Added up day 15
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0506DB2A1CC75C27
105
src/day15/1.rs
105
src/day15/1.rs
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#![feature(test)]
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use std::collections::HashSet;
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extern crate test;
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const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
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#[derive(Debug)]
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struct Sensor {
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sx: i32,
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sy: i32,
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bx: i32,
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by: i32,
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}
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fn parse(input: &str) -> Vec<Sensor> {
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input
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.lines()
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.filter(|c| !c.is_empty())
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.filter_map(|line| {
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line.split_once(':').map(|(sensor, beacon)| {
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let (sx, sy) = sensor
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.split_once(',')
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.map(|(x, y)| {
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let xneg = x.contains('-');
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let yneg = y.contains('-');
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let x = x
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i32);
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let y = y
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i32);
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(if xneg { -x } else { x }, if yneg { -y } else { y })
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})
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.unwrap();
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let (bx, by) = beacon
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.split_once(',')
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.map(|(x, y)| {
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let xneg = x.contains('-');
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let yneg = y.contains('-');
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let x = x
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i32);
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let y = y
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i32);
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(if xneg { -x } else { x }, if yneg { -y } else { y })
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})
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.unwrap();
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Sensor { sx, sy, bx, by }
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})
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})
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.collect()
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}
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fn solution(mut input: Vec<Sensor>, line: i32) -> usize {
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let mut beacons = HashSet::new();
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let mut set = HashSet::new();
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input.sort_unstable_by_key(|c| c.sx);
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for Sensor { sx, sy, bx, by } in input {
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if by == line {
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beacons.insert(bx);
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}
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let area = (bx - sx).abs() + (by - sy).abs();
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for ix in sx - area..=sx + area {
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if inside((sx, sy), (ix, line)) <= area {
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set.insert(ix);
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};
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}
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}
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set.len() - beacons.len()
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}
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#[inline]
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const fn inside((sx, sy): (i32, i32), (px, py): (i32, i32)) -> i32 {
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(sx - px).abs() + (sy - py).abs()
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}
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fn main() {
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let output = parse(INPUTS[0]);
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let score = solution(output, 10);
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println!("{}", score);
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let output = parse(INPUTS[1]);
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let score = solution(output, 2000000);
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println!("{}", score);
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}
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#[bench]
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fn solution_bench(b: &mut test::Bencher) {
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b.iter(|| {
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let input = parse(INPUTS[1]);
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let result = solution(input, 2000000);
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test::black_box(result);
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})
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}
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106
src/day15/2.rs
106
src/day15/2.rs
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#![feature(test)]
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extern crate test;
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const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
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#[derive(Debug)]
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struct Sensor {
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sx: i64,
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sy: i64,
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area: i64,
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}
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fn parse(input: &str) -> Vec<Sensor> {
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input
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.lines()
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.filter(|c| !c.is_empty())
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.filter_map(|line| {
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line.split_once(':').map(|(sensor, beacon)| {
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let (sx, sy) = sensor
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.split_once(',')
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.map(|(x, y)| {
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let xneg = x.contains('-');
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let yneg = y.contains('-');
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let x = x
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i64);
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let y = y
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i64);
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(if xneg { -x } else { x }, if yneg { -y } else { y })
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})
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.unwrap();
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let (bx, by) = beacon
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.split_once(',')
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.map(|(x, y)| {
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let xneg = x.contains('-');
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let yneg = y.contains('-');
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let x = x
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i64);
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let y = y
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.bytes()
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.filter(|c| (b'0'..=b'9').contains(c))
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.fold(0, |a, x| (a * 10) + (x - b'0') as i64);
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(if xneg { -x } else { x }, if yneg { -y } else { y })
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})
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.unwrap();
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Sensor {
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sx,
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sy,
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area: (sx - bx).abs() + (sy - by).abs(),
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}
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})
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})
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.collect()
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}
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fn solution(input: Vec<Sensor>, line: i64) -> i64 {
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for j in 0..=line {
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let mut i = 0;
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'out: while i <= line {
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for beacon in input.iter() {
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if inside((beacon.sx, beacon.sy), (i, j)) <= beacon.area {
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let dy = (j - beacon.sy).abs();
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let dx = (beacon.sx - i) + (beacon.area - dy) + 1;
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i += dx;
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continue 'out;
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}
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}
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return i * 4000000 + j;
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}
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}
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0
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}
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#[inline]
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const fn inside((sx, sy): (i64, i64), (px, py): (i64, i64)) -> i64 {
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(sx - px).abs() + (sy - py).abs()
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}
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fn main() {
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let output = parse(INPUTS[0]);
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let score = solution(output, 20);
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println!("{}", score);
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let output = parse(INPUTS[1]);
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let score = solution(output, 4000000);
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println!("{}", score);
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}
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#[bench]
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fn solution_bench(b: &mut test::Bencher) {
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b.iter(|| {
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let input = parse(INPUTS[1]);
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let result = solution(input, 4000000);
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test::black_box(result);
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})
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}
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38
src/day15/input.txt
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38
src/day15/input.txt
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Sensor at x=220580, y=684270: closest beacon is at x=436611, y=263737
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Sensor at x=3329538, y=3016377: closest beacon is at x=3355914, y=2862466
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Sensor at x=2605308, y=2023938: closest beacon is at x=2197530, y=2271330
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Sensor at x=1810202, y=3423309: closest beacon is at x=1829362, y=3182862
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Sensor at x=480296, y=3999646: closest beacon is at x=1694700, y=4178942
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Sensor at x=46556, y=1283362: closest beacon is at x=-91140, y=1441882
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Sensor at x=3741660, y=3959257: closest beacon is at x=3537901, y=3368697
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Sensor at x=3399994, y=700264: closest beacon is at x=3748004, y=2000000
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Sensor at x=1531981, y=3801761: closest beacon is at x=1694700, y=4178942
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Sensor at x=193367, y=2712458: closest beacon is at x=-91140, y=1441882
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Sensor at x=3199067, y=2194575: closest beacon is at x=3748004, y=2000000
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Sensor at x=1878117, y=2578817: closest beacon is at x=2197530, y=2271330
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Sensor at x=2439089, y=3168242: closest beacon is at x=1829362, y=3182862
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Sensor at x=273443, y=171076: closest beacon is at x=436611, y=263737
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Sensor at x=3680413, y=2477027: closest beacon is at x=3748004, y=2000000
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Sensor at x=3620241, y=2904998: closest beacon is at x=3355914, y=2862466
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Sensor at x=1728351, y=2895399: closest beacon is at x=1829362, y=3182862
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Sensor at x=1894207, y=1168355: closest beacon is at x=2197530, y=2271330
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Sensor at x=856867, y=3271314: closest beacon is at x=1829362, y=3182862
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Sensor at x=3056788, y=2626224: closest beacon is at x=3355914, y=2862466
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Sensor at x=3598024, y=3322247: closest beacon is at x=3537901, y=3368697
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Sensor at x=1662543, y=3128823: closest beacon is at x=1829362, y=3182862
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Sensor at x=3992558, y=1933059: closest beacon is at x=3748004, y=2000000
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Sensor at x=1844282, y=2994285: closest beacon is at x=1829362, y=3182862
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Sensor at x=3604375, y=3668021: closest beacon is at x=3537901, y=3368697
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Sensor at x=2569893, y=3911832: closest beacon is at x=1694700, y=4178942
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Sensor at x=117970, y=37503: closest beacon is at x=436611, y=263737
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Sensor at x=3951385, y=3125577: closest beacon is at x=3537901, y=3368697
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Sensor at x=2482373, y=2648092: closest beacon is at x=2197530, y=2271330
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Sensor at x=915040, y=1835970: closest beacon is at x=-91140, y=1441882
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Sensor at x=3047883, y=3301452: closest beacon is at x=3537901, y=3368697
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Sensor at x=117432, y=1503889: closest beacon is at x=-91140, y=1441882
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Sensor at x=1136011, y=261705: closest beacon is at x=436611, y=263737
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Sensor at x=2343111, y=66183: closest beacon is at x=2081841, y=-807749
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Sensor at x=608229, y=955721: closest beacon is at x=436611, y=263737
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Sensor at x=1189379, y=3999750: closest beacon is at x=1694700, y=4178942
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Sensor at x=766640, y=26597: closest beacon is at x=436611, y=263737
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Sensor at x=3891093, y=2110588: closest beacon is at x=3748004, y=2000000
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14
src/day15/sample.txt
Normal file
14
src/day15/sample.txt
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Sensor at x=2, y=18: closest beacon is at x=-2, y=15
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Sensor at x=9, y=16: closest beacon is at x=10, y=16
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Sensor at x=13, y=2: closest beacon is at x=15, y=3
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Sensor at x=12, y=14: closest beacon is at x=10, y=16
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Sensor at x=10, y=20: closest beacon is at x=10, y=16
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Sensor at x=14, y=17: closest beacon is at x=10, y=16
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Sensor at x=8, y=7: closest beacon is at x=2, y=10
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Sensor at x=2, y=0: closest beacon is at x=2, y=10
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Sensor at x=0, y=11: closest beacon is at x=2, y=10
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Sensor at x=20, y=14: closest beacon is at x=25, y=17
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Sensor at x=17, y=20: closest beacon is at x=21, y=22
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Sensor at x=16, y=7: closest beacon is at x=15, y=3
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Sensor at x=14, y=3: closest beacon is at x=15, y=3
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Sensor at x=20, y=1: closest beacon is at x=15, y=3
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