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day1.rs
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day1.rs
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//! [Day 1: Report Repair](https://adventofcode.com/2020/day/1)
// use std::collections::{HashMap,HashSet};
struct Puzzle {
expenses: Vec<u64>,
}
impl Puzzle {
fn new() -> Puzzle {
Puzzle { expenses: vec![] }
}
/// Get the puzzle input.
fn configure(&mut self, path: &str) {
let data = std::fs::read_to_string(path).unwrap();
self.expenses = data.lines().map(|s| s.parse().unwrap()).collect();
}
/// Solve part one.
fn part1(&self) -> u64 {
for i in &self.expenses {
for j in &self.expenses {
if i + j == 2020 {
return i * j;
}
}
}
0
}
/// Solve part two.
fn part2(&self) -> u64 {
for i in &self.expenses {
for j in &self.expenses {
for k in &self.expenses {
if i + j + k == 2020 {
return i * j * k;
}
}
}
}
0
}
}
fn main() {
let args = aoc::parse_args();
let mut puzzle = Puzzle::new();
puzzle.configure(args.path.as_str());
println!("{}", puzzle.part1());
println!("{}", puzzle.part2());
}
/// Test from puzzle input
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test01() {
let mut puzzle = Puzzle::new();
puzzle.configure("test.txt");
assert_eq!(puzzle.part1(), 514579);
}
#[test]
fn test02() {
let mut puzzle = Puzzle::new();
puzzle.configure("test.txt");
assert_eq!(puzzle.part2(), 241861950);
}
}