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|
use aoc2019::*;
use rpds::list;
use rpds::list::List;
use rpds::RedBlackTreeMap;
use std::fmt;
use std::io;
use std::io::prelude::*;
use std::iter;
use std::process;
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
#[structopt(name = "Day 11: Space Police")]
/// Calculates how many blocks a painting robot would paint.
///
/// Takes the program to run on the robot in on stdin.
///
/// See https://adventofcode.com/2019/day/11 for details.
struct Opt {
/// debug mode prints the size of the painted area on a black background
#[structopt(short = "d", long = "debug")]
debug: bool,
}
fn main() {
let opt = Opt::from_args();
let stdin = io::stdin();
let program: IntcodeProgram = stdin
.lock()
.split(b',')
.map(|x| exit_on_failed_assertion(x, "Error reading input"))
.map(|x| exit_on_failed_assertion(String::from_utf8(x), "Input was not valid UTF-8"))
.map(|x| exit_on_failed_assertion(x.trim().parse::<Intcode>(), "Invalid number"))
.collect::<IntcodeProgram>();
let finished_robot = exit_on_failed_assertion(
Robot::new(program, !opt.debug).execute(),
"Robot encountered an error",
);
if opt.debug {
println!("{}", finished_robot.canvas.size());
} else {
println!("{}", finished_robot);
}
}
fn exit_on_failed_assertion<A, E: std::error::Error>(data: Result<A, E>, message: &str) -> A {
match data {
Ok(data) => data,
Err(e) => {
eprintln!("{}: {}", message, e);
process::exit(1);
}
}
}
#[derive(Debug, Clone)]
struct Robot {
program: IntcodeProgram,
position: (i32, i32),
facing: Direction,
canvas: RedBlackTreeMap<(i32, i32), bool>,
background: bool,
}
impl fmt::Display for Robot {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
(self.min_white_y()..=self.max_white_y())
.map(move |y| {
(self.min_white_x()..=self.max_white_x())
.map(move |x| (x, y))
.map(|coord| self.canvas.get(&coord).cloned().unwrap_or(self.background))
.map(|c| write!(f, "{}", if c { '#' } else { ' ' }))
.collect::<fmt::Result>()
.and_then(|_| writeln!(f, ""))
})
.collect()
}
}
#[derive(Debug, Clone)]
enum Direction {
Up,
Down,
Left,
Right,
}
impl Robot {
fn new(program: IntcodeProgram, background: bool) -> Robot {
Robot {
program: program.run_to_termination_or_input(),
position: (0, 0),
facing: Direction::Up,
canvas: RedBlackTreeMap::new(),
background,
}
}
fn execute(&self) -> Result<Robot, IntcodeProgramError> {
iter::successors(Some(self.clone()), |robot| Some(robot.next()))
.find(|robot| {
robot.program.error.is_some()
|| (robot.program.halted && robot.program.output.is_empty())
})
.unwrap() // infinite iterator won't terminate unless this is Some
.as_result()
}
fn as_result(&self) -> Result<Robot, IntcodeProgramError> {
match self.program.error {
Some(ref error) => Err(error.clone()),
None => Ok(self.clone()),
}
}
fn next(&self) -> Robot {
match (
self.program.output.get(0).map(intcode_to_bool),
self.program.output.get(1).map(intcode_to_bool),
) {
(Some(paint), Some(rot)) => Robot {
program: self
.program
.with_cleared_output()
.with_input(list![bool_to_intcode(
self.canvas
.get(&self.facing.rotate(rot).move_position(self.position))
.cloned()
.unwrap_or(self.background),
)])
.run_to_termination_or_input(),
position: self.facing.rotate(rot).move_position(self.position),
facing: self.facing.rotate(rot),
canvas: self.canvas.insert(self.position, paint),
background: self.background,
},
_ => Robot {
program: self
.program
.with_input(list![bool_to_intcode(
self.canvas
.get(&self.position)
.cloned()
.unwrap_or(self.background),
)])
.run_to_termination_or_input(),
..self.clone()
},
}
}
fn min_white_x(&self) -> i32 {
self.white_blocks().map(|(x, _y)| x).min().unwrap_or(0)
}
fn min_white_y(&self) -> i32 {
self.white_blocks().map(|(_x, y)| y).min().unwrap_or(0)
}
fn max_white_x(&self) -> i32 {
self.white_blocks().map(|(x, _y)| x).max().unwrap_or(0)
}
fn max_white_y(&self) -> i32 {
self.white_blocks().map(|(_x, y)| y).max().unwrap_or(0)
}
fn white_blocks<'a>(&'a self) -> impl 'a + Iterator<Item = (i32, i32)> {
self.canvas
.iter()
.filter(|(_, val)| **val)
.map(|(coord, _)| coord)
.cloned()
}
}
impl Direction {
fn rotate(&self, clockwise: bool) -> Direction {
use Direction::*;
if clockwise {
match self {
Up => Right,
Right => Down,
Down => Left,
Left => Up,
}
} else {
match self {
Up => Left,
Left => Down,
Down => Right,
Right => Up,
}
}
}
fn move_position(&self, position: (i32, i32)) -> (i32, i32) {
use Direction::*;
match self {
Up => (position.0, position.1 + 1),
Down => (position.0, position.1 - 1),
Left => (position.0 - 1, position.1),
Right => (position.0 + 1, position.1),
}
}
}
|
