From 426ea006366818c4da35f69c08e1de4fdcf89874 Mon Sep 17 00:00:00 2001 From: Antoine Martin Date: Fri, 18 Dec 2020 15:22:42 +0100 Subject: [PATCH] 2020: day18: part 1 --- Cargo.lock | 80 +++++++++ aoc2020/Cargo.toml | 1 + aoc2020/input/day18.txt | 373 ++++++++++++++++++++++++++++++++++++++++ aoc2020/src/day18.rs | 120 +++++++++++++ aoc2020/src/lib.rs | 1 + aoc2020/src/main.rs | 2 + 6 files changed, 577 insertions(+) create mode 100644 aoc2020/input/day18.txt create mode 100644 aoc2020/src/day18.rs diff --git a/Cargo.lock b/Cargo.lock index 52fce8e..6af7b11 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -69,6 +69,7 @@ dependencies = [ "anyhow", "aoc", "itertools", + "nom", ] [[package]] @@ -79,6 +80,12 @@ dependencies = [ "criterion", ] +[[package]] +name = "arrayvec" +version = "0.5.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b" + [[package]] name = "atty" version = "0.2.14" @@ -102,6 +109,18 @@ version = "1.2.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693" +[[package]] +name = "bitvec" +version = "0.19.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a7ba35e9565969edb811639dbebfe34edc0368e472c5018474c8eb2543397f81" +dependencies = [ + "funty", + "radium", + "tap", + "wyz", +] + [[package]] name = "block-buffer" version = "0.7.3" @@ -310,6 +329,12 @@ version = "1.6.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457" +[[package]] +name = "funty" +version = "1.0.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "0ba62103ce691c2fd80fbae2213dfdda9ce60804973ac6b6e97de818ea7f52c8" + [[package]] name = "generic-array" version = "0.12.3" @@ -364,6 +389,19 @@ version = "1.4.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646" +[[package]] +name = "lexical-core" +version = "0.7.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "db65c6da02e61f55dae90a0ae427b2a5f6b3e8db09f58d10efab23af92592616" +dependencies = [ + "arrayvec", + "bitflags", + "cfg-if 0.1.10", + "ryu", + "static_assertions", +] + [[package]] name = "libc" version = "0.2.81" @@ -405,6 +443,18 @@ dependencies = [ "autocfg", ] +[[package]] +name = "nom" +version = "6.0.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "88034cfd6b4a0d54dd14f4a507eceee36c0b70e5a02236c4e4df571102be17f0" +dependencies = [ + "bitvec", + "lexical-core", + "memchr", + "version_check", +] + [[package]] name = "num-traits" version = "0.2.14" @@ -466,6 +516,12 @@ dependencies = [ "proc-macro2", ] +[[package]] +name = "radium" +version = "0.5.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "941ba9d78d8e2f7ce474c015eea4d9c6d25b6a3327f9832ee29a4de27f91bbb8" + [[package]] name = "rayon" version = "1.5.0" @@ -598,6 +654,12 @@ dependencies = [ "serde", ] +[[package]] +name = "static_assertions" +version = "1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f" + [[package]] name = "syn" version = "1.0.54" @@ -609,6 +671,12 @@ dependencies = [ "unicode-xid", ] +[[package]] +name = "tap" +version = "1.0.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "36474e732d1affd3a6ed582781b3683df3d0563714c59c39591e8ff707cf078e" + [[package]] name = "textwrap" version = "0.11.0" @@ -646,6 +714,12 @@ version = "0.2.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564" +[[package]] +name = "version_check" +version = "0.9.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed" + [[package]] name = "walkdir" version = "2.3.1" @@ -751,3 +825,9 @@ name = "winapi-x86_64-pc-windows-gnu" version = "0.4.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" + +[[package]] +name = "wyz" +version = "0.2.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214" diff --git a/aoc2020/Cargo.toml b/aoc2020/Cargo.toml index a5e88e4..d1c3b99 100644 --- a/aoc2020/Cargo.toml +++ b/aoc2020/Cargo.toml @@ -10,6 +10,7 @@ edition = "2018" aoc = { path = "../aoc" } anyhow = "1.0" itertools = "0.9" +nom = "6.0" [lib] path = "src/lib.rs" diff --git a/aoc2020/input/day18.txt b/aoc2020/input/day18.txt new file mode 100644 index 0000000..ed81407 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9 + 8 * 9 + 3 * 3)) * 5 +(3 * 5 * (4 + 2 + 8 + 4 + 7) + 7 * 7) * (6 * 7 + 9 * 7 + 7 + 9) diff --git a/aoc2020/src/day18.rs b/aoc2020/src/day18.rs new file mode 100644 index 0000000..1eb4531 --- /dev/null +++ b/aoc2020/src/day18.rs @@ -0,0 +1,120 @@ +use std::fmt::Write; + +use anyhow::{anyhow, Result}; + +use nom::{ + branch::alt, + bytes::complete::take_while1, + character::complete::{char, one_of}, + combinator::{eof, map_res}, + multi::fold_many0, + sequence::{delimited, pair, terminated}, + IResult, Parser, +}; + +const INPUT: &str = include_str!("../input/day18.txt"); + +pub fn run() -> Result { + let mut res = String::with_capacity(128); + + writeln!(res, "part 1: {}", part1(INPUT)?)?; + + Ok(res) +} + +fn part1(input: &str) -> Result { + input + .lines() + .map(|line| line.parse::().map(|e| e.eval())) + .sum() +} + +#[derive(Debug, Clone, Copy)] +enum Operator { + Addition, + Multiplication, +} + +#[derive(Debug, Clone)] +enum Expr { + Num(u64), + Op(Box, Operator, Box), +} + +impl Expr { + fn eval(&self) -> u64 { + match self { + Self::Num(val) => *val, + Self::Op(lhs, op, rhs) => match op { + Operator::Addition => lhs.eval() + rhs.eval(), + Operator::Multiplication => lhs.eval() * rhs.eval(), + }, + } + } +} + +fn operator(input: &str) -> IResult<&str, Operator> { + one_of("+*") + .map(|op| match op { + '+' => Operator::Addition, + '*' => Operator::Multiplication, + _ => unreachable!(), + }) + .parse(input) +} + +fn operator_expr(input: &str) -> IResult<&str, Expr> { + let (i, first_term) = term(input)?; + + fold_many0( + pair(delimited(char(' '), operator, char(' ')), term), + first_term, + |acc, (op, val)| Expr::Op(Box::new(acc), op, Box::new(val)), + )(i) +} + +fn num(input: &str) -> IResult<&str, Expr> { + map_res(take_while1(|c: char| c.is_digit(10)), |res: &str| { + res.parse().map(Expr::Num) + })(input) +} + +fn term(input: &str) -> IResult<&str, Expr> { + alt((delimited(char('('), expr, char(')')), num))(input) +} + +fn expr(input: &str) -> IResult<&str, Expr> { + alt((operator_expr, term))(input) +} + +impl std::str::FromStr for Expr { + type Err = anyhow::Error; + + fn from_str(s: &str) -> Result { + let (_, res) = terminated(expr, eof)(s).map_err(|_| anyhow!("couldn't parse expr"))?; + + Ok(res) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn part1_provided() { + let tests = &[ + ("1 + 2 * 3 + 4 * 5 + 6", 71), + ("1 + (2 * 3) + (4 * (5 + 6))", 51), + ("2 * 3 + (4 * 5)", 26), + ("5 + (8 * 3 + 9 + 3 * 4 * 3)", 437), + ("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))", 12240), + ("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2", 13632), + ]; + + for (expr, expected) in tests { + let expr: Expr = expr.parse().unwrap(); + assert_eq!(expr.eval(), *expected); + } + } +} diff --git a/aoc2020/src/lib.rs b/aoc2020/src/lib.rs index cf569f2..cefe9c3 100644 --- a/aoc2020/src/lib.rs +++ b/aoc2020/src/lib.rs @@ -17,3 +17,4 @@ pub mod day14; pub mod day15; pub mod day16; pub mod day17; +pub mod day18; diff --git a/aoc2020/src/main.rs b/aoc2020/src/main.rs index 9c35ca5..ffcbda9 100644 --- a/aoc2020/src/main.rs +++ b/aoc2020/src/main.rs @@ -19,6 +19,7 @@ use aoc2020::day14; use aoc2020::day15; use aoc2020::day16; use aoc2020::day17; +use aoc2020::day18; fn main() -> Result<()> { let days: &[DayFunc] = &[ @@ -39,6 +40,7 @@ fn main() -> Result<()> { day15::run, day16::run, day17::run, + day18::run, ]; aoc::run(days)