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Complete day 5 #3

Merged
tlater merged 2 commits from tlater/day-5 into master 2020-12-08 00:54:38 +00:00
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1
day-5/.gitignore vendored Normal file
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/target/

78
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "day-5"
version = "0.1.0"
dependencies = [
"indoc",
]
[[package]]
name = "indoc"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
dependencies = [
"indoc-impl",
"proc-macro-hack",
]
[[package]]
name = "indoc-impl"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
dependencies = [
"proc-macro-hack",
"proc-macro2",
"quote",
"syn",
"unindent",
]
[[package]]
name = "proc-macro-hack"
version = "0.5.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
[[package]]
name = "proc-macro2"
version = "1.0.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
dependencies = [
"unicode-xid",
]
[[package]]
name = "quote"
version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
dependencies = [
"proc-macro2",
]
[[package]]
name = "syn"
version = "1.0.53"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8833e20724c24de12bbaba5ad230ea61c3eafb05b881c7c9d3cfe8638b187e68"
dependencies = [
"proc-macro2",
"quote",
"unicode-xid",
]
[[package]]
name = "unicode-xid"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
[[package]]
name = "unindent"
version = "0.1.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"

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[package]
name = "day-5"
version = "0.1.0"
authors = ["Tristan Daniël Maat <tm@tlater.net>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
indoc = "0.3"

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use std::fs;
type SeatCode = [char; 10];
fn main() -> Result<(), Box<dyn std::error::Error>> {
let input = fs::read_to_string("input")?;
// Part 1
let max_id: Result<usize, String> = input
.lines()
.map(|code| {
let (row, col) = find_seat(parse_seatcode(code)?);
Ok(row * 8 + col)
})
.max()
.ok_or("No seat codes set")?;
println!("{}", max_id?);
// Part 2
let mut ids = input
.lines()
.map(|code| {
let (row, col) = find_seat(parse_seatcode(code)?);
Ok(row * 8 + col)
})
.collect::<Result<Vec<usize>, String>>()?;
ids.sort();
let mut previous = ids[0];
for id in &ids[1..] {
if id - 1 != previous {
println!("{}", id);
break;
} else {
previous = *id;
}
}
Ok(())
}
fn parse_seatcode(input: &str) -> Result<SeatCode, String> {
let mut output = ['0'; 10];
for (i, c) in input.chars().enumerate() {
if i > 10 {
Err(format!("Seat code too long: '{}'", input))?;
}
if !['F', 'B', 'L', 'R'].iter().any(|valid| &c != valid) {
Err(format!("Invalid character in seat code: '{}'", input))?;
}
output[i] = c;
}
Ok(output)
}
fn find_seat(code: SeatCode) -> (usize, usize) {
let midpoint = |(start, end): (usize, usize)| (start + end) / 2;
let binary_follow = |range: (usize, usize), direction: &char| match direction {
'F' | 'L' => (range.0, midpoint(range)),
'B' | 'R' => (midpoint(range) + 1, range.1),
_ => unreachable!("We already checked all characters are valid"),
};
let row = code[..7].iter().fold((0, 127), binary_follow).0;
let col = code[7..].iter().fold((0, 7), binary_follow).0;
(row, col)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
let input = "FBFBBFFRLR";
let seat = find_seat(parse_seatcode(input)?);
assert_eq!(seat, (44, 5));
Ok(())
}
#[test]
fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
let input = "BFFFBBFRRR";
let seat = find_seat(parse_seatcode(input)?);
assert_eq!(seat, (70, 7));
Ok(())
}
#[test]
fn test_simple3() -> Result<(), Box<dyn std::error::Error>> {
let input = "FFFBBBFRRR";
let seat = find_seat(parse_seatcode(input)?);
assert_eq!(seat, (14, 7));
Ok(())
}
#[test]
fn test_simple4() -> Result<(), Box<dyn std::error::Error>> {
let input = "BBFFBBFRLL";
let seat = find_seat(parse_seatcode(input)?);
assert_eq!(seat, (102, 4));
Ok(())
}
}