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
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users/riking/adventofcode-2020/.gitignore
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users/riking/adventofcode-2020/.gitignore
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*/target
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*/input.txt
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users/riking/adventofcode-2020/day01/Cargo.lock
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users/riking/adventofcode-2020/day01/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "anyhow"
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version = "1.0.34"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "bf8dcb5b4bbaa28653b647d8c77bd4ed40183b48882e130c1f1ffb73de069fd7"
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[[package]]
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name = "day01"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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]
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users/riking/adventofcode-2020/day01/Cargo.toml
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users/riking/adventofcode-2020/day01/Cargo.toml
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[package]
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name = "day01"
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version = "0.1.0"
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authors = ["Kane York <kanepyork@gmail.com>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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anyhow = "1.0.34"
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users/riking/adventofcode-2020/day01/default.nix
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users/riking/adventofcode-2020/day01/default.nix
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{ depot, ... }:
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with depot.third_party;
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naersk.buildPackage {
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src = ./.;
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buildInputs = [];
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doCheck = true;
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}
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users/riking/adventofcode-2020/day01/src/main.rs
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users/riking/adventofcode-2020/day01/src/main.rs
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use anyhow::anyhow;
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use std::fs::File;
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use std::io::prelude::*;
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use std::io::BufReader;
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const PART_2: bool = true;
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fn day01(is_part2: bool, numbers: &Vec<i64>) -> Result<String, anyhow::Error> {
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//println!("{:?}", numbers);
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for n1 in numbers.iter() {
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for n2 in numbers.iter() {
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if is_part2 {
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for n3 in numbers.iter() {
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if n1 + n2 + n3 == 2020 {
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return Ok((n1 * n2 * n3).to_string());
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}
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}
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} else {
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if n1 + n2 == 2020 {
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return Ok((n1 * n2).to_string());
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}
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}
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}
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}
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Err(anyhow!("no solution found"))
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}
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fn parse(filename: &str) -> Result<Vec<i64>, anyhow::Error> {
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let f = File::open(filename)?;
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let mut reader = BufReader::new(f);
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let mut values = Vec::<i64>::new();
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let mut line = String::new();
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loop {
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line.clear();
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reader.read_line(&mut line)?;
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let trimmed_line = line.trim();
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if trimmed_line.is_empty() {
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break;
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}
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values.push(trimmed_line.parse()?);
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}
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Ok(values)
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}
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fn main() -> anyhow::Result<()> {
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let args: Vec<String> = std::env::args().collect();
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//println!("{:?}", args);
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if args.len() != 2 {
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return Err(anyhow!("usage: day01 input_file"));
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}
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let filename = args.into_iter().skip(1).next().expect("args len == 1");
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let numbers = parse(&filename)?;
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println!("{}", day01(PART_2, &numbers)?);
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::day01;
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#[test]
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fn test_part1() {
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let vec = vec![1721, 979, 366, 299, 675, 1456];
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let result = day01(false, &vec).unwrap();
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assert_eq!(result, 514579.to_string());
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}
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#[test]
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fn test_part2() {
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let vec = vec![1721, 979, 366, 299, 675, 1456];
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let result = day01(true, &vec).unwrap();
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assert_eq!(result, 241861950.to_string());
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}
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}
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