From cfd9b4f2ad1a09bedf7f764f84448a61faab54a3 Mon Sep 17 00:00:00 2001 From: Justin Wernick Date: Tue, 19 Apr 2022 20:26:02 +0200 Subject: Refile for merging repos --- 2018/src/bin/day_1.rs | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 2018/src/bin/day_1.rs (limited to '2018/src/bin/day_1.rs') diff --git a/2018/src/bin/day_1.rs b/2018/src/bin/day_1.rs new file mode 100644 index 0000000..4693579 --- /dev/null +++ b/2018/src/bin/day_1.rs @@ -0,0 +1,32 @@ +extern crate advent_of_code_2018; +use advent_of_code_2018::*; + +extern crate im_rc; + +use std::error::Error; +use std::path::PathBuf; + +use im_rc::HashSet; + +// cargo watch -cs "cargo run --release --bin day_1" + +fn main() -> Result<(), Box> { + let input = read_file(&PathBuf::from("inputs/1.txt"))?; + let input_ints: Vec = input.iter().map(|str| str.parse::().unwrap()).collect(); + + println!("Input: {:?}", input_ints); + + let sum: i32 = input_ints.iter().sum(); + println!("Sum: {}", sum); + + let first_repeat = input_ints.iter().cycle().try_fold((0, HashSet::new()), |(acc, seen), &i| { + if seen.contains(&acc) { + Err(acc) + } else { + Ok((acc + i, seen.update(acc))) + } + }).err().unwrap(); + println!("First repeat: {}", first_repeat); + + Ok(()) +} -- cgit v1.2.3