
||||||
|
for inst in instructions {
|
||||||
|
match inst.action {
|
||||||
|
Action::TurnOn => {
|
||||||
|
((inst.horizontal.0)..=(inst.horizontal.1))
|
||||||
|
.flat_map(|i| ((inst.vertical.0)..=(inst.vertical.1)).map(move |j| (i, j)))
|
||||||
|
.for_each(|(x, y)| {
|
||||||
|
grid[x][y] = grid[x][y].saturating_add(1);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
Action::TurnOff => {
|
||||||
|
((inst.horizontal.0)..=(inst.horizontal.1))
|
||||||
|
.flat_map(|i| ((inst.vertical.0)..=(inst.vertical.1)).map(move |j| (i, j)))
|
||||||
|
.for_each(|(x, y)| {
|
||||||
|
grid[x][y] = grid[x][y].saturating_sub(1);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
Action::Toggle => {
|
||||||
|
((inst.horizontal.0)..=(inst.horizontal.1))
|
||||||
|
.flat_map(|i| ((inst.vertical.0)..=(inst.vertical.1)).map(move |j| (i, j)))
|
||||||
|
.for_each(|(x, y)| {
|
||||||
|
grid[x][y] = grid[x][y].saturating_add(2);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(grid.iter().flat_map(|line| line.iter()).sum())
|
||||||
|
}
|
||||||
|
|
||||||
|
enum Action {
|
||||||
|
TurnOn,
|
||||||
|
TurnOff,
|
||||||
|
Toggle,
|
||||||
|
}
|
||||||
|
|
||||||
|
struct Instruction {
|
||||||
|
action: Action,
|
||||||
|
horizontal: (usize, usize),
|
||||||
|
vertical: (usize, usize),
|
||||||
|
}
|
||||||
|
|
||||||
|
impl FromStr for Instruction {
|
||||||
|
type Err = Box<dyn Error>;
|
||||||
|
|
||||||
|
fn from_str(s: &str) -> Result<Self> {
|
||||||
|
let mut space = s
|
||||||
|
.find(' ')
|
||||||
|
.ok_or_else(|| err!("couldn't parse instruction: {}", s))?;
|
||||||
|
|
||||||
|
let action = if &s[..space] == "toggle" {
|
||||||
|
Action::Toggle
|
||||||
|
} else if &s[..space] == "turn" {
|
||||||
|
space = s[(space + 1)..]
|
||||||
|
.find(' ')
|
||||||
|
.ok_or_else(|| err!("couldn't parse instruction: {}", s))?
|
||||||
|
+ space
|
||||||
|
+ 1;
|
||||||
|
if &s[..space] == "turn on" {
|
||||||
|
Action::TurnOn
|
||||||
|
} else if &s[..space] == "turn off" {
|
||||||
|
Action::TurnOff
|
||||||
|
} else {
|
||||||
|
return Err(err!("couldn't identify action: {}", &s[..space]));
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
return Err(err!("couldn't identify action: {}", s));
|
||||||
|
};
|
||||||
|
let s = &s[(space + 1)..];
|
||||||
|
|
||||||
|
let comma = s
|
||||||
|
.find(',')
|
||||||
|
.ok_or_else(|| err!("couldn't parse instruction: {}", s))?;
|
||||||
|
let x = s[..comma].parse()?;
|
||||||
|
let s = &s[(comma + 1)..];
|
||||||
|
|
||||||
|
let space = s
|
||||||
|
.find(' ')
|
||||||
|
.ok_or_else(|| err!("couldn't parse instruction: {}", s))?;
|
||||||
|
let y = s[..space].parse()?;
|
||||||
|
let s = &s[(space + 1)..];
|
||||||
|
|
||||||
|
let begin = (x, y);
|
||||||
|
|
||||||
|
let through = s
|
||||||
|
.find("through ")
|
||||||
|
.ok_or_else(|| err!("couldn't parse instruction: {}", s))?;
|
||||||
|
let s = &s[(through + 8)..];
|
||||||
|
|
||||||
|
let comma = s
|
||||||
|
.find(',')
|
||||||
|
.ok_or_else(|| err!("couldn't parse instruction: {}", s))?;
|
||||||
|
let x = s[..comma].parse()?;
|
||||||
|
let s = &s[(comma + 1)..];
|
||||||
|
|
||||||
|
let y = s.parse()?;
|
||||||
|
|
||||||
|
let end = (x, y);
|
||||||
|
|
||||||
|
Ok(Instruction {
|
||||||
|
action,
|
||||||
|
horizontal: (begin.0, end.0),
|
||||||
|
vertical: (begin.1, end.1),
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn part1_provided() {
|
||||||
|
assert_eq!(part1("turn on 0,0 through 999,999").unwrap(), 1_000_000);
|
||||||
|
assert_eq!(part1("toggle 0,0 through 999,0").unwrap(), 1_000);
|
||||||
|
assert_eq!(part1("turn off 499,499 through 500,500").unwrap(), 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn part1_real() {
|
||||||
|
assert_eq!(part1(INPUT).unwrap(), 543903);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn part2_provided() {
|
||||||
|
assert_eq!(part2("turn on 0,0 through 0,0").unwrap(), 1);
|
||||||
|
assert_eq!(part2("toggle 0,0 through 999,999").unwrap(), 2_000_000);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn part2_real() {
|
||||||
|
assert_eq!(part2(INPUT).unwrap(), 14687245);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -3,3 +3,4 @@ pub mod day02;
|
||||||
pub mod day03;
|
pub mod day03;
|
||||||
pub mod day04;
|
pub mod day04;
|
||||||
pub mod day05;
|
pub mod day05;
|
||||||
|
pub mod day06;
|
||||||
|
|
|
||||||
|
|
@ -5,9 +5,17 @@ use aoc2015::day02;
|
||||||
use aoc2015::day03;
|
use aoc2015::day03;
|
||||||
use aoc2015::day04;
|
use aoc2015::day04;
|
||||||
use aoc2015::day05;
|
use aoc2015::day05;
|
||||||
|
use aoc2015::day06;
|
||||||
|
|
||||||
fn main() -> Result<()> {
|
fn main() -> Result<()> {
|
||||||
let days: &[fn() -> Result<()>] = &[day01::run, day02::run, day03::run, day04::run, day05::run];
|
let days: &[fn() -> Result<()>] = &[
|
||||||
|
day01::run,
|
||||||
|
day02::run,
|
||||||
|
day03::run,
|
||||||
|
day04::run,
|
||||||
|
day05::run,
|
||||||
|
day06::run,
|
||||||
|
];
|
||||||
|
|
||||||
aoc::run(days)
|
aoc::run(days)
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue