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use aoc2021::parsers;
use nom::{character::complete::line_ending, combinator::map, multi::separated_list1, IResult};
use std::fs;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let input = fs::read_to_string("inputs/day_1.txt")?;
let sonar_scan = parse_sonar_scan(&input).unwrap().1;
{
let mut simple_increase_counter = DepthIncreaseCounter::default();
for (depth, next_depth) in sonar_scan.iter().zip(sonar_scan.iter().skip(1)) {
if next_depth > depth {
simple_increase_counter.increment();
}
}
dbg!(simple_increase_counter);
}
{
let windowed_sonar_scan = sonar_scan
.iter()
.zip(sonar_scan.iter().skip(1))
.zip(sonar_scan.iter().skip(2))
.map(|((depth1, depth2), depth3)| ThreeDepthWindowSum::new([*depth1, *depth2, *depth3]))
.collect::<Vec<_>>();
let mut windowed_increase_counter = DepthIncreaseCounter::default();
for (depth, next_depth) in windowed_sonar_scan
.iter()
.zip(windowed_sonar_scan.iter().skip(1))
{
if next_depth > depth {
windowed_increase_counter.increment();
}
}
dbg!(windowed_increase_counter);
}
Ok(())
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
struct Depth(u64);
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
struct ThreeDepthWindowSum(u64);
impl ThreeDepthWindowSum {
fn new(depths: [Depth; 3]) -> ThreeDepthWindowSum {
ThreeDepthWindowSum(depths.into_iter().map(|d| d.0).sum())
}
}
fn parse_sonar_scan(input: &str) -> IResult<&str, Vec<Depth>> {
separated_list1(line_ending, parse_depth)(input)
}
fn parse_depth(input: &str) -> IResult<&str, Depth> {
map(parsers::u64, |number| Depth(number))(input)
}
#[derive(Default, Debug)]
struct DepthIncreaseCounter(u64);
impl DepthIncreaseCounter {
fn increment(&mut self) {
self.0 += 1;
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parses_a_depth() {
assert_eq!(parse_depth("96\n"), Ok(("\n", Depth(96))));
}
}
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