From b35073f5b53c75acf7e1106f39b45b3e57ca3255 Mon Sep 17 00:00:00 2001 From: Acvaxoort Date: Tue, 5 Dec 2023 17:24:51 +0100 Subject: [PATCH] day 5 --- day5/Cargo.lock | 7 ++ day5/Cargo.toml | 8 ++ day5/input.txt | 239 +++++++++++++++++++++++++++++++++++++++++++++++ day5/src/main.rs | 116 +++++++++++++++++++++++ 4 files changed, 370 insertions(+) create mode 100644 day5/Cargo.lock create mode 100644 day5/Cargo.toml create mode 100644 day5/input.txt create mode 100644 day5/src/main.rs diff --git a/day5/Cargo.lock b/day5/Cargo.lock new file mode 100644 index 0000000..7a62bb0 --- /dev/null +++ b/day5/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "day5" +version = "0.1.0" diff --git a/day5/Cargo.toml b/day5/Cargo.toml new file mode 100644 index 0000000..f9b62bf --- /dev/null +++ b/day5/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "day5" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] diff --git a/day5/input.txt b/day5/input.txt new file mode 100644 index 0000000..d15bf54 --- /dev/null +++ b/day5/input.txt @@ -0,0 +1,239 @@ +seeds: 929142010 467769747 2497466808 210166838 3768123711 33216796 1609270159 86969850 199555506 378609832 1840685500 314009711 1740069852 36868255 2161129344 170490105 2869967743 265455365 3984276455 31190888 + +seed-to-soil map: +3788621315 24578909 268976974 +3633843608 2672619957 154777707 +1562003446 2827397664 767899879 +2618130896 293555883 1015712712 +178572254 3595297543 462300746 +640873000 1553961386 921130446 +2373438105 1435027522 118933864 +2492371969 1309268595 125758927 +2329903325 2629085177 43534780 +24578909 2475091832 153993345 + +soil-to-fertilizer map: +3438795585 3489901885 246180709 +2207634271 2882741084 20404178 +2921657379 3093830975 5578539 +3684976294 494116589 47356386 +3924272359 3740035076 65483093 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str.split_whitespace().filter_map(|substr| substr.parse::().ok()).collect(); +} + +fn process(seeds: Vec, mut maps: Vec>) -> (u32, u32) { + for map in maps.iter_mut() { + map.sort_unstable_by(|&(a, _, _), &(b, _, _)| a.partial_cmp(&b).unwrap()); + } + // Task 1 - mapping a single number through all mappings + let min1 = seeds.iter().map( + |seed| { + let mut n = *seed; + for map in &maps { + for &(src, dst, len) in map { + if src > n { + break; + } + if n - src < len { + n = n - src + dst; + break; + } + } + } + n + } + ).min().unwrap(); + + // Task 2 - mapping whole ranges through all mappings + // Array of ranges that will be mapped for task 2 initialized with pairs from seeds + let mut processed_ranges: Vec<_> = (0..seeds.len()).step_by(2).map(|i| (seeds[i], seeds[i + 1])).collect(); + let mut swap_ranges: Vec<(u32, u32)> = Vec::new(); + // Map the processed_ranged through all mappings + for map in &maps { + swap_ranges.clear(); + for &(working_start, working_len) in &processed_ranges { + // Applying one or more mapping ranges to the processed range + let (mut temp_start, mut temp_len) = (working_start, working_len); + for &(src, dst, len) in map { + // Working range starts before mapping range, means it's an unmapped segment + if temp_start < src { + let out_len = cmp::min(temp_len, src - temp_start); + swap_ranges.push((temp_start, out_len)); + if out_len == temp_len { + break; + } + temp_start = src; + } + // Working range is sure to not begin before mapping range + let start_diff = temp_start - src; + // Mapping range is so short that it doesn't reach the working range, skip + if len <= start_diff { + continue; + } + let out_len = cmp::min(temp_len, len - start_diff); + swap_ranges.push((dst + start_diff, out_len)); + if out_len == temp_len { + break; + } + // Consume the beginning of the working range + temp_start += out_len; + temp_len -= out_len; + } + } + std::mem::swap(&mut processed_ranges, &mut swap_ranges); + } + // Find the range with lowest starting value, length is guaranteed to be nonzero + let min2 = processed_ranges.iter().map(|&(start, _)| start).min().unwrap(); + (min1, min2) +} + +fn main() { + let time_start = Instant::now(); + // Set of inputs + let mut seeds: Vec = Vec::new(); + // Mappings of ranges, ordered in order to easily find the lowest relevant range + // Order: (src, dst, len) + let mut maps: Vec> = Vec::new(); + maps.push(Vec::new()); + let mut did_read_seeds: bool = false; + for line in read_to_string("input.txt").unwrap().lines() { + if !did_read_seeds { + seeds = get_numbers_in_line(line); + did_read_seeds = true; + } else { + let numbers = get_numbers_in_line(line); + if numbers.len() == 3 { + maps.last_mut().unwrap().push((numbers[1],numbers[0], numbers[2])); + } else { + if !maps.last().unwrap().is_empty() { + maps.push(Vec::new()); + } + } + } + } + if maps.last().unwrap().is_empty() { + maps.pop(); + } + let time_start_no_io = Instant::now(); + + // for _ in 0..1000 { + // let (_, _) = process(seeds.clone(), maps.clone()); + // } + let (min1, min2) = process(seeds, maps); + + // Measurements + let elapsed = time_start.elapsed().as_nanos(); + let elapsed_no_io = time_start_no_io.elapsed().as_nanos(); + println!("Time: {}ns", elapsed); + println!("Time without file i/o: {}ns", elapsed_no_io); + println!("Min location1: {}", min1); + println!("Min location2: {}", min2); +}