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use aoc2019::*;
use rpds::vector::Vector;
use rpds::RedBlackTreeMap;
use std::io;
use std::io::prelude::*;
use std::process;
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
#[structopt(name = "Day 13: Care Package")]
/// Executes an Intcode game
///
/// The program is read from stdin as a series of comma-separated
/// values. Newlines are ignored.
///
/// See https://adventofcode.com/2019/day/13 for details.
struct Opt {
#[structopt(short = "i", long = "input")]
input: Vec<Intcode>,
}
fn main() {
let stdin = io::stdin();
let opt = Opt::from_args();
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>()
.with_input(opt.input.into_iter().collect());
let result = exit_on_failed_assertion(program.execute(), "Program errored");
println!("{}", count_blocks(result));
}
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);
}
}
}
fn render_screen(output: Vector<Intcode>) -> RedBlackTreeMap<(Intcode, Intcode), Intcode> {
(0..output.len() / 3)
.map(|i| i * 3)
.map(|i| {
(
output[i].clone(),
output[i + 1].clone(),
output[i + 2].clone(),
)
})
.fold(RedBlackTreeMap::new(), |acc, (x, y, tile)| {
acc.insert((x, y), tile)
})
}
fn count_blocks(output: Vector<Intcode>) -> usize {
render_screen(output)
.values()
.filter(|val| **val == Intcode::from(2))
.count()
}
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