feat(u/riking/aoc/day01): add day01 solution

Tests with the puzzle's sample inputs are included.

Change-Id: I32cd59b9e3894bde3d67ebdc3a977961b17bdb49
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2223
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Tested-by: BuildkiteCI
This commit is contained in:
Kane York 2020-12-01 23:10:00 -08:00 committed by kanepyork
parent 8ae4854de8
commit 50b32531ee
5 changed files with 121 additions and 0 deletions

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*/target
*/input.txt

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "anyhow"
version = "1.0.34"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bf8dcb5b4bbaa28653b647d8c77bd4ed40183b48882e130c1f1ffb73de069fd7"
[[package]]
name = "day01"
version = "0.1.0"
dependencies = [
"anyhow",
]

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[package]
name = "day01"
version = "0.1.0"
authors = ["Kane York <kanepyork@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0.34"

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{ depot, ... }:
with depot.third_party;
naersk.buildPackage {
src = ./.;
buildInputs = [];
doCheck = true;
}

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use anyhow::anyhow;
use std::fs::File;
use std::io::prelude::*;
use std::io::BufReader;
const PART_2: bool = true;
fn day01(is_part2: bool, numbers: &Vec<i64>) -> Result<String, anyhow::Error> {
//println!("{:?}", numbers);
for n1 in numbers.iter() {
for n2 in numbers.iter() {
if is_part2 {
for n3 in numbers.iter() {
if n1 + n2 + n3 == 2020 {
return Ok((n1 * n2 * n3).to_string());
}
}
} else {
if n1 + n2 == 2020 {
return Ok((n1 * n2).to_string());
}
}
}
}
Err(anyhow!("no solution found"))
}
fn parse(filename: &str) -> Result<Vec<i64>, anyhow::Error> {
let f = File::open(filename)?;
let mut reader = BufReader::new(f);
let mut values = Vec::<i64>::new();
let mut line = String::new();
loop {
line.clear();
reader.read_line(&mut line)?;
let trimmed_line = line.trim();
if trimmed_line.is_empty() {
break;
}
values.push(trimmed_line.parse()?);
}
Ok(values)
}
fn main() -> anyhow::Result<()> {
let args: Vec<String> = std::env::args().collect();
//println!("{:?}", args);
if args.len() != 2 {
return Err(anyhow!("usage: day01 input_file"));
}
let filename = args.into_iter().skip(1).next().expect("args len == 1");
let numbers = parse(&filename)?;
println!("{}", day01(PART_2, &numbers)?);
Ok(())
}
#[cfg(test)]
mod tests {
use super::day01;
#[test]
fn test_part1() {
let vec = vec![1721, 979, 366, 299, 675, 1456];
let result = day01(false, &vec).unwrap();
assert_eq!(result, 514579.to_string());
}
#[test]
fn test_part2() {
let vec = vec![1721, 979, 366, 299, 675, 1456];
let result = day01(true, &vec).unwrap();
assert_eq!(result, 241861950.to_string());
}
}