Day 3 part 1
This commit is contained in:
parent
8fe3e93bd6
commit
e54d9297ff
91
Cargo.lock
generated
91
Cargo.lock
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@ -1,4 +1,95 @@
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[[package]]
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name = "advent-of-code-2018"
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version = "0.1.0"
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dependencies = [
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"regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "aho-corasick"
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version = "0.6.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "cfg-if"
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version = "0.1.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "lazy_static"
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version = "1.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "libc"
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version = "0.2.45"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "memchr"
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version = "2.1.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
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"version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex"
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version = "1.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
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"memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
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"thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.6.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "thread_local"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "ucd-util"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "utf8-ranges"
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version = "1.0.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "version_check"
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version = "0.1.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e9a933f4e58658d7b12defcf96dc5c720f20832deebe3e0a19efd3b6aaeeb9e"
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"checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
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"checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
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"checksum libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)" = "2d2857ec59fadc0773853c664d2d18e7198e83883e7060b63c924cb077bd5c74"
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"checksum memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "db4c41318937f6e76648f42826b1d9ade5c09cafb5aef7e351240a70f39206e9"
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"checksum regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37e7cbbd370869ce2e8dff25c7018702d10b21a20ef7135316f8daecd6c25b7f"
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"checksum regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4e47a2ed29da7a9e1960e1639e7a982e6edc6d49be308a3b02daf511504a16d1"
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"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
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"checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
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"checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
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"checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
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@ -5,3 +5,4 @@ authors = ["Tyler Hallada <tyler@hallada.net>"]
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edition = "2018"
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[dependencies]
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regex = "1"
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1401
inputs/3.txt
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1401
inputs/3.txt
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File diff suppressed because it is too large
Load Diff
3
inputs/3_test.txt
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3
inputs/3_test.txt
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@ -0,0 +1,3 @@
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#1 @ 1,3: 4x4
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#2 @ 3,1: 4x4
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#3 @ 5,5: 2x2
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3
inputs/3_test_malformed.txt
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3
inputs/3_test_malformed.txt
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#1 @ 1,3: 4x4
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#2 @ 3,1: 4x4
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#3 @ 5,5: 2x2
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164
src/day3.rs
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164
src/day3.rs
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extern crate regex;
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use std::error::Error;
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use std::fs::File;
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use std::io::{BufRead, BufReader};
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use std::fmt;
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use std::collections::HashMap;
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use regex::{Regex, Captures};
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const INPUT: &str = "inputs/3.txt";
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#[derive(Debug, PartialEq)]
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struct Claim {
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id: u32,
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left: u32,
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top: u32,
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width: u32,
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height: u32,
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}
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#[derive(Debug, PartialEq, Eq, Hash)]
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struct Point {
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x: u32,
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y: u32,
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}
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#[derive(Debug, Clone, PartialEq)]
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struct MalformedClaim {
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details: String
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}
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impl MalformedClaim {
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fn new(msg: &str) -> MalformedClaim {
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MalformedClaim{ details: msg.to_string() }
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}
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}
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impl fmt::Display for MalformedClaim {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.details)
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}
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}
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impl Error for MalformedClaim {
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fn description(&self) -> &str {
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&self.details
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}
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}
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pub fn solve_part1() -> Result<u32, Box<Error>> {
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Ok(count_overlapping_claimed_points(read_claims(INPUT)?))
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}
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fn count_overlapping_claimed_points(claims: Vec<Claim>) -> u32 {
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let mut claimed_points: HashMap<Point, u32> = HashMap::new();
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for claim in claims {
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for point in list_points_in_claim(claim) {
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let current_point = claimed_points.get(&point).unwrap_or(&0);
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claimed_points.insert(point, current_point + 1);
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}
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}
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return claimed_points.values().fold(0, |acc, claims| {
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if claims > &1 {
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return acc + 1
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}
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acc
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})
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}
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fn list_points_in_claim(claim: Claim) -> Vec<Point> {
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let mut points = Vec::new();
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for x in 0..claim.width {
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for y in 0..claim.height {
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points.push(Point { x: claim.left + x, y: claim.top + y });
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}
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}
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points
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}
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fn read_claims(filename: &str) -> Result<Vec<Claim>, Box<Error>> {
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let mut claims: Vec<Claim> = Vec::new();
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let claim_regex =
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Regex::new(r"#(?P<id>\d+) @ (?P<left>\d+),(?P<top>\d+): (?P<width>\d+)x(?P<height>\d+)")?;
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let file = File::open(filename)?;
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for line in BufReader::new(file).lines() {
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match claim_regex.captures(&line?) {
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Some(captures) => {
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let claim = Claim {
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id: get_captured_field(&captures, "id")?,
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left: get_captured_field(&captures, "left")?,
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top: get_captured_field(&captures, "top")?,
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width: get_captured_field(&captures, "width")?,
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height: get_captured_field(&captures, "height")?,
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};
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claims.push(claim);
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},
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None => return Err(Box::new(MalformedClaim {
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details: "Malformed claim line, no fields could be found".to_string()
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})),
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};
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}
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Ok(claims)
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}
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fn get_captured_field(captures: &Captures, field: &str) -> Result<u32, Box<Error>> {
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match captures.name(field) {
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Some(capture) => Ok(capture.as_str().parse()?),
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None => return Err(Box::new(MalformedClaim {
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details: format!("Malformed claim line, field {} could not be found", field)
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}))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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const TEST_INPUT: &str = "inputs/3_test.txt";
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const TEST_INPUT_MALFORMED: &str = "inputs/3_test_malformed.txt";
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#[test]
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fn reads_claims_file() {
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assert_eq!(read_claims(TEST_INPUT).unwrap(), vec![
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Claim { id: 1, left: 1, top: 3, width: 4, height: 4 },
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Claim { id: 2, left: 3, top: 1, width: 4, height: 4 },
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Claim { id: 3, left: 5, top: 5, width: 2, height: 2 },
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]);
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}
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#[test]
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fn errors_on_malformed_claims_file() {
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match read_claims(TEST_INPUT_MALFORMED) {
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Ok(_) => assert!(false, "read_claims should have returned an error"),
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Err(err) => assert_eq!(
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(*err).description(),
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"Malformed claim line, no fields could be found".to_string(),
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),
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}
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}
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#[test]
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fn lists_points_in_claim() {
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assert_eq!(list_points_in_claim(Claim { id: 1, left: 0, top: 0, width: 2, height: 2 }),
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vec![
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Point { x: 0, y: 0 },
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Point { x: 0, y: 1 },
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Point { x: 1, y: 0 },
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Point { x: 1, y: 1 },
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]
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)
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}
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#[test]
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fn counts_overlapping_claimed_points() {
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let test_claims = vec![
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Claim { id: 1, left: 1, top: 3, width: 4, height: 4 },
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Claim { id: 2, left: 3, top: 1, width: 4, height: 4 },
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Claim { id: 3, left: 5, top: 5, width: 2, height: 2 },
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];
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assert_eq!(count_overlapping_claimed_points(test_claims), 4);
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}
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}
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@ -1,5 +1,6 @@
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mod day1;
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mod day2;
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mod day3;
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fn main() {
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println!("Day 1:");
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@ -8,4 +9,6 @@ fn main() {
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println!("Day 2:");
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println!("{}", day2::solve_part1().unwrap());
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println!("{}", day2::solve_part2().unwrap().unwrap());
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println!("Day 3:");
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println!("{}", day3::solve_part1().unwrap());
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}
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