diff options
Diffstat (limited to '22')
| -rw-r--r-- | 22/Cargo.toml | 11 | ||||
| -rw-r--r-- | 22/input | 420 | ||||
| -rw-r--r-- | 22/small | 136 | ||||
| -rw-r--r-- | 22/src/main.rs | 293 | ||||
| -rw-r--r-- | 22/tests/main.rs | 17 |
5 files changed, 877 insertions, 0 deletions
diff --git a/22/Cargo.toml b/22/Cargo.toml new file mode 100644 index 0000000..f3441a0 --- /dev/null +++ b/22/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "advent_22" +version = "0.1.0" +authors = ["Irene Knapp <ireneista@gmail.com>"] +edition = "2018" + +[dependencies] +advent_lib = { path = "../lib" } + +[dev-dependencies] +assert_cmd = "0.10" diff --git a/22/input b/22/input new file mode 100644 index 0000000..4493584 --- /dev/null +++ b/22/input @@ -0,0 +1,420 @@ +on x=-25..19,y=-17..32,z=-18..27 +on x=-16..34,y=-36..15,z=-4..44 +on x=-18..33,y=-44..10,z=-1..48 +on x=-10..44,y=-24..25,z=-45..3 +on x=-49..-2,y=-44..3,z=-35..11 +on x=-5..42,y=-48..1,z=-15..35 +on x=-26..27,y=-4..49,z=-8..44 +on x=-47..-1,y=-40..6,z=-11..40 +on x=-41..12,y=-41..9,z=-12..38 +on x=-49..4,y=-27..18,z=-12..38 +off x=11..25,y=1..10,z=-6..7 +on x=-33..17,y=-22..29,z=-8..37 +off x=-39..-27,y=11..24,z=-16..-1 +on x=-28..18,y=-39..6,z=-39..13 +off x=27..41,y=-23..-10,z=35..44 +on x=-4..40,y=1..45,z=-21..25 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+807,-499,-711 +755,-354,-619 +553,889,-390 + +--- scanner 2 --- +649,640,665 +682,-795,504 +-784,533,-524 +-644,584,-595 +-588,-843,648 +-30,6,44 +-674,560,763 +500,723,-460 +609,671,-379 +-555,-800,653 +-675,-892,-343 +697,-426,-610 +578,704,681 +493,664,-388 +-671,-858,530 +-667,343,800 +571,-461,-707 +-138,-166,112 +-889,563,-600 +646,-828,498 +640,759,510 +-630,509,768 +-681,-892,-333 +673,-379,-804 +-742,-814,-386 +577,-820,562 + +--- scanner 3 --- +-589,542,597 +605,-692,669 +-500,565,-823 +-660,373,557 +-458,-679,-417 +-488,449,543 +-626,468,-788 +338,-750,-386 +528,-832,-391 +562,-778,733 +-938,-730,414 +543,643,-506 +-524,371,-870 +407,773,750 +-104,29,83 +378,-903,-323 +-778,-728,485 +426,699,580 +-438,-605,-362 +-469,-447,-387 +509,732,623 +647,635,-688 +-868,-804,481 +614,-800,639 +595,780,-596 + +--- scanner 4 --- +727,592,562 +-293,-554,779 +441,611,-461 +-714,465,-776 +-743,427,-804 +-660,-479,-426 +832,-632,460 +927,-485,-438 +408,393,-506 +466,436,-512 +110,16,151 +-258,-428,682 +-393,719,612 +-211,-452,876 +808,-476,-593 +-575,615,604 +-485,667,467 +-680,325,-822 +-627,-443,-432 +872,-547,-609 +833,512,582 +807,604,487 +839,-516,451 +891,-625,532 +-652,-548,-490 +30,-46,-14 diff --git a/22/src/main.rs b/22/src/main.rs new file mode 100644 index 0000000..bc61faf --- /dev/null +++ b/22/src/main.rs @@ -0,0 +1,293 @@ +use advent_lib::prelude::*; + + +#[derive(Debug, Clone)] +struct Step { + set_to: bool, + min: Point, + max: Point, +} + +#[derive(Debug, Clone)] +struct Region { + min: Point, + max: Point, +} + +#[derive(Debug, Clone)] +struct Point { + x: i64, + y: i64, + z: i64, +} + +#[derive(Debug, Clone, Eq, PartialEq)] +struct Span { + min: i64, + max: i64, +} + + +fn main() -> Result<()> { + let mut args = std::env::args(); + if args.len() != 2 { + eprintln!("Usage: advent input"); + } + let _ = args.next(); + let filename = args.next().unwrap(); + + let input = advent_lib::read_lines_file(&filename)?; + + let mut directions = Vec::new(); + for line in &input { + let mut step = Step { + set_to: false, + min: Point { x: 0, y: 0, z: 0 }, + max: Point { x: 0, y: 0, z: 0 }, + }; + + let words: Vec<&str> = line.split_whitespace().collect(); + + step.set_to = match words[0] { + "on" => true, + "off" => false, + _ => panic!("hm"), + }; + + let components: Vec<&str> = words[1].split(",").collect(); + + let parts: Vec<&str> = components[0].split("=").collect(); + let ends: Vec<&str> = parts[1].split("..").collect(); + step.min.x = ends[0].parse::<i64>().unwrap(); + step.max.x = ends[1].parse::<i64>().unwrap(); + + let parts: Vec<&str> = components[1].split("=").collect(); + let ends: Vec<&str> = parts[1].split("..").collect(); + step.min.y = ends[0].parse::<i64>().unwrap(); + step.max.y = ends[1].parse::<i64>().unwrap(); + + let parts: Vec<&str> = components[2].split("=").collect(); + let ends: Vec<&str> = parts[1].split("..").collect(); + step.min.z = ends[0].parse::<i64>().unwrap(); + step.max.z = ends[1].parse::<i64>().unwrap(); + + directions.push(step); + } + + let mut total_on = 0; + for x in -50 .. 51 { + for y in -50 .. 51 { + for z in -50 .. 51 { + let point = Point { x, y, z }; + if test_cube(&point, &directions) { + total_on += 1; + } + } + } + } + + println!("{}", total_on); + + let total_on_everywhere = count_everywhere(&directions); + println!("{}", total_on_everywhere); + + Ok(()) +} + + +fn test_cube(point: &Point, directions: &Vec<Step>) -> bool { + for step in directions.iter().rev() { + if (point.x >= step.min.x) && (point.y >= step.min.y) + && (point.z >= step.min.z) && (point.x <= step.max.x) + && (point.y <= step.max.y) && (point.z <= step.max.z) + { + return step.set_to; + } + } + + false +} + + +fn count_everywhere(directions: &Vec<Step>) -> i64 { + let mut lit_regions: Vec<Region> = Vec::new(); + + for step in directions { + if lit_regions.len() == 0 { + if step.set_to { + lit_regions.push(Region { + min: step.min.clone(), + max: step.max.clone(), + }); + } + continue; + } + + let mut new_lit_regions = Vec::new(); + for lit_region in lit_regions.into_iter() { + /* Depending on whether set_to is true or false, we may be doing union + * or difference. However, we implement union as difference followed by + * also including the entire subtracted volume. So difference is the + * only operation that needs the per-axis breakdown of cases. + * + * Start by determining whether it's overlapping or not. The + * non-overlapping cases are: + * + * A==========B (lit region) + * C=========D (step) + * + * A=========B (lit region) + * C==========D (step) + * + * Now eliminate cases where the step entirely covers the lit region: + * + * A======B (lit region) + * C==================D (step) + * + * The following cases remain: + * + * A==================B (lit region) + * C======D (step) + * + * A==========B (lit region) + * C=====.......? (step) + * + * A==========B (lit region) + * ?......=====D (step) + */ + let mut lit_spans = Vec::new(); + let mut step_spans = Vec::new(); + let mut differenced_spans = Vec::new(); + for axis in 0 .. 3 { + let mut relevant_spans = Vec::new(); + + let (lit_min, lit_max, step_min, step_max) = match axis { + 0 => { (lit_region.min.x, lit_region.max.x, step.min.x, step.max.x) }, + 1 => { (lit_region.min.y, lit_region.max.y, step.min.y, step.max.y) }, + 2 => { (lit_region.min.z, lit_region.max.z, step.min.z, step.max.z) }, + _ => { panic!("run in circles scream and shout"); }, + }; + + lit_spans.push(Span { min: lit_min, max: lit_max }); + step_spans.push(Span { min: step_min, max: step_max }); + + if (lit_max < step_min) || (lit_min > step_max) { + // Non-overlapping + relevant_spans.push(Span { min: lit_min, max: lit_max }); + } else if (step_min <= lit_min) && (step_max >= lit_max) { + // Step entirely covers lit + // It is intentional that nothing is done here. + } else if (lit_min < step_min) && (lit_max > step_max) { + // Step is a segment in the middle of lit + relevant_spans.push(Span { min: lit_min, max: step_min - 1 }); + relevant_spans.push(Span { min: step_max + 1, max: lit_max }); + } else if lit_min < step_min { + relevant_spans.push(Span { min: lit_min, max: step_min - 1 }); + } else { + relevant_spans.push(Span { min: step_max + 1, max: lit_max }); + } + + differenced_spans.push(relevant_spans); + } + + if ((differenced_spans[0].len() == 1) + && (differenced_spans[0][0] == lit_spans[0])) + || ((differenced_spans[1].len() == 1) + && (differenced_spans[1][0] == lit_spans[1])) + || ((differenced_spans[2].len() == 1) + && (differenced_spans[2][0] == lit_spans[2])) + { + new_lit_regions.push(Region { + min: Point { + x: lit_spans[0].min, + y: lit_spans[1].min, + z: lit_spans[2].min, + }, + max: Point { + x: lit_spans[0].max, + y: lit_spans[1].max, + z: lit_spans[2].max, + }, + }); + } else { + for z_span in &differenced_spans[2] { + let region = Region { + min: Point { + x: lit_spans[0].min, + y: lit_spans[1].min, + z: z_span.min, + }, + max: Point { + x: lit_spans[0].max, + y: lit_spans[1].max, + z: z_span.max, + }, + }; + new_lit_regions.push(region); + } + + let z_min = std::cmp::max(lit_spans[2].min, step_spans[2].min); + let z_max = std::cmp::min(lit_spans[2].max, step_spans[2].max); + + for y_span in &differenced_spans[1] { + let region = Region { + min: Point { + x: lit_spans[0].min, + y: y_span.min, + z: z_min, + }, + max: Point { + x: lit_spans[0].max, + y: y_span.max, + z: z_max, + }, + }; + new_lit_regions.push(region); + } + + let y_min = std::cmp::max(lit_spans[1].min, step_spans[1].min); + let y_max = std::cmp::min(lit_spans[1].max, step_spans[1].max); + + for x_span in &differenced_spans[0] { + let region = Region { + min: Point { + x: x_span.min, + y: y_min, + z: z_min, + }, + max: Point { + x: x_span.max, + y: y_max, + z: z_max, + }, + }; + new_lit_regions.push(region); + } + } + + } + + if step.set_to { + let region = Region { + min: step.min.clone(), + max: step.max.clone(), + }; + new_lit_regions.push(region); + } + + + lit_regions = new_lit_regions; + } + + let mut total_lit = 0; + for region in &lit_regions { + let x_extent = region.max.x - region.min.x + 1; + let y_extent = region.max.y - region.min.y + 1; + let z_extent = region.max.z - region.min.z + 1; + let volume = x_extent * y_extent * z_extent; + total_lit += volume; + } + + total_lit +} + diff --git a/22/tests/main.rs b/22/tests/main.rs new file mode 100644 index 0000000..5012dd4 --- /dev/null +++ b/22/tests/main.rs @@ -0,0 +1,17 @@ +use assert_cmd::prelude::*; +//use predicates::prelude::*; +use std::process::Command; + + +#[test] +fn personal_input() -> Result<(), Box<dyn std::error::Error>> { + let mut command = Command::cargo_bin("advent_22")?; + + command.arg("input"); + command.assert().success().stdout( + "612714\n\ + 1311612259117092\n"); + + Ok(()) +} + |