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Day 1 2018

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Wesley Moore 2018-12-02 09:53:05 +11:00
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2018/Cargo.lock generated Normal file
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[[package]]
name = "advent-of-code"
version = "0.1.0"

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[package]
name = "advent-of-code"
version = "0.1.0"
authors = ["Wesley Moore <wes@wezm.net>"]
[dependencies]

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use std::io::{self, BufRead, BufReader};
use std::fs::{self, File};
use std::collections::HashSet;
const INPUT: &str = "input/2018/day1.txt";
fn main() {
part1();
part2();
}
fn part1() {
let input = File::open(INPUT).expect("input");
let input = BufReader::new(input);
let frequency = input.lines().map(|line| {
line.unwrap().parse::<i32>().expect("unable to parse line")
}).sum::<i32>();
println!("{}", frequency);
}
fn part2() {
let input = fs::read_to_string(INPUT).expect("input");
let mut frequency = 0;
let mut seen = HashSet::new();
for line in input.lines().cycle() {
let drift = line.parse::<i32>().expect("unable to parse line");
frequency += drift;
if !seen.insert(frequency) {
break;
}
}
println!("{}", frequency);
}