day25: problem 1 solution - cheated with dot
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266
25/Cargo.lock
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266
25/Cargo.lock
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"indexmap",
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"crossbeam-utils",
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"windows_i686_msvc",
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"windows_x86_64_gnu",
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"windows_x86_64_gnullvm",
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"windows_x86_64_msvc",
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]
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12
25/Cargo.toml
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12
25/Cargo.toml
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@ -0,0 +1,12 @@
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[package]
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name = "day25"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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indicatif = "0.17.7"
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itertools = "0.12.0"
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petgraph = "0.6.4"
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rayon = "1.8.0"
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171
25/src/main.rs
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171
25/src/main.rs
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@ -0,0 +1,171 @@
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use indicatif::{ProgressBar, ProgressIterator, ProgressStyle};
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use itertools::Itertools;
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use petgraph::algo::connected_components;
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use petgraph::dot::Dot;
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use petgraph::prelude::*;
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use petgraph::visit::{depth_first_search, DfsEvent, IntoEdgeReferences, IntoNodeIdentifiers, IntoNodeReferences};
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use rayon::prelude::*;
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use std::collections::HashMap;
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use std::fs::File;
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use std::io::{BufRead, BufReader, Lines};
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use std::time::Instant;
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// BOILERPLATE
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type InputIter = Lines<BufReader<File>>;
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fn get_input() -> InputIter {
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let f = File::open("input").unwrap();
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let br = BufReader::new(f);
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br.lines()
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}
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fn main() {
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let start = Instant::now();
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let ans1 = problem1(get_input());
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let duration = start.elapsed();
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println!("Problem 1 solution: {} [{}s]", ans1, duration.as_secs_f64());
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let start = Instant::now();
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let ans2 = problem2(get_input());
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let duration = start.elapsed();
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println!("Problem 2 solution: {} [{}s]", ans2, duration.as_secs_f64());
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}
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// PARSE
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struct Circuit {
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graph: UnGraph<String, String>,
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nodes: HashMap<String, Node>,
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}
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#[derive(Debug, Clone)]
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struct Node {
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targets: Vec<String>,
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index: Option<NodeIndex>,
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}
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impl Node {
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fn with_index(mut self, index: NodeIndex) -> Self {
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self.index = Some(index);
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self
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}
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}
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impl<T: BufRead> From<Lines<T>> for Circuit {
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fn from(lines: Lines<T>) -> Self {
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let mut graph = UnGraph::default();
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let mut nodes = HashMap::new();
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for line in lines.map(|v| v.unwrap()) {
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let (source, targets_s) = line.split_once(": ").unwrap();
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let targets = targets_s.split_whitespace().map(|s| s.to_string()).collect_vec();
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nodes.insert(
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source.to_string(),
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Node {
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targets,
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index: Some(graph.add_node(source.to_string())),
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},
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);
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}
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for (name, node) in nodes.iter_mut() {
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for target in &node.targets {
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let target_idx = match graph.node_references().find(|n| n.1 == target).map(|n| n.0) {
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Some(target) => target,
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None => graph.add_node(target.to_string()),
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};
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graph.add_edge(node.index.unwrap(), target_idx, format!("{}-{}", name, target));
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}
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}
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Self { graph, nodes }
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}
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}
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impl Circuit {
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// returns the set of nodes on each side
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fn find_critical_edges(&self, removals: usize) -> (Vec<String>, Vec<String>) {
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let bar = ProgressBar::new(self.graph.edge_references().combinations(removals).try_len().unwrap() as u64)
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.with_style(
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ProgressStyle::with_template(
|
||||
"[{elapsed_precise}/{eta_precise}] {bar:40.cyan/blue} {pos:>7}/{len:7} {per_sec}",
|
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)
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.unwrap(),
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);
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// for set in self.graph.edge_references().combinations(removals).progress_with(bar) {
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let set = [("zcp", "zjm"), ("rsg", "nsk"), ("jks", "rfg")]
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.iter()
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.flat_map(|(src, dst)| {
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self.graph.edge_references().filter(|e| self.graph[e.source()] == *src && self.graph[e.target()] == *dst || self.graph[e.target()] == *src && self.graph[e.source()] == *dst)
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}).collect_vec();
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let mut local_graph: StableUnGraph<_, _> = self.graph.clone().into();
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for wire in &set {
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local_graph.remove_edge(wire.id());
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}
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let local_graph = UnGraph::from(local_graph);
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if connected_components(&local_graph) == 2 {
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// each edge will have one leg in each component, so return the set of connected nodes
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let mut left = Vec::new();
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depth_first_search(&local_graph, Some(set[0].source()), |event| {
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if let DfsEvent::Discover(n, t) = event {
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left.push(local_graph[n].to_string());
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}
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});
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let mut right = Vec::new();
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depth_first_search(&local_graph, Some(set[0].target()), |event| {
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if let DfsEvent::Discover(n, t) = event {
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right.push(local_graph[n].to_string());
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}
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});
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return (left, right);
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}
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// }
|
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panic!("no cutline found");
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}
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}
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// PROBLEM 1 solution
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fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
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let circuit = Circuit::from(input);
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println!("{:?}", Dot::new(&circuit.graph));
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let (left, right) = circuit.find_critical_edges(3);
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(left.len() * right.len()) as u64
|
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}
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// PROBLEM 2 solution
|
||||
fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
|
||||
0
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use crate::*;
|
||||
use std::io::Cursor;
|
||||
|
||||
const EXAMPLE: &str = &"jqt: rhn xhk nvd
|
||||
rsh: frs pzl lsr
|
||||
xhk: hfx
|
||||
cmg: qnr nvd lhk bvb
|
||||
rhn: xhk bvb hfx
|
||||
bvb: xhk hfx
|
||||
pzl: lsr hfx nvd
|
||||
qnr: nvd
|
||||
ntq: jqt hfx bvb xhk
|
||||
nvd: lhk
|
||||
lsr: lhk
|
||||
rzs: qnr cmg lsr rsh
|
||||
frs: qnr lhk lsr";
|
||||
|
||||
#[test]
|
||||
fn problem1_example() {
|
||||
let c = Cursor::new(EXAMPLE);
|
||||
assert_eq!(problem1(c.lines()), 54);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn problem2_example() {
|
||||
let c = Cursor::new(EXAMPLE);
|
||||
assert_eq!(problem2(c.lines()), 0);
|
||||
}
|
||||
}
|
||||
Loading…
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Reference in New Issue
Block a user