day7: parallel solution, < 100ms
This is definitely a problem that calls for DFS, but I couldn't be bothered.
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69
7/Cargo.lock
generated
69
7/Cargo.lock
generated
@ -2,11 +2,44 @@
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "cfg-if"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "crossbeam-deque"
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version = "0.8.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
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dependencies = [
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"crossbeam-epoch",
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"crossbeam-utils",
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]
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[[package]]
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name = "crossbeam-epoch"
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version = "0.9.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
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dependencies = [
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"crossbeam-utils",
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]
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[[package]]
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name = "crossbeam-utils"
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version = "0.8.20"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "22ec99545bb0ed0ea7bb9b8e1e9122ea386ff8a48c0922e43f36d45ab09e0e80"
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[[package]]
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name = "day7"
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version = "0.1.0"
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dependencies = [
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"itertools",
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"rayon",
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"thread_local",
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]
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[[package]]
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@ -23,3 +56,39 @@ checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
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dependencies = [
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"either",
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]
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[[package]]
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name = "once_cell"
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version = "1.20.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
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[[package]]
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name = "rayon"
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version = "1.10.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b418a60154510ca1a002a752ca9714984e21e4241e804d32555251faf8b78ffa"
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dependencies = [
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"either",
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"rayon-core",
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]
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[[package]]
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name = "rayon-core"
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version = "1.12.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1465873a3dfdaa8ae7cb14b4383657caab0b3e8a0aa9ae8e04b044854c8dfce2"
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dependencies = [
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"crossbeam-deque",
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"crossbeam-utils",
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]
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[[package]]
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name = "thread_local"
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version = "1.1.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8b9ef9bad013ada3808854ceac7b46812a6465ba368859a37e2100283d2d719c"
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dependencies = [
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"cfg-if",
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"once_cell",
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]
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@ -5,3 +5,5 @@ edition = "2021"
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[dependencies]
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itertools = "0.13.0"
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rayon = "1.10.0"
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thread_local = "1.1.8"
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103
7/src/main.rs
103
7/src/main.rs
@ -3,6 +3,8 @@ use std::io::{BufRead, BufReader, Lines};
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use std::time::{Duration, Instant};
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use itertools::Itertools;
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use rayon::iter::{IntoParallelIterator, IntoParallelRefIterator, ParallelIterator};
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use thread_local::ThreadLocal;
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// BOILERPLATE
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type InputIter = Lines<BufReader<File>>;
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@ -36,7 +38,7 @@ fn main() {
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println!("Total duration: {}", duration_format(duration1 + duration2));
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}
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#[derive(Debug)]
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#[derive(Debug, Clone)]
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struct Calibration {
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result: u64,
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numbers: Vec<u64>,
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@ -55,9 +57,10 @@ impl From<&str> for Calibration {
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#[derive(Debug)]
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struct Calibrations {
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cals: Vec<Calibration>,
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longest_cal: usize,
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}
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#[derive(Debug)]
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#[derive(Debug, Copy, Clone)]
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enum Operator {
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Add,
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Multiply,
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@ -69,7 +72,7 @@ impl Operator {
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match self {
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Operator::Add => a + b,
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Operator::Multiply => a * b,
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Operator::Concatenate => u64::pow(10, b.to_string().len() as u32) * a + b,
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Operator::Concatenate => u64::pow(10, u64::ilog10(b) + 1) * a + b,
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}
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}
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}
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@ -77,10 +80,55 @@ impl Operator {
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impl<T: BufRead> From<Lines<T>> for Calibrations {
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fn from(input: Lines<T>) -> Self {
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let mut cals = Vec::new();
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let mut longest_cal = 0;
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for line in input.map(|l| l.unwrap()) {
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cals.push(line.as_str().into());
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let cal: Calibration = line.as_str().into();
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longest_cal = std::cmp::max(longest_cal, cal.numbers.len());
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cals.push(cal);
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}
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Self { cals }
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Self { cals, longest_cal }
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}
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}
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impl Calibrations {
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fn make_operator_sets(operators: &[Operator], n_opers: usize) -> Vec<Vec<Vec<Operator>>> {
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(0..n_opers)
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.map(|k| {
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std::iter::repeat_n(operators.iter().map(|v| *v), k)
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.multi_cartesian_product()
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.collect()
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})
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.collect()
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}
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fn check_oper_set(cal: &Calibration, oper_set: &Vec<Operator>) -> bool {
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let accum = oper_set
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.iter()
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.zip(cal.numbers.iter().skip(1))
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.fold(cal.numbers[0], |accum, (oper, val)| oper.exec(accum, *val));
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if accum == cal.result {
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true
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} else {
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false
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}
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}
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fn possible(&self, operators: &[Operator]) -> u64 {
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let operator_sets = Calibrations::make_operator_sets(operators, self.longest_cal);
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self.cals
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.par_iter()
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.map(|cal| {
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let n_opers = cal.numbers.len() - 1;
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let tl = ThreadLocal::new();
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if operator_sets[n_opers]
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.par_iter()
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.find_any(|oper_set| Self::check_oper_set(&cal, &oper_set))
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.is_some()
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{
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let cal_local = tl.get_or(|| cal.clone());
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return cal_local.result;
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}
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0
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})
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.sum()
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}
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}
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@ -88,56 +136,15 @@ impl<T: BufRead> From<Lines<T>> for Calibrations {
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fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
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let cals = Calibrations::from(input);
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// println!("{:?}", cals);
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let mut sum = 0;
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let operators = [Operator::Add, Operator::Multiply];
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for cal in &cals.cals {
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let n_opers = cal.numbers.len() - 1;
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// println!("CAL: {:?} (opers: {})", cal, n_opers);
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for oper_set in std::iter::repeat_n(operators.iter(), n_opers).multi_cartesian_product() {
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// println!("operator set: {:?}", oper_set);
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let mut accum = cal.numbers[0];
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for (i, oper) in oper_set.iter().enumerate() {
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// println!("Testing {} {:?} {}", accum, oper, cal.numbers[i+1]);
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accum = oper.exec(accum, cal.numbers[i + 1]);
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}
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if accum == cal.result {
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sum += cal.result;
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// println!("Matched!");
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break;
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}
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}
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// println!("NO MATCHES");
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}
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sum
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cals.possible(&operators)
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}
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// PROBLEM 2 solution
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fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
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let cals = Calibrations::from(input);
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let mut sum = 0;
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let operators = [Operator::Add, Operator::Multiply, Operator::Concatenate];
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for cal in &cals.cals {
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let n_opers = cal.numbers.len() - 1;
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// println!("CAL: {:?} (opers: {})", cal, n_opers);
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for oper_set in std::iter::repeat_n(operators.iter(), n_opers).multi_cartesian_product() {
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// println!("operator set: {:?}", oper_set);
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let mut accum = cal.numbers[0];
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for (i, oper) in oper_set.iter().enumerate() {
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// println!("Testing {} {:?} {}", accum, oper, cal.numbers[i+1]);
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accum = oper.exec(accum, cal.numbers[i + 1]);
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}
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if accum == cal.result {
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sum += cal.result;
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// println!("Matched!");
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break;
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}
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}
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// println!("NO MATCHES");
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}
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sum
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cals.possible(&operators)
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}
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#[cfg(test)]
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