2018/01

2018-12-01 10:18:42 +01:00
parent 1ed2085a2c
commit f530d51460
4 changed files with 1032 additions and 0 deletions
--- a/2018/01/Cargo.lock
+++ b/2018/01/Cargo.lock
@@ -0,0 +1,4 @@
 [[package]]
 name = "day-01"
 version = "0.1.0"
--- a/2018/01/Cargo.toml
+++ b/2018/01/Cargo.toml
@@ -0,0 +1,6 @@
 [package]
 name = "day-01"
 version = "0.1.0"
 authors = ["Anders Olsson <anders.e.olsson@gmail.com>"]
 [dependencies]
--- a/2018/01/input.txt
+++ b/2018/01/input.txt
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--- a/2018/01/src/main.rs
+++ b/2018/01/src/main.rs
@@ -0,0 +1,32 @@
 use std::collections::HashSet;
 use std::io::{self, BufRead};
 fn main() {
    let stdin = io::stdin();
    let changes = stdin
        .lock()
        .lines()
        .filter_map(Result::ok)
        .map(|line| line.parse::<i32>().expect("failed to parse delta"))
        .collect::<Vec<_>>();
    println!("part.one={}", changes.iter().sum::<i32>());
    let mut seen = HashSet::new();
    let mut frequency = 0;
    'iterate: loop {
        for change in &changes {
            frequency += change;
            if seen.contains(&frequency) {
                break 'iterate;
            }
            seen.insert(frequency);
        }
    }
    println!("part.two={}", frequency);
 }