thallada/advent-of-code-2019
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Completed day 10 part 2

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This commit is contained in:
Tyler Hallada 2020-01-02 22:53:45 -05:00
parent e007f0b3f9
commit c68eee28c7
2 changed files with 10 additions and 17 deletions
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5
day10/input/test6.txt Normal file
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@ -0,0 +1,5 @@
.#....#####...#..
##...##.#####..##
##...#...#.#####.
..#.....X...###..
..#.#.....#....##

22
day10/src/main.rs
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@ -3,7 +3,6 @@ use std::collections::{HashMap, VecDeque};
use std::error::Error; use std::error::Error;
use std::fs::File; use std::fs::File;
use std::io::{prelude::*, BufReader}; use std::io::{prelude::*, BufReader};
use std::iter::FromIterator;
use std::result; use std::result;
use num::integer::gcd; use num::integer::gcd;
@ -97,33 +96,22 @@ impl AsteroidField {
let mut lines_of_sight = self.get_lines_of_sight(laser_point); let mut lines_of_sight = self.get_lines_of_sight(laser_point);
let mut directions: Vec<(i32, i32)> = lines_of_sight.keys().map(|key| *key).collect(); let mut directions: Vec<(i32, i32)> = lines_of_sight.keys().map(|key| *key).collect();
directions.sort_by(|a, b| { directions.sort_by(|a, b| {
let det = a.0 * b.1 - b.0 * a.1; let a_deg = (a.1 as f32).atan2(a.0 as f32);
if det > 0 { let b_deg = (b.1 as f32).atan2(b.0 as f32);
Ordering::Less a_deg.partial_cmp(&b_deg).unwrap_or(Ordering::Equal)
} else if det < 0 {
Ordering::Greater
} else {
Ordering::Equal
}
}); });
let up = directions let up = directions
.iter() .iter()
.position(|&dir| dir == (0, -1)) .position(|&dir| dir == (0, -1))
.expect("No asteroid directly up from laser"); .expect("No asteroid directly up from laser");
directions.rotate_left(up); directions.rotate_left(up);
dbg!(&directions);
for direction in directions.iter() { for direction in directions.iter() {
// dbg!(direction);
let in_sight = lines_of_sight.get_mut(direction); let in_sight = lines_of_sight.get_mut(direction);
if let Some(in_sight) = in_sight { if let Some(in_sight) = in_sight {
// dbg!(&in_sight);
if let Some(vaporized_asteroid) = in_sight.pop_back() { if let Some(vaporized_asteroid) = in_sight.pop_back() {
vaporized_counter += 1; vaporized_counter += 1;
// dbg!(&vaporized_counter);
// dbg!(&vaporized_asteroid);
if vaporized_counter == 200 { if vaporized_counter == 200 {
return Some(vaporized_asteroid); return Some(vaporized_asteroid);
} }
@ -157,8 +145,8 @@ fn solve_part1() -> Result<usize> {
} }
fn solve_part2() -> Result<usize> { fn solve_part2() -> Result<usize> {
let mut asteroid_field = read_asteroid_field("input/test5.txt")?; let mut asteroid_field = read_asteroid_field(INPUT)?;
let vaporized200 = asteroid_field.vaporize_asteroids(&Point { x: 11, y: 13 }).unwrap(); let vaporized200 = asteroid_field.vaporize_asteroids(&Point { x: 22, y: 25 }).unwrap();
Ok(vaporized200.x * 100 + vaporized200.y) Ok(vaporized200.x * 100 + vaporized200.y)
} }